Standard No.:	GB 7917.2-1987
English Name:	Standard methods of hygienic test for cosmetics; Arsenic
Chinese Name:	化妆品卫生化学标准检验方法 砷
Chinese Classification:	C51    Environmental sanitation
Professional Classification:	GB    National Standard
ICS Classification:	71.100.70 71.100.70    Cosmetics. Toiletries 71.100.70
Issued by:	Ministry of Health
Issued on:	1987-05-28
Implemented on:	1987-10-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	2000 words
Price(USD):	40.0
Delivery:	via email in 1 business day

1.1 Principle The pentavalent arsenic in the sample solution of the ashed or digested specimen will be reduced to trivalent arsenic under the action of kalium iodide and stannous chloride. The trivalent arsenic will generate arsine gas with the nascent hydrogen. The hydrogen sulfide interference is removed by cotton immersed in lead acetate solution and then the arsine gas acts with silver diethyl dithio carbamate which is dissolved in triethanolamine - chloroform and generate brownish red collargol silver; then colorimetric assay is conducted. Cobalt, nickel, mercury, silver, platinum, chromium and molybdenum may interfere the generation of arsine, but under normal conditions, the content in cosmetics will not cause interference. Stibium has an obvious interference on the determination.

Contents 1 Silver Diethyldithiocarbamate Spectrophotometric Method 2 Gutzeit Method Additional Explanation