GB/T 31931-2015: Zinc or zinc alloy coating on steel sheets or strips - Determination of hexavalent chromium content. 1, 5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method

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Scope

This Standard specifies using Diphenylcarbazide Spectrophotometric Method to
determine the hexavalent chromium content.
This Standard is applicable to the zinc and zinc alloy coating on steel sheets or strips,
thereof including the determination of hexavalent chromium content on the pure zinc,
zinc-iron alloy, zinc-aluminum and aluminum-zinc alloy coating surfaces. The
measuring range is 2µg/g~100µg/g or 0.020µg/cm2~10µg/cm2.

Basic Data

Standard ID	GB/T 31931-2015 (GB/T31931-2015)
Description (Translated English)	Zinc or zinc alloy coating on steel sheets or strips - Determination of hexavalent chromium content. 1, 5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H11
Classification of International Standard	77.080.01
Word Count Estimation	6,633
Date of Issue	2015-09-11
Date of Implementation	2016-06-01
Quoted Standard	GB/T 1839; GB/T 6682; GB/T 7729
Regulation (derived from)	National Standard Announcement 2015 No.25
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Standard specifies the diphenyl hydrazine spectrophotometric method for determination of hexavalent chromium. This Standard applies to the steel sheet and strip surface of the zinc and zinc alloy coatings, including determination of pure zinc plating, zinc alloy, zinc, aluminum and aluminum-zinc alloy surface of hexavalent chromium content. Measurement range: 2 ��g/g ~ 100 ��g/g or 0.020 ��g/cm2 ~ 10 ��g/cm2.