Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Cadmium Nitrate Tetrahydrate Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Cadmium Nitrate Tetrahydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble Matter, Chloride, Sulfate, Calcium, Copper, Lead, Magnesium, Zinc, and Iron.
Cd(NO3)2 • 4H2O
Formula Wt 308.47
CAS No. 10022-68-1
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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solid production of other cadmium compounds melting point, 59 °C very soluble
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% Cd(NO3)2 · 4H2O Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.002% Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 0.02% Copper (Cu) . . . . . . . . . . . . . . . . . . . . . . . . 0.002% Lead (Pb) . . . . . . . . . . . . . . . . . . . . . . . . . 0.005% Magnesium (Mg) . . . . . . . . . . . . . . . . . . . . . 0.02% Zinc (Zn) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.001%
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4072 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By complexometric titration of cadmium). Weigh accurately about 1.2 g of sample, and dissolve in about 100 mL of water. Add 15 mL of hexamethylenetetramine reagent solution and 50 mg of xylenol orange indicator mixture. Titrate with 0.1 M EDTA volumetric solution to a color change of red-purple to yellow. One milliliter of 0.1 M EDTA corresponds to 0.03085 g of Cd(NO3)2 · 4H2O.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g in 200 mL of water.
Chloride [Part 2: Colorimetry and Turbidimetry; Chloride]. Use 0.20 g.
Sulfate [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Evaporate 2.5 g of sample with 5 mL of hydrochloric acid. Dissolve the residue in a minimum of water. Continue the procedure beginning with “Add 1 mL of dilute hydrochloric acid (1:19)…”.
Calcium, Copper, Lead, Magnesium, and Zinc (By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
For the Determination of Calcium, Copper, Lead, Magnesium, and Zinc
S a m p l e S t o c k S o l u t i o n A . Dissolve 10.0 g of sample with water in a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.10 g). S a m p l e S t o c k S o l u t i o n B . Transfer 10.0 mL of sample stock solution A to a 100 mL volumetric flask, and dilute to volume with water (1 mL = 0.01 g).
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4072 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
For the Determination of Calcium, Copper, Lead, Magnesium, and Zinc
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
0.2
0.02; 0.04
N/A
No
Cu
324.8
2.0
0.02; 0.04
A/A
No
Pb
217.0
2.0
0.05; 0.10
A/A
Yes
Mg
285.2
0.04
0.004; 0.008
A/A
Yes
Zn
213.9
0.04
0.01; 0.02
A/A
Yes
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
Iron [Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Dissolve 1.0 g of sample in 30 mL of water. Add 5 mL of hydrochloric acid, boil for 2 min, cool, and dilute with water to 40 mL.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4072 ACS Reagent Chemicals, Part 4
