Source: https://www.law.cornell.edu/cfr/text/40/part-425/appendix-A
Timestamp: 2016-07-23 22:24:24
Document Index: 107174685

Matched Legal Cases: ['art 425', 'art 425', 'art 425', 'art 425', 'art 425', 'art 425']

40 CFR Part 425, Appendix A to Part 425 - Potassium Ferricyanide Titration Method | US Law | LII / Legal Information Institute
CFR › Title 40 › Chapter I › Subchapter N › Part 425 › Appendix A 40 CFR Part 425, Appendix A to Part 425 - Potassium Ferricyanide Titration Method
View PDF at GPOPt. 425, App. A
6. Preparation of stock sulfide standard, 1000 ppm: Dissolve 2.4 g. reagent grade sodium sulfide in 1 liter of distilled water. Store in a tightly stoppered container. Diluted working standards must be prepared fresh daily and their concentrations determined by EPA test procedure 376.1 (see 40 CFR 136.3, Table IB, parameter 66 (49 FR 43234, October 26, 1984, with correction notice at 50 FR 690, January 4, 1985)) immediately prior to use.
where A=volume in ml. of potassium ferricyanide solution used,
and B=normality of potassium ferricyanide solution.
(b)(1) Calculate clean water precision and accuracy in accordance with standard statistical procedures. Clean water acceptance limits are presented in paragraph 2(b)(2) below. These criteria must be met or exceeded before sample analyses can be initiated. A clean water standard must be analyzed with each sample set and the established criteria met for the analysis to be considered under control.
Title 40 published on 2015-07-01.No entries appear in the Federal Register after this date, for 40 CFR Part 425.