Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Lithium Chloride 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 Lithium Chloride 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, Titrable Base, Loss on Drying, Sulfate, Barium, Heavy Metals, Iron, Calcium, Potassium, and Sodium.
LiCl
Formula Wt 42.39
CAS No. 7447-41-8
Note: The formula weight of this reagent is likely to deviate from the value cited because the natural distribution of 6 Li and 7Li isotopes is often altered in current sources of lithium compounds.
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white solid matrix modifier melting point, 613 °C 81 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99% LiCl Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.01% Titrable base . . . . . . . . . . . . . . . . . . . . . . . 0.008 meq/g Loss on drying . . . . . . . . . . . . . . . . . . . . . . 1.0% Nitrate (NO3) . . . . . . . . . . . . . . . . . . . . . . . 0.001% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.01% Barium (Ba) . . . . . . . . . . . . . . . . . . . . . . . . 0.003%
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4195 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Heavy metals (by ICP–OES) Iron (Fe) . . . . . . . . . . . . Calcium (Ca) . . . . . . . . . Potassium (K) . . . . . . . . . Sodium (Na) . . . . . . . . . .
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0.002% 0.001% 0.01% 0.01% 0.20%
TESTS Assay (By indirect argentimetric titration of chloride). Weigh accurately about 0.15 g, dissolve in about 100 mL of water, and add 1 mL of dichlorofluorescein indicator solution. Titrate with 0.1 N silver nitrate volumetric solution to a pink end point. One milliliter of 0.1 N silver nitrate corresponds to 0.004239 g of LiCl.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 10.0 g dissolved in 150 mL of water.
Titrable Base Transfer 10.0 g to a 150 mL beaker. Dissolve in 100 mL of carbon dioxide-free water, add 0.15 mL of methyl red indicator solution, and titrate with 0.01 N hydrochloric acid. Correct for a blank determination. Not more than 8.0 mL of 0.01 N hydrochloric acid should be required to produce a pink color.
Loss on Drying Weigh accurately 1.0 g in a tared, preconditioned dish or crucible, and dry for 2 h at 105 °C.
Sulfate [Part 2: Colorimetry and Turbidimetry; Sulfate; Procedure for Sulfate, Method 1]. Use 0.5 g.
Barium Dissolve 3.3 g in 25 mL of water, filter if necessary, and add 2 mL of potassium dichromate reagent solution. Add ammonium hydroxide until the orange color dissipates and the yellow color persists. Any turbidity produced within 15 min should not exceed that in a standard containing 0.10 mg of added barium.
Heavy Metals ([Part 2: Trace and Ultratrace Elemental Analysis; Inductively Coupled Plasma−Optical Emission Spectroscopy (ICP–OES); Calculation of Heavy Metals (by ICP–OES) Results], by ICP–OES). Use 1.0 g sample.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4195 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Iron [Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. Use 1.0 g.
Calcium, Potassium, and Sodium (By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
For the Determination of Calcium, Potassium, and Sodium
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 = 0.1 g). S a m p l e S t o c k S o l u t i o n B . Pipette 10.0 mL of sample stock solution A into a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.01 g).
For the Determination of Calcium, Potassium, and Sodium
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
0.50
0.05; 0.10
N/A
No
K
766.5
0.50
0.05; 0.10
A/A
No
Na
589.0
0.005
0.01; 0.02
A/A
No
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4195 ACS Reagent Chemicals, Part 4
