Standard No.:	GB 223.19-1989
English Name:	Methods for chemical analysis of iron steel and alloy; The neocuproine-chloroform extraction photometric method for the determination of copper content
Chinese Name:	钢铁及合金化学分析方法 新亚铜灵-三氯甲烷萃取光度法测定铜量
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
Issued by:	CSBTS
Issued on:	1989-03-31
Implemented on:	1990-7-1
Status:	valid
Superseding:	GB 223.19-1982
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	30.0
Delivery:	via email in 1 business day

1 Subject Content and Application Scope This standard specifies the determination of copper content with the neocuproine-chloroform extraction photometric method. This standard is applicable to determination of copper content in the pig iron, carbon steel, alloy steel, high temperature alloy and precious alloy. Determination range: 0.010% ~1.00%. 2 Method Summary Dissolve sample with acid, reduce copper into univalence with hydroxylamine hydrochloride if citric acid is available, in the range of pH 5~6, neocuproine and copper produce the 2:1 insoluble yellow complex compound, extract it with chloroform, and measure its absorbance. Chromium has negative interference if it is larger than 4mg in the extraction solution and other common coexisting elements all are free from interference.

1 Subject Content and Application Scope 2 Method Summary 3 Reagents 4 Analytical Procedure 5 Calculation of Analytical Result 6 Precision Additional Explanation