An enhancement method for the polarographic13; determination of trace amounts of arsenic

Kannan, R and Rajagopalan, SR (1988) An enhancement method for the polarographic13; determination of trace amounts of arsenic. Technical Report. National Aeronautical Laboratory, Bangalore,India.

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Abstract

A highly sensitive polarographic method has been developed13; for the determination of trace amounts of arsenic by combining two different methods of enhancing the sensitivity. Formation of molybdoarsenic acid complex was chosen as the first enhancement reaction. Determination of the molybdenum content of the molybdoarsenic acid complex by catalytic polarography was chosen as the second enhancement reaction. By combining these two methods, a dramatic improvement in overall sensitivity is achieved. Systematic investigations were carried out for minimising the blank since a low blank value improves' the detection limit. It was found out that by the addition of a small amount of cyclohexane to the organic extract, followed13; by an acidic wash, the blank could be rninimised to a low value.The use of the charging current compensated d.c. polarograph improved the precision. The suitability of the method for trace analysis is demonstrated by determining arsenic in high purity iron and steels. In this procedure arsenic is isolated from the matrix material by estillation as arsenic tri chloride and then determined by polarography.

Item Type:	Monograph (Technical Report)
Uncontrolled Keywords:	Arsenic analysis;Polarographic analysis;Chemical;Amplification,13; Trace analysis.
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials
Depositing User:	M/S ICAST NAL
Date Deposited:	11 Nov 2006
Last Modified:	24 May 2010 04:22
URI:	http://nal-ir.nal.res.in/id/eprint/3112

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