United States
Environmental Protection
Agency
Office of Pollution
Prevention and Toxics
Washington, DC 20460
June 1999
EPA 745-R-99-008
TOXICS RELEASE INVENTORY
List of Toxic Chemicals within the Water, Dissociable Nitrate,
Compounds Category and Guidance for Reporting
Section 313 of the Emergency Planning and Community Right-to-Know 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 , ...'/..... 3
1-3 Chemicals within the Water Dissociable Nitrate
Compounds Category ... 3
1 -4 De Minimis Concentrations .4
Section 2. Guidance for Reporting Chemicals within the Water Dissociable Nitrate
Compounds Category . ...... .'. 5
2.1. Chemicals within the Water Dissociable Nitrate
Compounds Category ;, 5
2.2. Determining Threshold and Release Quantities for '.-' Y'
Nitrate Compounds ; 5
2.3. Reporting Nitrate Compounds Generated from the
Partial or Complete Neutralization of Nitric Acid 6
2.3.1. Estimating Nitric Acid Releases '. 7
2.3.2. Estimating Treatment Efficiencies for Nitric Acid Neutralization .... ..... 8
2.3.3. Estimating Releases of Nitrate Compounds Generated from the
Neutralization of Nitric Acid .; 10
2-4. Generation of Nitrate Compounds from Biological Wastewater
Treatment jj
Section3. CAS Number List of Some of the Individual Chemicals within the
Water Dissociable Nitrate Compounds Category .. i. 12
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Section 1. Introduction
On November 30,1994, EPA added 286 chemicals and chemical categories, which
include 39 chemicals as part of two delineated categories, to 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. These additions are described at 59 FR 61432, and are
effective January 1, 1995 for reports due July 1, 1996. Six chemical categories (nicotine and
salts, strychnine and salts, polycyclic aromatic compounds, water dissociable nitrate compounds,
diisocyanates, and polychlorinated alkanes) are included in these additions. At the time of the
addition, EPA indicated that the Agency would develop, as appropriate, interpretations and
guidance that the Agency determines are necessary to facilitate accurate reporting for these
categories. This document constitutes such guidance for the water dissociable nitrate compounds
category.
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 is included in a covered Standard Industrial Classification (SIC) code as listed
in the following table; and
Industrial Sector
Manufacturing
Metal mining
Coal Mining
Electrical utilities
Treatment, Storage, and Disposal facilities
Solvent recovery services
Chemical distributors
Petroleum bulk terminals
•^•••^^^••^•^•i^Mi^^a^Ma
SIC code , |
20-39
10 (except 1011, 1081, and 1094)
12 (except 124 11)
491 1, 4931, and 4939, limited to facilities that combust coal
and/or oil for the purpose of generating electricity for
distribution in commerce
4953, limited to RCRA Subtitle C permitted or interim status
facilities
7389, limited to facilities primarily engaged in solvent
recovery services on a contract or fee basis
5169
5171
It has 10 or more full-time employees (or the equivalent 20,000 hours per year);
and
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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.
If a facility processes any of the listed toxic chemicals, the threshold quantity will be:
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.
EPCRA section 313 requires threshold determinations for chemical categories to be based
on the total of all chemicals in the category manufactured, processed, or otherwise used. For
example, a facility that manufactures three members of a chemical category would count the total
amount of all three chemicals manufactured towards the manufacturing threshold for that
category. When filing reports for chemical categories, the releases are determined in the same
manner as the thresholds. One report is filed for the category and all releases are reported on this
form.
Section 1.3 Chemicals within the Water Dissociable Nitrate Compounds Category
EPA is providing a list of CAS numbers and chemical names to aid the regulated
community in determining whether they need to report for the water dissociable nitrate
compounds category. The list includes individual chemicals within the water dissociable nitrate
compounds category. If a facility is manufacturing, processing, or otherwise using a chemical
which is on this list, they must report this chemical. However, this list is not exhaustive. If a
facility is manufacturing, processing, or otherwise using a water dissociable nitrate compound,
they must report the chemical, even if it does not appear on the list.
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Section 1.4 De Minimis Concentrations
The water dissociable nitrate compounds category is subject to the one percent de
minimis concentration. Thus, mixtures that contain members of this category equal to or in
excess of the de minimis should be factored into threshold and release determinations.
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Section 2. Guidance for Reporting Chemicals within the
Water Dissociable Nitrate Compounds Category
Note: for the purposes of reporting under the nitrate compounds category, water
dissociable means that the nitrate ion dissociates from its counterion when in solution.
Section 2.1 Chemicals within the Water Dissociable Nitrate Compounds Category
Chemicals within the nitirate compounds category are only reportable when in aqueous
solution. All water dissociable nitrate compounds are included in the nitrate compounds
category, including ammonium nitrate. Specifically listed section 313 chemicals are not
included in threshold determinations for chemical categories such as the water dissociable nitrate
compounds category. Specifically listed toxic chemicals are subject to their own individual
threshold determinations. As of December 1, 1994, ammonium nitrate (solution) is not an
individually listed chemical on the EPCRA section 313 list. However, ammonium nitrate is still
subject to reporting under the nitrate compounds category. In addition, the aqueous ammonia
from the dissociation of ammonium nitrate when in aqueous solution is subject to reporting
under the ammonia listing.
Section 2.2 Determining Threshold and Release Quantities for Nitrate Compounds
The total nitrate compound, including both the nitrate ion portion and the counterion, is
included in the nitrate compounds category. When determining threshold amounts, the total
weight of the nitrate compound is to be included in all calculations. However, only the nitrate
ion portion is to be included when determining the amount of the chemicals within the nitrate
compounds category that is released, transferred, or otherwise managed in wastes.
Example 1: In a calendar year, a facility processes 100,000 pounds of ammonium'nitrate (NH4NO3), in aqueous
solution, which is released to wastewater streams, then transferred to a POTW. The quantity applied towards
threshold calculations for the nitrate compounds category is the total quantity of the nitrate compound or
100,000 pounds. Since this quantity exceeds the 25,000 pound processing threshold, the facility is required to
report for the nitrate compounds category. Under the nitrate compounds category, only the weight of the nitrate
ion portion of ammonium nitrate is included in release and transfer calculations. The molecular weight of
ammonium nitrate is 80.04 and the weight of the nitrate ion portion is 62.01 or 77.47 percent of the molecular
weight of ammonium nitrate. Therefore, the amount of nitrate ion reported as transferred to the POTW is 77.47
percent of 100,000 pounds, or 77,470 pounds (reported as 77,000 pounds); The aqueous ammonia from
ammonium nitrate is reportable under the EPCRA Section 313 listing for ammonia. For determining thresholds
and calculating releases under the ammonia listing, see the separate directive, Guidance for Reporting Aqueous
Ammonia (EPA document #745-R-95-003, July, 1995).
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Example 2: In a calendar year, a facility manufactures as by-products 20,000 pounds of sodium nitrate (NaNO3)
and 10,000 pounds of calcium nitrate (Ca(NO3)2), both in aqueous solutions, and releases these solutions to
wastewater streams. The total quantity of nitrate compounds manufactured by the facility is the sum of the two
chemicals, or 30,000 pounds, which exceeds the manufacturing threshold quantity of 25,000 pounds. The
facility therefore is required to report for the nitrate compounds category. By weight, the nitrate ion portion is
72.96 percent of sodium nitrate and is 75.57 percent of calcium nitrate. Of the 20,000 pounds of the sodium
nitrate in solution, 72.96 percent or 14,592 pounds is nitrate ion, and similarly, of the 10,000 pounds of the
calcium nitrate in solution, 75.57 percent or 7,557 pounds is nitrate ion. The total nitrate ion in aqueous
solution released by the facility is the sum of the nitrate ion in the two solutions, or 22,149 pounds (reported as
22,000 pounds).
Section 2.3 Reporting Nitrate Compounds Generated from the Partial or Complete
Neutralization of Nitric Acid
Nitric acid is an individually listed chemical on the original EPCRA section 313 list and
is reported as a separate chemical if the manufacture, process or otherwise use thresholds are
exceeded. The partial or complete neutralization of nitric acid results in the formation of nitrate
compounds which are reported as chemicals within the nitrate compounds category if their
manufacture, process or otherwise use thresholds are exceeded.
Mineral acids such as nitric acid may be present in aqueous waste streams that are sent to
on-site neutralization or are discharged to a publicly owned treatment works (POTW) or other
off-site treatment facility. As stated in the Toxic Chemical Release Inventory Reporting Form R
and Instructions document (revised 1993 version, EPA 745-K-94-001), on-site acid
neutralization and its efficiency must be reported in Part II, section 7A of Form R (waste
treatment methods and efficiency section). For purposes of reporting on Form R, EPA considers
a waste mineral acid at a pH 6.0 or higher to be 100 percent neutralized (water discharges to
receiving streams or POTWs are reported as zero). The nitrate compounds produced from the
complete neutralization (pH 6.0 or above) of nitric acid are reportable under the nitrate
compounds category and should be included in all threshold and release calculations. Two Form
R reports would be required if the manufacture, process or otherwise use thresholds are exceeded
for nitric acid and for the nitrate compounds category.
If the nitric acid treatment efficiency is not equal to 100 percent (pH is less than 6.0), the
amount of the acid remaining in the waste stream which is released to the environment on-site or
off-site must be reported in Part II of Form R. The nitrate compounds produced from the partial
neutralization of nitric acid are reportable under the nitrate compounds category and should be
included in all threshold and release calculations. Two reports would again be required if the
manufacture, process or otherwise use thresholds are exceeded for nitric acid and for the nitrate
compounds category.
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Section 2.3.1 Estimating Nitric Acid Releases
The pH of the waste stream can be used to calculate the amount of nitric acid in the
stream and the efficiency of neutralization. The pH is a measure of the acidity or alkalinity of a
waste stream and can be obtained readily using a pH meter or pH.sensitive paper. The pH scale
itself varies from 0.0 to 14.0.
The total nitric acid concentration (ionized and unionized) in pounds/gallon can be
calculated by using the pH value of the solution, the molecular weight and ionization constant of
the acid, and appropriate conversion factors. The total acid concentration for nitric acid for
different pH values is listed in Table 1. The calculation of mineral acid concentrations and the
derivation of Table 1 are discussed in a separate directive, Estimating Releases for Mineral Acid
Discharges Using pH Measurements, and in an addendum to this directive.
The procedure outlined in this guidance document for calculating the quantity of nitrate
compounds formed from the complete or partial neutralization of nitric acid can be used if nitric
acid is the only mineral acid in a solution. In addition, the calculation of nitric acid releases
using only pH measurements is a rough estimate. The subsequent calculation of nitrate
compound releases is therefore also only a rough estimate. The estimates can be made for a
waste stream with a steady pH below 6.0 or for one whose pH temporarily drops to below pH
6.0. Facilities should use their best engineering judgement and knowledge of the solution to
evaluate how reasonable the estimates are.
Example 3: In a calendar year, a facility transfers 1.0 million gallons of a solution containing nitric acid
(HNO3), at pH 4.0, to a POTW. Using Table 1 (next page), a pH of 4.0 corresponds to a concentration of
0.0000520 Ibs HNO3/gallon of solution. The weight of HNO3 transferred can be estimated using the equation:
Transfer of HNO3 = (concentration of HNO3,) x (effluent flow rate)
Substituting the example values into the above equation yields:
Transfer of HNO3 = 0.0000520 Ibs/gal HNO3 x 1,000,000 gal sohition/yr = 52 Ib/yr
Example 4: A facility had an episodic release of nitric acid (HNO3) in which the waste stream was temporarily
below pH 6.0. During the episode, the waste water (pH 2.0) was discharged to a river for 20 minutes at a rate
of 100 gallons per minute. Using Table 1, a pH of 2.0 for HN03 represents a concentration of 0.0052000 Ibs
HNO3/gallon of solution. The amount of the HNO3 released can be estimated using the following equation:
Release of HNO3 = (concentration of HNO3) x (effluent flow rate).
Substituting the example values in the above equation:
Release of HNO3 = 0.0052000 Ibs/gal x 100 gal/min x 20 min = 10 Ibs
7
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Table 1. Nitric Acid Concentration Versus pH
pH
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
Nitric Acid Concentration
(Ibs/gallon)
0.5200000
0.3300000
0.2100000
0.1300000
0.0830000
0.0520000
0.0330000
0.0210000
0.0130000
0.0083000
0.0052000
0.0033000
0.0021000
0.0013000
0.0008300
pH
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
Nitric Acid Concentration
(Ibs/gallon)
0.0005200
0.0003300
0.0002100
0.0001300
0.0000830
0.0000520
0.0000330
0.0000210
0.0000130
0.0000083
0.0000052
0.0000033
0.0000021
0.0000013
0.0000008
0.0000005
Section 2.3.2 Estimating Treatment Efficiencies for Nitric Acid Neutralization
Nitric acid solutions that are neutralized to a pH of 6.0 or above have a treatment
efficiency of 100 percent. If nitric acid is neutralized to a pH less than 6.0, then the reportable
treatment efficiency is somewhere between 0 and 100 percent. It is possible to estimate the
neutralization treatment efficiency using nitric acid concentration values directly from Table 1 in
the equation given below. The concentrations correspond to the pH values before and after
treatment.
Treatment Efficiency (I-E)/I x 100
where I = acid concentration before treatment
E = acid concentration after treatment
8
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Example 5: A nitric acid (HNO3) waste-stream of pH 2.4 is neutralized topH 4.6. Using Table 1, the initial
nitric acid concentrations 0.0021000 mol/liter and the final concentration Is 0.0000130 mol/liter. Substituting
these values into the equation for treatment efficiency:
Treatment Efficiency = (0.0021000 - 0.0000130)70.0021000 x 100 = 99.4 percent.
For strong acids only, including nitric acid, the net difference in pH before and after
treatment can be used to estimate the treatment efficiency, since pH is directly proportional to the
acid concentration. For example, a pH change of one unit results in a treatment efficiency of 90
percent, whether the pH change is from pH 1.0 to pH 2.0, or from pH 4.0 to pH 5.0. Table 2
summarizes treatment efficiencies for various pH changes (the pH change is the difference
between the initial pH and the pH after neutralization). In Table 2, some pH changes result in the
same treatment efficiency values due to rounding to one decimal place.
Table 2. Nitric Acid Treatment Efficiencies for Various pH Changes
pH Change
1.0
1.1
1.2
1.3
1.4
1.5
- 1.6
1.7
1.8
1.9
Treatment Efficiency (%)
90.0
92.1
93.7
95.0
96.0
96.8
97.5
98.0
98.4
98.7
pH Change
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0 ;
Treatment Efficiency (%)
99.0
99.2
99.4
99.5
99.6
99.7
99.8
99.8
99.8
99.9
99.9
Example 6: If a nitric acid (HNO3) waste stream of pH 2.0 is treated to pH 4.0, the pH change is 2 units. Using
Table 2 above, the treatment efficiency is given as 99.0 percent.
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Section 2.3.3 Estimating Releases of Nitrate Compounds Generated from the
Neutralization of Nitric Acid
The nitrate compounds produced from the complete neutralization (pH 6.0 or above) or
partial neutralization (pH less than 6.0) of nitric acid are reportable under the nitrate compounds
category if the appropriate threshold is met and should be included in all threshold and release
calculations. In order to determine the quantity of a nitrate compound generated and released,
the quantity of nitric acid released must be known (or calculated from the equations used in
Examples 3 and 4 above) as well as the nitric acid treatment efficiency (calculated from the
equations used in Examples 5 and 6 above).
The neutralization of nitric acid will most likely result in the generation of monovalent
nitrate compounds (such as sodium nitrate and potassium nitrate). The quantity of these
compounds formed in kilomoles will be equal to the quantity of the nitric acid neutralized in
kilomoles. If divalent nitrate compounds are formed (such as calcium nitrate) the quantity of
these compounds formed in kilomoles will be equal to one-half the quantity of the nitric acid
neutralized in kilomoles. Similarly, if trivalent nitrate compounds are formed (such as iron (III)
nitrate) the quantity formed of these compounds in kilomoles will be equal to one-third the
quantity of the nitric acid neutralized in kilomoles. Note: to calculate the releases of nitrate
compounds generated from the neutralization of nitric acid, the molecular weight of the nitrate
compound formed must be used. Molecular weights of some of the individual chemicals within
the water dissociable nitrate compounds category are given in Table 3.
10
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Example 7: In a calendar year, a facility transfers 50,000 pounds of nitric iacid (HNO3) to an on-site treatment
facility. The nitric acid treatment efficiency is 95 percent, and the nitrate compound formed as a result of the
treatment is sodium nitrate (NaNO3). The quantity of nitric acid transferred that is neutralized (generating
sodium nitrate) is 95 percent of 50,000 pounds, or 47,500 pounds. The mplecular weight of nitric acid is 63.01
kg/kmol, and the molecular weight of sodium nitrate is 84.99 kg/kmol. 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 (0.453.6 kg/lb)
Kilomoles HNO3 neutralized = (kg HNO3) - (MW of HNO3 in kg/kmol)
Substituting the example values into the above equation yields:
Kilograms HNO3 neutralized = 47,500 Ibs x 0.4536 kg/lb = 21,546 kg
Kilomoles HNO3 neutralized = 21,546 kg - 63.01 kg/kmol = 341.9 kmol
The quantity of sodium nitrate generated in kilomofes is equal to the quantity of nitric acid neutralized (341.9
kmol). The quantity of sodium nitrate generated in kilomoles is converted first to kilograms then to pounds
using the following equations:
Kilograms NaNO3 generated = (kmol NaNO3) x (MW of NaNO3 in kg/kmol)
Pounds NaNO3 generated = (kg NaNO3) x (2.205 Ibs/kg)
Substituting the values into the above equation yields: :
Kilograms NaNO3 generated = 341.9 kmol x 84.99 kg/kmol = 29,058 kg
Pounds NaNO3 generated = 29,058 kg x 2.205 Ibs/kg = 64,073 pounds (reported as 64,000 pounds).
The 64,000 pounds of sodium nitrate generated is the quantity used to determine whether thresholds have been
met or exceeded. The quantity of nitrate ion released is calculated as in Example 1 above.
Section 2.4 Generation of Nitrate Compounds from Biological Wastewater Treatment
If a facility treats wastewater on-site biologically, using the activated sludge process, for
example, the facility may be generating nitrate compounds as by-products of this biological
process. The nitrate ion generated from this process will be associated with various counterions
(e.g. sodium ion, potassium ion). In the absence of information on the identity of the counterion,
a facility should assume for the purposes of EPCRA section 313 threshold determinations that
the counterion is sodium ion.
11
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Section 3. CAS Number List of Some of the Individual Chemicals within the
Water Dissociable Nitrate Compounds Category
EPA is providing the following list of CAS numbers and chemical names to aid the
regulated community in determining whether they need to report for the water dissociable nitrate
compounds category. If a facility is manufacturing, processing, or otherwise using a chemical
which is listed below, they must report this chemical. However, this list is not exhaustive. If a
facility is manufacturing, processing, or otherwise using a water dissociable nitrate compound,
they must report this chemical, even if it does not appear on the following list.
Table 3. Listing by CAS Number of Some of the Individual
Chemicals within the Water Dissociable Nitrate Compounds Category
Chemical Name
Aluminum nitrate, nonahydate
Ammonium nitrate
Cerium (III) ammonium nitrate, tetrahydrate
Cerium (IV) ammonium nitrate
Barium nitrate
Beryllium nitrate, trihydrate
Cadmium nitrate
Cadmium nitrate, tetrahydrate
Calcium nitrate
Calcium nitrate, tetrahydrate
Cerium (III) nitrate, hexahydrate
Cesium nitrate
Chromium (III) nitrate, nonahydrate
Cobalt (II) nitrate, hexahydrate
Copper (II) nitrate, trihydrate
Copper (II) nitrate, hexahydrate
Molecular Weight*
213.00
80.04
486.22
548.23
261.34
133.02
236.42
236.42
164.09
164.09
326.13
194.91
238.01
182.94
187.56
187.56
CAS Number
7784-27-2
6484-52-2
13083-04-0
10139-51-2
10022-31-8
7787-55-5
10325-94-7
10022-68-1
10124-37-5
13477-34-4
10294-41-4
7789-18-6
7789-02-8
10026-22-9
10031-43-3
13478-38-1
*For hydratcd compounds, e.g. aluminum nitrate, nonahydrate, the molecular weight excludes the weight of the hydrate
portion. For example, the same molecular wieght is provided for aluminum nitrate, nonahydrate and aluminum nitrate.
12
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Table 3. Listing by CAS Number of Some of the Individual
Chemicals within the Water Dissociable Nitrate Compounds Category (continued)
Chemical Name
Dysprosium (III) nitrate, pentahydrate
Erbium (III) nitrate, pentahydrate
Gadolinium (III) nitrate, hexahydrate
Gallium nitrate, hydrate
Iron (III) nitrate, hexahydrate
Iron (III) nitrate, nonahydrate
Lanthanum (III) nitrate, hexahydrate
Lead (II) nitrate
Lithium nitrate
Lithium nitrate, trihydrate
Magnesium nitrate, dihydrate
Magnesium nitrate, hexahydrate
Manganese (II) nitrate, tetrahydrate
Neodymium (III) nitrate, hexahydrate
Nickel (II) nitate, hexahydrate
"Potassium nitrate
Rhodium (III) nitrate, dihydrate
Rubidium nitrate
Samarium (III) nitrate, hexahydrate
Samarium (III) nitrate
Samarium (III) nitrate, tetrahydrate
Silver nitrate
Sodium nitrate
Molecular Weight*
348.51
353.27
343.26
255.73
241.86
241.86 :
324.92
331.21
68.95
68.95
148.31 ,
148.31
178.95
330.25
182.70
101.10
288.92
147.47
336.37
230.97
230.97
169.87
84.99
CAS Number
10031-49-9
10031-51-3
19598-90-4
69365-72-6
13476-08-9
7782-61-8
10277-43-7
10099-74-8
7790-69-4
13453-76-4
15750-45-5
13446-18-9
20694-39-7
16454-60-7
13478-00-7
7757-79-1
13465-43-5
13126-12-0
13759-83-6
13465-60-6
16999-44-3
7761-88-8
7631-99-4
*For hydrated compounds, e.g. aluminum nitrate, nonahydrate, the molecular weight excludes the weight of the hydrate
portion. For example, the same molecular wieght is provided for aluminum nitrate, nonahydrate and aluminum nitrate.
13
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Table 3. Listing by CAS Number of Some of the Individual
Chemicals within the Water Dissociable Nitrate Compounds Category (continued)
Chemical Name
Strontium nitrate
Strontium nitrate, tetrahydrate
Terbium (III) nitrate, hexahydrate
Thorium (IV) nitrate
Thorium (IV) nitrate, tetrahydrate
Yttrium (III) nitrate, hexahydrate
Yttrium (III) nitrate, tetrahydrate
Zinc nitrate, trihydrate
Zinc nitrate, hexahydrate
Zirconium (IV) nitrate, pentahydrate
Molecular Weight*
211.63
211.63
344.94
480.06
480.06
274.92
274.92
189.39
189.39
339.24
CAS Number
10042-76-9
13470-05-8
13451-19-9
13823-29-5
13470-07-0
13494-98-9
13773-69-8
131446-84-9
10196-18-6
13986-27-1
*For hydrated compounds, e.g. aluminum nitrate, nonahydrate, the molecular weight excludes the weight of the hydrate
portion. For example, the same molecular wieght is provided for aluminum nitrate, nonahydrate and aluminum nitrate.
14
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