Chemical amplification method for the polarographic determination of trace amounts of Boron

Kannan, R and Ramakrishna, TV and Rajagopalan, SR (1986) Chemical amplification method for the polarographic determination of trace amounts of Boron. Indian Journal of Technology, 24 (8). pp. 482-484.

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Abstract

It is shown that boron can be estimated by dc polarography at mu g/ ml level by using two chemical amplification reactions in sequence. In this method, boron is converted into molybdotungstoboric acid by its reaction with ammonium molybdate and sodium tungstate under suitable conditions and is separated by solvent extraction. Determination of molybdenum in the organic extract gives an indirect estimation of boron with an enhancement factor of 6. A further enhancement by a factor of 40 is achieved by determining molybdenum through catalytic dc polarography in nitrate medium. With the overall enhancement factor of 240 and with the use of charging current compensation to minimize the background, the detection limit for boron is 0. 25 mu g/ml and the relative standard deviation is 5% (at 20 mu g level).

Item Type: Article
Uncontrolled Keywords: Acids-Concentration;Ammonium compounds-Solutions;Chemical reactions-Reaction Kinetics;Metals and alloys-trace analysis;Chemical amplification method;Molybdotungstoboric acid;Sodium tungstate;Boron
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Users 11 not found.
Date Deposited: 03 Jun 2008
Last Modified: 24 May 2010 04:08
URI: http://nal-ir.nal.res.in/id/eprint/457

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