United States
Environmental Protection
Agency
Office of Environmental
Information
Washington, DC 20460
Revised December 2000
EPA 745-R-00-006
**EPA
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 1
1.1 Who Must Report 1
1.2 Thresholds 2
1.3 Chemicals within the Water Dissociable Nitrate
Compounds Category 2
1.4 De Minimis Concentrations 3
Section 2. Guidance for Reporting Chemicals within the Water Dissociable Nitrate
Compounds Category 4
2.1. Chemicals within the Water Dissociable Nitrate
Compounds Category 4
2.2. Determining Threshold and Release Quantities for
Nitrate Compounds 4
2.3. Reporting Nitrate Compounds Generated from the
Partial or Complete Neutralization of Nitric Acid 5
2.3.1. Estimating Nitric Acid Releases 6
2.3.2. Estimating Treatment Efficiencies for Nitric Acid Neutralization 7
2.3.3. Estimating Releases of Nitrate Compounds Generated from the
Neutralization of Nitric Acid 9
2.4. Generation of Nitrate Compounds from Biological Wastewater
Treatment 10
Section 3. CAS Number List of Some of the Individual Chemicals within the
Water Dissociable Nitrate Compounds Category 11
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FOREWORD
This document is an updated version of the previous document, EPA 745-R-99-008, June
1999. This version has the following updates:
• In SIC code table on page 3, the SIC code for the industrial sector of coal mining has been
changed from 12 (except 12411) to 12 (except 1241); and
In Example 5 on page 9, the unit mol/liter is changed to Ib/gal.
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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, poly cyclic
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 facility is subjected 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 SIC code
Metal mining
Coal Mining
Manufacturing
Electrical utilities
Treatment, Storage, and Disposal facilities
Chemical distributors
Petroleum bulk terminals
Solvent recovery services
10 (except 1011, 1081, and 1094)
12 (except 1241)
20-39
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 facilities regulated under the RCRA Subtitle C, 42
U.S.C. section 6921 et seq.)
5169
5171
7389 (limited to facilities primarily engaged in solvent recovery
services on a contract or fee basis)
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It has 10 or more full-time 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 during 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 during 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 during 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-00-004, Revised December, 2000).
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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.
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 current version of Toxic Chemical Release Inventory Reporting
Form R and Instructions document, on-site acid neutralization and its efficiency must be reported in
Part n, section 7 A 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 n 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 Ib 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 Ib/gal HNO3 x 1,000,000 gal solution/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 Ib 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 Ib/gal x 100 gal/min x 20 mm = 10 pounds
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Example 5: A nitric acid (HNO3) waste-stream of pH 2.4 is neutralized to pH 4.6. Using Table 1, the initial nitric acid
concentrations 0.0021000 Ib/gal and the final concentration is 0.0000130 Ib/gal. Substituting these values into the equation
for treatment efficiency:
Treatment Efficiency = (0.0021000 - 0.0000130)70.0021000 x 100 = 99.4 percent.
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
(Ib/gal)
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
Ob/gal)
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
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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)/IxlOO
where I = acid concentration before treatment
E = acid concentration after treatment
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
10
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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.
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 (HI) 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 nitrate
portion of 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
O
11
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Example 7: In a calendar year, a facility transfers 50,000 pounds of nitric acid (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 molecular 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 = (Ib HNO3 neutralized) x (0.4536 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 Ib 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 kilomoles 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 Ib/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 Ib/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.
12
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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 (HI) ammonium nitrate, tetrahydrate
Cerium (TV) ammonium nitrate
Barium nitrate
Beryllium nitrate, trihydrate
Cadmium nitrate
Cadmium nitrate, tetrahydrate
Calcium nitrate
Calcium nitrate, tetrahydrate
Cerium (IE) nitrate, hexahydrate
Cesium nitrate
Chromium (HI) nitrate, nonahydrate
Cobalt (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
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
*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.
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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
Copper (II) nitrate, trihydrate
Copper (II) nitrate, hexahydrate
Dysprosium (HI) nitrate, pentahydrate
Erbium (in) nitrate, pentahydrate
Gadolinium (HI) nitrate, hexahydrate
Gallium nitrate, hydrate
Iron (HI) nitrate, hexahydrate
Iron (HI) nitrate, nonahydrate
Lanthanum (HI) nitrate, hexahydrate
Lead (n) nitrate
Lithium nitrate
Lithium nitrate, trihydrate
Magnesium nitrate, dihydrate
Magnesium nitrate, hexahydrate
Manganese (n) nitrate, tetrahydrate
Neodymium (HI) nitrate, hexahydrate
Nickel (n) nitate, hexahydrate
Potassium nitrate
Rhodium (HI) nitrate, dihydrate
Rubidium nitrate
Samarium (HI) nitrate, hexahydrate
Molecular Weight*
187.56
187.56
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
CAS Number
10031-43-3
13478-38-1
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
*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.
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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
Samarium (HI) nitrate
Samarium (HI) nitrate, tetrahydrate
Silver nitrate
Sodium nitrate
Strontium nitrate
Strontium nitrate, tetrahydrate
Terbium (HI) nitrate, hexahydrate
Thorium (TV) nitrate
Thorium (IV) nitrate, tetrahydrate
Yttrium (HI) nitrate, hexahydrate
Yttrium (HI) nitrate, tetrahydrate
Zinc nitrate, trihydrate
Zinc nitrate, hexahydrate
Zirconium (IV) nitrate, pentahydrate
Molecular Weight*
230.97
230.97
169.87
84.99
211.63
211.63
344.94
480.06
480.06
274.92
274.92
189.39
189.39
339.24
CAS Number
13465-60-6
16999-44-3
7761-88-8
7631-99-4
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.
15
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