Monograph pubs.acs.org/doi/book/10.1021/acsreagents
2,6-Dichloroindophenol Sodium Salt (2,6-Dichloro-N-[(4-hydroxyphenyl)imino]-2,5-cyclohexadien-1-one, Sodium Salt) 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 2,6-Dichloroindophenol Sodium Salt 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: Loss on Drying and Interfering Dyes.
O:C6H2Cl2:NC6H4ONa
Formula Wt 290.08
CAS No. 620-45-1
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . dark green solid Applications . . . . . . . . . . . . . . . . . . . . . . . . redox indicator Aqueous solubility . . . . . . . . . . . . . . . . . . . . slightly soluble
SPECIFICATIONS Maximum Allowable Loss on drying . . . . . . . . . . . . . . . . . . . . . . 12.0% Interfering dyes . . . . . . . . . . . . . . . . . . . . . Passes test
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4116 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Loss on Drying Weigh accurately about 1.0 g, and dry at 120 °C to constant weight.
Interfering Dyes
For the Determination of Interfering Dyes
S o l u t i o n A . Dissolve 50 mg of the sample and 42 mg of sodium bicarbonate in water, and dilute with water to 200 mL. Filter through a dry filter, rejecting the first 20 mL of the filtrate. S o l u t i o n B . Dissolve 50 mg of ascorbic acid in 50 mL of a solution composed of 1.5 g of metaphosphoric acid plus 4 mL of glacial acetic acid, and dilute to 50 mL with water.
To 15 mL of solution A, add 2.5 mL of solution B. The mixture should become nearly colorless, with no trace of red or blue.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4116 ACS Reagent Chemicals, Part 4
