Standard No.:	GB/T 223.50-1994
Chinese Name:	钢铁及合金化学分析方法 苯基荧光酮-溴化十六烷基三甲基胺直接光度法测定锡量
English Name:	Methods for chemical analysis of iron, steel and alloy The phenylfuorone-CTMAB direct photometric method for the determination of tin content
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1994-09-26
Implemented on:	1995-06-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Subject Content and Application Scope

This Standard specifies Phenylfluorone-CTMAB direct photomctric method for determination of tin content.
This Standard is applicable to determination of tin in pig iron, carbon steel and low alloyed steel. The tin content range by determination is as: 0.0050%~0.20%.

2 Principle

In medium of diluted sulfuric acid, tin (IV) with phenylfluorone and CTMAB forms multiads, showing stable orange red, and measure the absorbance with spectrophotometer at a wave length of 536nm.
There is no effect when the content of wolfram, molybdenum and titanium in the developing solution shall respectively be less than 10μg, the content of niobium shall be less than 5μg, and the content of tantalum shall be less than μg.