Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Potassium Permanganate, Low in Mercury 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 Potassium Permanganate, Low in Mercury provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Mercury.
KMnO4
Formula Wt 158.03
CAS No. 7722-64-7
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . dark solid Applications . . . . . . . . . . . . . . . . . . . . . . . . oxidizing agent Aqueous solubility . . . . . . . . . . . . . . . . . . . . 6.4 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% KMnO4 Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.2% Chloride and chlorate (as Cl) . . . . . . . . . . . . . 0.005% Sulfate (SO4) . . . . . . . . . . . . . . . . . . . . . . . 0.02% Mercury (Hg) . . . . . . . . . . . . . . . . . . . . . . . 0.05 ppm
TESTS Assay and other tests except mercury are the same as for potassium permanganate, [Part 4: Potassium Permanganate].
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4302 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Mercury For the sample, place 1.0 g in a 125 mL conical flask, and add 10 mL of water. For the standard, place 10 mL of water in a similar flask, and add 0.05 μg of mercury [0.5 mL of a solution prepared freshly by diluting 1.0 mL of mercury ion (Hg) standard solution with water to 500 mL]. Add 2 mL of 4% potassium permanganate solution and 2 mL of 25% sulfuric acid reagent solution to each flask. Heat on a hot plate (~100 °C) for 30 min, then cool to room temperature. Transfer the contents of the sample flask to the aeration vessel, making the total volume about 50 mL. Rinse the flask with 4 mL of 10% hydroxylamine hydrochloride reagent solution, and add this to the aeration vessel also. Complete the reduction of manganese dioxide and mercury with 2 mL of 10% stannous chloride solution. Treat the standard solution in the same way. Obtain the peak height for the sample and standard solutions by CVAAS [Part 2: Trace and Ultratrace Elemental Analysis; Mercury Determination by CVAAS]. The peak height for the sample should not exceed that for the standard.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4302 ACS Reagent Chemicals, Part 4
