Standard No.:	GB/T 223.25-1994
Chinese Name:	钢铁及合金化学分析方法 丁二酮肟重量法测定镍量
English Name:	Methods for chemical analysis of iron, steel and alloy.The dimethylglyoxime gravimetric method for the determination of nickel content
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1994-01-17
Implemented on:	1994-10-01
Status:	VALID
Replace:	GB223.25-1984
Language:	English
File Format:	PDF
Word Count:	2500 words
Price(USD):	75 (USD)
Delivery:	via email in 1-3 business day

1 Subject Content and Application Scope
This standard specifies a dimethylglyoxime gravimetric method for the determination of nickel content.
This standard is applicable to the determination of nickel content in carbon steel, alloy steel, high temperature alloy and precision alloy. Determination range: above 2%.
2 Principle
Reduction of iron to divalent with sodium sulfite in the ammonium acetate buffer solution. Using tartaric acid as complexing agent, precipitation of nickel and dimethylglyoxime, at 6.0~6.4 pH value, and separation from such elements as iron, cobalt, copper, manganese, chromium, molybdenum, tungsten and vanadium. weighing nickel dimethylglyoxime dried to constant mass at 145 ±5℃.
3 Reagents