Emergency Planning and Community Right-To-Know Section 313: Guidance for Reporting Aqueous Ammonia

&EPA
United States,
Environmental Protection
Agency
Office of Pollution
Prevention and Toxics
Washington, DC 20460
July 1995
EPA 745-R-95
EMERGENCY PLANNING AND
COMMUNITY RIGHT-TO-KNOW
SECTION 313
Guidance for Reporting Aqueous Ammonia
Section 313 of the Emergency Planning and Community Right-to-Knbw Act of 1986
(EPCRA) requires certain facilities manufacturing, processing, or otherwise using listed
toxic chemicals to report their environmental releases of such chemicals annually.
Beginning with the 1991 reporting year, such facilities also must report pollution prevention
and recycling data for such chemicals, pursuant to section 6607 of the Pollution Prevention
Act, 42 U.S.C. 13106. When enacted, EPCRA section 313 established an initial list of
toxic chemicals that was comprised of more than 300 chemicals and 20 chemical categories.
EPCRA section 313(d) authorizes EPA to add chemicals to or delete chemicals from the
list, and sets forth criteria for these actions.
• ' •• ' "CONTENTS ......''• . " • .

Section 1. Introduction . . ; . . . ..... ....'." 2
1.1 Who Must Report . . . 2
1.2 Thresholds .... . . 2
1.3 Chemical Sources of Aqueous Ammonia . . . . 3
1.4 De Minimis Concentrations 3

Section 2. Guidance for Reporting Aqueous Ammonia . . ; 4
2.1 Detennining Threshold and Release Quantities for Ammonia . 4'
2.2 Chemical Sources of Aqueous Ammbnia . 5
2.2.1 . Reporting Aqueous Ammonia Generated from Anhydrous
Ammonia in Water . . . . . ......... 5
2.2.2 Reporting Aqueous Ammonia Generated from the Dissociation of
Ammonium Salts (Other Than Ammonium Nitrate) ........ 6
2.2.3 Reporting Aqueous Ammonia Generated from the Dissociation of
.Ammonium Nitrate '.'... 7

Section 3. CAS Number List of Some Chemical Sources of Aqueous Ammonia 10

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                                 Section 1. Introduction
       On June 30,  1995 EPA finalized four actions in response to a petition received in
1989 to delete ammonium sulfate (solution) from the list of toxic chemicals subject to
reporting  under section 313 of the Emergency  Planning  and Community Right-to-Know Act
of 1986 (EPCRA), 42 U.S.C. 11001.  The four actions taken are summarized as follows: (1)
deleted ammonium sulfate (solution) from the  EPCRA section 313 list of toxic chemicals,
(2) required that threshold and release determinations for aqueous ammonia be based on 10
percent of the total aqueous ammonia present in aqueous solutions of ammonia,  (3)
modified  the ammonia listing by adding the following qualifier: ammonia (includes
anhydrous ammonia and aqueous  ammonia from water dissociable ammonium salts and
other sources; 10 percent of total  aqueous  ammonia is reportable under this listing), and (4)
deleted ammonium nitrate (solution) as a separately listed chemical on the EPCRA section
313  list of toxic chemicals. All actions are effective for the 1994 reporting year for reports
due  July 1, 1995, with the exception of the deletion of ammonium nitrate (solution) as  a
separately listed chemical, which  is  effective for the 1995 reporting year for reports due
July 1, 1996.  At the time that these actions were finalized, EPA indicated that the Agency
would develop, as appropriate, interpretations and guidance that the Agency determines  are
necessary to facilitate  accurate reporting for aqueous  ammonia.  This document constitutes
such guidance for reporting under the ammonia listing.

Section 1.1 Who Must Report

       A  plant, factory, or other facility is subject to the provisions of EPCRA section 313,
if it  meets all  three of the following criteria:

       •      It conducts manufacturing operations (is included in Standard Industrial
              Classification (SIC) codes 20 through 39); and

       •      It has  10 or more full-tune employees (or  the equivalent 20,000 hours per
              year);  and

       •      It manufactures,  imports, processes, or otherwise uses any of the toxic
              chemicals  listed on the EPCRA section 313 list in amounts greater than the
              "threshold" quantities  specified below.

Section 1.2 Thresholds

       Thresholds are specified amounts of toxic chemicals used during the calendar year
that  trigger reporting requirements.

       If a facility manufactures  or imports any of the listed toxic chemicals, the threshold
quantity will be:                                                                 ,

       •       25,000 pounds per toxic chemical or category over the calendar year.

                                  ,    • •    2 '

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be:.
If a facility processes any of the listed toxic chemicals, the threshold quantity, will
25,000 pounds per toxic chemical or category over the calendar year.
If a facility otherwise uses any of the listed toxic chemicals (without incorporating it
into any product or producing it at the facility), the threshold quantity is:

• 10,000 pounds per toxic chemical or category over the calendar year.
'Section 1.3 Chemical Sources of Aqueous Ammonia

If a facility manufactures, processes, or otherwise uses anhydrous ammonia or
aqueous ammonia, they must report under the ammonia listing. EPA is providing a table of
Chemical Abstract Service (CAS) numbers and chemical names to aid the regulated
community in determining whether they need to report under the ammonia listing for
aqueous ammonia. This table includes a list of water dissociable ammonium salts which, •
when placed in water, are a source of aqueous ammonia. The table contains only ;
commonly used ammonium salts and therefore is not exhaustive. If a facility manufactures;,
processes, or otherwise uses aqueous ammonia, regardless of its source, it must report under
the ammonia listing, even if the source of the aqueous ammonia is not listed in the table
provided in this document. s ,

Section 1.4 De Minimis Concentrations

The ammonia listing is subject to the one percent de minimis concentration. Thus, ,
solutions containing aqueous ammonia at a concentration in excess of one percent *of the 10
percent reportable under this listing should be factored into threshold and release
determinations. , , ,

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                 Section 2. Guidance for Reporting Aqueous Ammonia
       Note: for the purposes of reporting under the ammonia listing for aqueous ammonia,
water dissociable ammonium salts means that the ammonium ion dissociates from its
counterion when hi solution.

Section 2.1 Determining Threshold  and Release Quantities for Ammonia

       If a facility manufactures, processes,  or otherwise uses anhydrous ammonia, the
quantity applied towards threshold determinations for the ammonia listing is the total
quantity of the anhydrous ammonia manufactured, processed, or otherwise used.  The
quantity reported when calculating the amount of ammonia that is released, transferred,  or
otherwise managed is the total quantity of anhydrous ammonia released or transferred.

       If the facility manufactures, processes,  or otherwise  uses .anhydrous ammonia in
quantities that exceed the appropriate  threshold and subsequently  dissolves some or all of
the anhydrous ammonia in water, then the following applies:  1)  threshold determinations
are based on 100 percent of the  anhydrous ammonia simply 10 percent of aqueous
ammonia); 2) release, transfer, and other waste management quantities  for the  aqueous
ammonia are calculated as 10 percent of total ammonia; 3) release, transfer, ,and other waste
management quantities for the anhydrous ammonia are calculated as 100 percent of the
anhydrous  ammonia.

       If a facility manufactures, processes,  or otherwise uses aqueous ammonia, the
quantity applied toward threshold determinations for the ammonia listing is 10 percent of
the total quantity of the aqueous ammonia manufactured, processed, or otherwise used.'
The quantity reported when calculating  the amount of ammonia that is released, transferred,
or otherwise managed is 10 percent of the total quantity of aqueous ammonia released or
transferred.                                                       .

       If a facility dissolves a water dissociable ammonium salt in water that facility has
manufactured aqueous ammonia and 10 percent of the total aqueous ammonia
manufactured from these salts is to be included in manufacturing  threshold determinations
under the ammonia listing.

       If aqueous ammonia from water dissociable  ammonium salts is  processed  or
otherwise used, then 10 percent  of the total  aqueous ammonia is to be  included in all
processing  and otherwise use threshold  determinations under the ammonia listing.
  Example 1:  In a calendar year, a facility places 25,000 Ibs of anhydrous ammonia in
  water for processing and processes 25,000 Ibs of aqueous ammonia from an ammonium
  salt.  The facility must include all of the,25,000 Ibs of anhydrous ammonia in the
  determination of the processing threshold,  but only 10 percent (or 2,500 Ibs) of the
  aqueous ammonia from the ammonium salt in the processing  threshold determination.

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Total aqueous amnionia is the sum of the two forms of ammonia (un-ionized, NH3,
and ionized, NH/) present in aqueous solutions. A precise calculation of the weight of
total aqueous ammonia would require determining the ratio of the two forms of ammonia
present using the pH and temperature of the solution. The weight of total aqueous
ammonia can be more easily calculated t>y assuming that aqueous ammonia is comprised ;
entirely of the NH4+ form or the NH3 form. For the purpose of determining threshold and
release quantities under EPCRA section 313, EPA recommends that total aqueous ammonia
be calculated in terms of NH3 equivalents (i.e., for determining weights, assume total
ammonia is comprised entirely of the NH3 form). This method is simpler than using pH
and temperature data to determine the ratio of the two forms present and is consistent with
the presentation of total ammonia toxicity in a separate EPA document,. Ambient Water
Quality Criteria for Ammonia (EPA document #440/5-85-001, January 1985).

Section 2.2 Chemical Sources of Aqueous Ammonia

Aqueous ammonia may be generated in solution from a variety of sources that
include the release of anhydrous ammonia to water and the dissociation of ammonium salts
in water. Water dissociable ammonium salts are not reportable in their entirety under the
ammonia listing; these salts are reportable to the extent that they dissociate in water, and
only 10 percent of the total aqueous ammonia that results when these salts dissociate is
reportable. If these salts are not placed in water, they are not reportable.

If. ammonium salts are purchased neat or as solids by a facility, then "placed in water
by that facility, the facility is manufacturing aqueous ammonia.

Section 2.2.1 Reporting Aqueous Ammonia Generated from Anhydrous Ammonia in
Water . , .-..'.•;-'. • : • ' ' ' .. •'..'•."

If'the source of aqueous ammonia is anhydrous ammonia in water, total aqueous
ammonia (calculated in terms of NH3 equivalents) is equal to the quantity of anhydrous
ammonia manufactured, processed, or otherwise used." A hypothetical scenario
demonstrating the calculations involved in reporting aqueous ammonia generated from
anhydrous ammonia in water is given in Example 2.
Example 2: In a calendar year, a facility uses 30,000 pounds of anhydrous ammonia to ,
neutralize acids in a waste water stream. The neutralized waste stream (containing
aqueous ammonia from dissociated ammonium salts) is then transferred to a POTW.
The quantity to be applied toward threshold determinations is the total quantity of
anhydrous ammonia used in the waste stream neutralization, or 30,000 pounds. The
quantity of ammonia reported as transferred is 10 percent of the total quantity of
, aqueous ammonia transferred, or 3,000. pounds. • __ . . '
5'

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Section 2.2.2 Reporting Aqueous Ammonia Generated from the Dissociation of
Ammonium Salts (Other Than Ammonium Nitrate)
       If the source of aqueous ammonia is the dissociation of ammonium salts in water,
total aqueous ammonia (calculated in terms of NH3 equivalents) is calculated from the
weight percent (wt%) of the NH3 equivalents  of the ammonium salt. The NH3 equivalent
wt% of an ammonium salt is calculated using the following equation:
                                                    !           '  '
       NH3 equivalent wt% = (NH3 equivalent weight)/(MW ammonium  salt) x 100.

If the source of aqueous ammonia is a monovalent compound (such as ammonium chloride,
NHjCl, ammonium nitrate, NH4NO3, or ammonium bicarbonate, NH4HCO3), the NH3
equivalent weight is equal to the MW of NH3 (17.03 kg/kmol).  If divalent compounds  are
involved (such as ammonium carbonate, (NH4)2CO3), then the NH3  equivalent weight is
equal to the MW of NH3  multiplied by two.  Similarly, if trivalent compounds are involved,
then the NH3 equivalent weight is  equal to  the MW of NH3 multiplied  by three.
  Example 3:

  The NH3 equivalent wt% of ammonium chloride is calculated as follows:

   NH3 equivalent wt% = (NH3 equivalent weight)/(MW ammonium'chloride) x 100
   NH3 equivalent wt% = (17.03)/(53.49) x 100
   NH3 equivalent wt% = 31.84% .

  The NH3 equivalent wt% of ammonium carbonate is calculated  as follows:

   NH3 equivalent wt% = 2 x (NH3 equivalent weight)/(MW ammonium carbonate) x 100
   NH3 equivalent wt% = 2 x (17.03)7(96.09) x 100
   NH3 equivalent wt% = 35.45%                              -
       To aid the regulated community in reporting under the ammonia listing for aqueous
ammonia, the table of chemical sources of aqueous ammonium provided in Section 3 of this
document includes, in addition to CAS number, chemical name, and molecular weight, the
NH3 equivalent wt%  of the commonly used, water dissociable ammonium salts listed, in this
table.

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Example 4: In a calendar year, a facility uses 100,000 pounds of ammonium chloride,
NH4C1, in aqueous solution which is released to waste water streams, then transferred to
a POTW. The NH3 equivalent wt% of ammonium chloride is 31.84% (taken from
Table 1 in section 3 below or calculated as in Example 3 above). The total quantity of
aqueous ammonia present in solution is 31.84% of the 100,000 pounds of ammonia
chloride used, or 31,840 pounds. The quantity applied towards threshold determinations
for the ammonia listing is 10 percent of the total quantity of aqueous ammonia present
in solution, or 3,184 pounds. The quantity of ammonia reported as released or .-',•'
transferred is 10 percent of the total quantity of aqueous ammonia released or
transferred, or 3,184 pounds. •
Example 5: In a calendar year, a facility uses 500,000 pounds of ammonium carbonate,
(NH4)2CO3, and 400,000 pounds of ammonium bicarbonate, NH4HCO3,z« aqueous
solution which is released to waste water streams, then transferred to a POTW. The
NH3 equivalent wt% of ammonium carbonate is 35.45%, and the NH3 equivalent wt%
of ammonium bicarbonate is 21.54% (taken from Table 1 in Section 3 below or
calculated as in Example 3 above). The quantity of aqueous ammonia present in
solution from ammonium carbonate is 35.45% of the 500,000 pounds of ammonia
carbonate used, or 177,250 pounds. The quantity of aqueous ammonia present in
solution from ammonium bicarbonate, is 21.54% of the 400,000 pounds of ammonia
bicarbonate used, or 86,160 pounds. The total quantity of aqueous ammonia present in
solution is 263,410 pounds. The quantity applied towards threshold determinations for
•the ammonia listing is 10 percent of the total quantity of aqueous ammonia present in
solution, or 26,341 pounds. The quantity of ammonia reported as released or transferred
is 10 percent of the total quantity of aqueous ammonia released or transferred, or 26^341
pounds.
Section 2.2.3 Reporting Aqueous Ammonia Generated from the Dissociation of
Ammonium Nitrate

, Some sources of aqueous ammonia may be reportable under other EPCRA section
313 category listings. Ammonium nitrate (solution) is relevant to reporting under the
ammonia listing to the extent that 1.0 percent, of the total aqueous ammonia that results
when ammonium, nitrate dissociates is reported when determining thresholds and calculating
releases. However, under the nitrate compounds category listing, ammonium nitrate (and
other mixed salts containing ammonium and nitrate) must be reported hi its entirety. When
reporting ammonium nitrate under this category•..•listing, the total nitrate compound,
including both the nitrate ion portion and the ammonium counterion, is included when
determining threshold quantities. However, only the nitrate ion portion is included when
determining the amount of ammonium nitrate that is released, transferred, or otherwise
managed 'in wastes. The calculations involved in determining threshold and release
quantities for reporting under the nitrate compounds category listing are described in a

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separate directive, List of Toxic Chemicals -within the Water Dissociable Nitrate Compounds
Category and Guidance for Reporting (EPA document #745-R-95-002, February 1995).
Note: reporting ammonium nitrate under the ammonia listing and the nitrate compounds
category listing is effective for the 1995 reporting year for reports due July 1, 1996.
Example 6: In a calendar year, a facility uses 1,250,000 pounds of ammonium nitrate,
in aqueous solution which is released to waste water streams, then transferred
to a POTW. The NH3 equivalent wt% of ammonium nitrate is 21.28% (taken from
Table 1 in Section 3 below or calculated as in Example 3 above). The total quantity of
aqueous ammonia present in solution is 21.28% of the 1,250,000 pounds of ammonia
chloride used, or 266,000 pounds. The quantity applied towards threshold
determinations for the ammonia listing is 10 percent of the total quantity of aqueous
ammonia present ha solution, or 26,600 pounds. The quantity of ammonia reported as
released or transferred is 10 percent of the total quantity of aqueous ammonia released
or transferred, or 26,600 pounds. For determining thresholds and calculating releases
under the nitrate compounds category listing, see the separate directive, List of Toxic
Chemicals -within the Water Dissociable Nitrate Compounds Category and Guidance for
Reporting (EPA document #745-R-95-002, February, 1995).
Example 7: In a calendar year, a facility transfers 100,000 pounds of nitric acid (HNO3)
to an on-site treatment facility. The nitric acid is neutralized with anhydrous ammonia,
and treatment efficiency is 95 percent (the nitrate compound formed as a result of the
treatment is ammonium nitrate, NH4NO3). The neutralized waste stream (containing
aqueous ammonia from dissociated ammonium nitrate) is then transferred to a POTW.
The quantity of nitric acid neutralized is 95 percent of 100,000 pounds or 95,000
pounds. The quantity of nitric acid neutralized is converted first to kilograms then to
kilomoles using the following equations:

Kilograms HNO3 neutralized = (Ibs HNO3 neutralized) x (0.4536 kg/lb)
Kilomoles HNO3 neutralized = (kg HNO3) -f (MW of HNO3 in kg/kmol).

Substituting the appropriate values into the above equations yields:

Kilograms HNO3 neutralized = 95,000 Ibs x 0.4536 kg/lb
= 43,092 kg
Kilomoles HNO3 neutralized = 43,092 kg -^ 63.01 kg/kmol
= 683.9 kmol.

(Example 7 is continued below)

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(Example 7, continued)                T                      .              ' ~  --

The quantity of anhydrous ammonia used in kilomoles in the acid neutralization and the
quantity  of ammonium nitrate generated in kilomoles from the neutralization are equal
to the quantity of nitric acid neutralized (683.9 kmol). The quantity of anhydrous
ammonia used in kilograms and pounds in the acid neutralization is calculated  as
follows:

       Kilograms NH3 used = (kmol NH3) x (MW of NH3 in kg/kmol).
       Pounds NH3 used = (kg NH3) x (2.205 Ibs/kg).        .

Substituting the appropriate .values into the above equations yields:

       Kilograms NH3 used = (683.9 kmol) x (17.03 kg/kmol).
       = 11,647 kmol.                                      .
       Pounds NH3 used = (11,647 NH3)  x (2.205 Ibs/kg).  ,                       ,.
       = 25,682 pounds.

The quantity reported  applied towards threshold determinations for the ammonia listing
is the total quantity of anhydrous ammonia used in the acid neutralization, or 25,682
pounds.  The quantity of ammonia reported as released or transferred is 10 percent of
the total quantity of aqueous ammonia released  or transferred, or 2,568 pounds. For  -;
determining thresholds and calculating releases under the nitrate compounds category
listing, see the separate directive, List of Toxic Chemicals within  the Water Dissociable
Nitrate .Compounds Category and Guidance for Reporting (EPA  document #745-R-95-
002, February 1995).       .                                ;   '     ''    • •''-•'   .

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     Section 3. CAS Number List of Some Chemical Sources of Aqueous Ammonia
       EPA is providing the following table of CAS numbers and chemical names to aid
the regulated community in determining whether they need to report under the ammonia
listing for aqueous ammonia.  If a facility manufactures,  processes,  or otherwise uses,  in
aqueous solution, a chemical  which is listed below, they must report 10 percent of the total
aqueous ammonia that is the result of the dissociation of this chemical.  However, this list
is not exhaustive. If a facility manufactures,  processes,  or otherwise uses, in aqueous
solution,  a water dissociable ammonium compound, they must report 10 percent of the total
aqueous ammonia that is the result of the dissociation of the  compound, even if the
compound does not appear in the following table.
Table 1. Listing by CAS Number and Molecular Weight of Some Chemical Sources of Aqueous
Ammonia
Chemical Name
Ammonium acetate
Ammonium aluminum sulfate
(Ammonium aluminum disulfate)
Ammonium antimony fluoride
(Diammonium pentafluoroantimonate)
Ammonium arsenate
(Ammonium arsenate, hydrogen)
(Ammonium arsenate, dihydrogen)
Ammonium arsenate
(Diammonium arsenate)
(Diammonium arsenate, hydrogen)
(Diammonium arsenate, monohydrogen)
Ammonium arsenite
Ammonium azide
Ammonium benzenesulfonate
Ammonium benzoate
Ammonium bromate
Ammonium bromide
Ammonium cadmium chloride
(Ammonium cadmium trichloride)
Ammonium carbamate
Ammonium carbonate carbamate
Molecular
Weight* '
77.08
237.14
252.82
158.97
176.00
124.96
60.06
175.20
139.15
145.94
97.94
236.81
78.07
157.13
NH3 '
Equivalent
Wt%
22.09
7.181
13.47
10.71
19.35
13.63
28.35
9.720
12.24
11.67
17.39
7.191
21.81
21.68
CAS Number
631-61-8
7784-25-0
32516-50.0
13462-93-6
7784-44-3
13462-94-7
12164-94-2
19402-64-3
1863-63-4
13843-59-9
12124-97-9
18532-52-0 -•
1111-78-0
8000-73-5 .
                                         10

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Ammonium carbonate ... •
(Diammonium carbonate) - " •
Ammonium carbonate, hydrogen ...
(Ammonium bicarbonate)
Ammonium cerium nitrate ' . ..
.(Ammonium hexanitratocerate)
(Ammonium hexanitratocerate (IV))
(Diammonium cerium hexanitrate)
Ammonium cerous nitrate
(Ammonium cerous nitrate, tetrahydrate) ;
Ammonium chlorate ,
Ammonium perchlorate '
Ammonium chloride ,
Ammonium chromate ,
(Ammonium chromate (VI))
(Diammonium chromate) ;
Ammonium chromate
(Ammonium dichromate) . , •'
(Ammonium dichromate (VI))
(Ammonium bichromate)
(Diammonium dichromate) '
Ammonium chromium sulfate
(Ammonium chromic sulfate) . ,
Ammonium citrate
(Ammonium citrate, monohydrogen)
(Ammonium citrate, dibasic) '
(Diammonium citrate) .
(Diammonium citrate, hydrogen) ' • •
Ammonium citrate •' . •
(Ammonium citrate, tribasic) ,
Ctriammonium citrate) ,
Ammonium cobalt sulfate
(Ammonium cobaltous sulfate) '
Ammonium, cupric chloride ,
(Ammonium chlorocuprate (II)) ,
(Diammonium , copper tetrachloride)
(Diammonium tetrachlorocuprate)
Ammonium cyanate ,
(Ammonium isocyanate)
Ammonium cyanide .- , ,
96.09
79.06
548.23
486.22
101.49
117.49
53.49
152.07
252.06
265:17
226.19
243.22
289.14
24-1.43
60.06
'44.06
,35.45
21.54
6.213
7.005 '
16.78
14.49
31.84
22.40
13.51
6.422
15.06
21.01 ,
11.78
14,11
28.35
38.65
506-87-6
1066-33-7
16774-21-3*
13083-04-0
10192-29-7
7790-98-9
12125-02-9
7788-98-9
7789-09:5 :
13548-43-1
3012-65-5
3458-72-8
- „- ' - i
13596-46-8
15610-76-1
22981-32-4
12211-52-8
11

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Ammonium cyanoaurate, monohydrate
(Ammonium tetracyanoaurate, monohydrate)
Ammonium cyanoaurate
(Ammonium dicyanoaurate)
Ammonium ferricyanide
(Ammonium hexacyanoferrate (III))
(Triammonium hexacyanoferrate)
Ammonium ferrocyanide
(Ammonium hexacyanoferrate (II))
(Tetraammonium ferrocyanide)
(Tetraammonium hexacyanoferrate)
Ammonium fluoride /
Ammonium fluoride
(Ammonium difluoride)
(Ammonium bifluoride)
(Ammonium fluoride, hydrogen)
(Ammonium difluoride, hydrogen)
(Ammonium bifluoride, hydrogen)
Ammonium fluoroborate
(Ammonium tetrafluoroborate)
Ammonium fluorogermanate (TV)
(Ammonium hexafiuorogermanate (IV))
(Diammonium hexafluorogermanate)
Ammonium fluorophosphate
(Ammonium hexafluorophosphate)
Ammonium fluorosulfate
(Ammonium fluorosulfonate)
Ammonium formate
Ammonium gallium sulfate
Ammonium hydroxide
Ammonium iodide
Ammonium iridium chloride
(Ammonium chloroiridate (III))
(Ammonium hexachloroiridate)
(Triammonium hexachloroiridate)
Ammonium iron sulfate
(Ammonium ferric sulfate)
(Ammonium iron disulfate)
Ammonium iron sulfate
(Ammonium ferrous sulfate)
(Diammonium iron disulfate)
(Diammonium ferrous disulfate)
319.07
267.04
266.07
284.11
37.04
57.04
104.84
222.66
163.00
117.10
63.06.
282.90
35.05
144.94
459.05
269.02
286.05
5.337
6.377
19.20
23.98
45.98
29.86
16.24
15.30
10.45
14.54
27.01
6.020
48.59
11.75
11.13
6.330
11.91
14323-26-3
31096-40-9
14221-48-8
14481-29-9
12125-01-8
1341-49-7
13826-83-0
16962-47-3
16941-11-0
13446-08-7
540-69-2
15335-98-5
1336-21-6
12027-06-4
15752-05-3
10138-04-2
10045-89-3'
12

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Ammonium lactate
(Ammonium 2-hydroxypropionate)
Ammonium laurate
(Ammonium dodecanoate)
Arnmonium magnesium sulfate
Ammonium malate .
Ammonium malate, hydrogen
(Ammonium bimalate)
Ammonium molybdate
(Diammonium molybdate) •
Ammonium molybdate .
(Ammonium heptamolybdate)
(Ammonium molybdate, hydrate)
(Ammonium molybdate, tetrahydrate) • •
(Ammonium /xarramolybdate, tetrahydrate)
Ammonium nickel chloride, hexahydrate
Ammonium nickel sulfate -...'•
(Ammonium nickel sulfate, hexahydrate) •
(Ammonium nickel disulfate, hexahydrate)
(Diammonium nickel disulfate, hexahydrate).
Ammonium nitrate
Ammonium nitrate sulfate ;
.Ammonium nitrite
Ammonium oleate
Ammonium oxalate '
Ammonium palladium chloride
(Ammonium chloropalladate (II)) .
(Ammonium tetrachloropalladate (II))
(Diammonium tetrachloropalladate) .
Ammonium phosphate -
(Ammonium orthophosphate)
Ammonium phosphate
^Ammonium biphosphate)
(Ammonium phosphate, hydrogen)
(Ammonium phosphate, dihydrogen)
(Ammonium orthophosphate, dihydrogen)
(Ammonium phosphate, monobasic)
-107.11
217.35
252.50
168.15 -.-
151.12
196.'01
1163.8
183^09
286.88
80.04
212.18 ^
64.04
299.50
124.10
284.31 ,
149.09
115.03
-15.90
7.835
13.49
20.26 i '
11.27
17.38
8.780 . '
9.301
11.87
. i
21.28
24.08
26.59
5.686
27.45
11.98
34.27
14.80
515-98-0
2437-23-2
14727-95-8
6283-27-8
5972-71-4
13106-76-8
12054-85-2
16122-03-5
7785-20-8 .
6484-52-2
12436-94-1
13446-48-5
544-60-5
1113-38-8
13820-40-1
10124-31-9
7722-76-1
13

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Ammonium phosphate
(Ammonium phosphate, hydrogen)
(Ammonium orthophosphate, monohydrogen)
(Ammonium phosphate, dibasic)
(Ammonium orthophosphate, dibasic)
(Diammonium phosphate)
(Diammonium orthophosphate)
(Diammonium phosphate, hydrogen)
(Diammonium phosphate, monohydrogen)
(Diammonium orthophosphate, hydrogen)
Ammonium phosphinate
(Ammonium hypophosphite)
Ammonium phosphite
(Ammonium biphosphite)
(Ammonium phosphite, dihydrogen)
i
Ammonium picramate
Ammonium propionate
Ammonium rhodium chloride
(Ammonium chlororhodate (III))
(Ammonium hexachlororhodate (III))
(Triammonium rhodium hexachloride)
(Triammonium hexachlororhodate)
Ammonium salicylate
(Ammonium 2-hydroxybenzoate)
Ammonium selenide
Ammonium silicon fluoride
(Ammonium fluorosilicate)
(Ammonium hexafluorosilicate)
(Diammonium silicon hexafluoride)
(Diammonium fluorosilicate)
(Diammonium hexafluorosilicate)
Ammonium stearate
(Ammonium octadecanoate)
Ammonium succinate
(Diammonium succinate)
Ammonium sulfamate
(Ammonium amidosulfate)
(Ammonium amidosulfonate)
Ammonium sulfate
(Diammonium sulfate)
132.06
83.03
99.03
216.15
91.11
369.74
155.15
115.04
, 178.15
301.51
152.15
114.12
132.13
25.79
20.51
17.20
7.879
18.69
13.82
10.98
29.61
19.12
5.648
22.39
14.92
25.78
7783-28-0
7803-65-8
13446-12-3
1134-85-6
17496-08-1
15336-18-2
528-94-9
66455-76-3
16919-19-0
1002-89-7
2226-88-2
7773-06-0
7783-20-2
14

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Ammonium sulfate
(Ammonium bisulfate)
(Ammonium sulfate, hydrogen)
(Ammonium sulfate, .monohydrogeh) ,
Ammonium persulfate ' ',
(Ammonium peroxysulfate) .
(Ammonium peroxydisulfate)
(Diammonium persulfate)
(Diammonium peroxydisulfate)
Ammonium sulfide
(Ammonium bisulfide) - ,
(Ammonium sulfide, hydrogen)
Ammonium sulfide
(Ammonium monosulfide) , " . -
(Diammonium sulfide) ' v
Ammonium sulfide , .
(Diammonium pentasulfide)
Ammonium sulfite, monohydrate
(Diammonium sulfite, monohydrate) .
Ammonium sulfite
(Ammonium bisulfite)
(Ammonium sulfite, hydrogen) ...
Ammonium tetrachloroaurate (HI), hydrate '
Ammonium thiocarbamate .
Ammonium thiocarbonate
• (Diammonium trithiocarbonate) .
Ammonium thiocyanate
(Ammonium isothiocyanate)
(Ammonium sulfocyanate)
(Ammonium rhodanate)
(Rhodanid) '
Ammonium dithionate • , ,. ^
Ammonium thiosulfate
• (Ammonium hyposulfite) .
(Diammonium thiosulfate) ,
Ammonium tin bromide .
(Ammonium bromostannate (IV)) , .
(Ammonium hexabromostannate (IV))
(Diammonium hexabromostannate)
115.10
228.19^
51.11
68.14
196.39
116.13 '..
99.10
356.82
94.13
144.27 .
76.12
196.19 ,
148.20
.634.19
14.80
14.93 , . ' '
33.32
49.99
17.34
29.33
17.18
4.772
18.09 ;
23.61
22.37' . '
17.36
22.98
5.371
7803-63-6
7727-54-0
12124-99-1
12135-76-1
12135-77-2
,7783-11-1
10192-30-0
13874-04-9
16687-42-6
13453-08-2
1762-95-4
60816-52-6
7783-18-8 :
!
16925-34-1 '
15

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Ammonium tin chloride
(Ammonium chlorostannate (IV))
(Ammonium hexachlorostannate (IV)) \
(Diammonium tin hexachloride)
(Diammonium hexachlorostannate)
Ammonium titanium fluoride
(Ammonium fluorotitanate (TV))
(Ammonium hexafluorotitanate (IV))
(Diammonium titanium hexafluoride)
(Diammonium hexafluorotitanate)
Ammonium titanium oxalate, monohydrate
(Diammonium dioxalatooxotitanate, monohydrate)
Ammonium tungstate
(Ammonium tungstate (VI))
(Ammonium /jcrrotungstate)
(Hexaammonium tungstate)
Ammonium tungstate
(Ammonium tungstate (VI))
(Ammonium /joratungstate)
(Decaammonium tungstate)
Ammonium valerate
(Ammonium pentanoate)
Ammonium zinc chloride
(Ammonium chlorozincate)
(Ammonium tetrachlorozincate)
(Diammonium tetrachlorozincate)
367.48
197.95
276.00
1779.2
3058.6
119.16
243.27
9.269
17.21
12.34
5.743
5.568
14.29
14.00
16960-53-5
16962-40-6
10580-03-7
12028-06-7
11120-25-5
42739-3 8-«
14639-97-5
* For hydrated compounds, e.g. ammonium sulfite, monohydrate, the molecular weight excludes the weight of the hydrate
portion.
                                                       16

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