Viorica COSMA (2003) Determination of Ni2+ Impurities Using Cadmium-Selective Electrode

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Determination of Ni2+ Impurities Using Cadmium-Selective Electrode

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CONTRIBUTORS:

Author:

Viorica COSMA

JOURNAL:

Leonardo Journal of Sciences, 2(2), 64 - 71.

YEAR:

2003

PUB TYPE:

Journal Article

SUBJECT(S):

None

DISCIPLINE:

Chemistry

HTTP:

http://ljs.academicdirect.org/A02/64_71.pdf

LANGUAGE:

English

PUB ID:

103-435-526 (Last edited on 2007/06/26 11:14:54 GMT-6)

SPONSOR(S):

ABSTRACT:
Taking into account the use of Nickel brasses in industry a great number of methods for the determination of Ni2+ have been reported. More, theoretical predictions of free Cd2+ increasing with decreasing salinity have been confirmed using cadmium selective electrodes. The method under proposal, for the determination of nickel ions in brass alloys consists of the following steps: Cu2+ masking with sodium thiosulfate; Ni2+ precipitation as nickel-dimethylglyoximate at pH = 5.6 with subsequent selective extraction in chloroform; treatment of the organic phase with HNO3 1M; determination of Ni2+ by titration of the excess of EDTA at pH = 5.6 with a solution of Cd2+, in the presence of the cadmium-selective electrode. The experimental values showed low dispersion and therefore a good precision. The mean value of nickel content from 13 parallel aliquots of the brass sample was 1.79% which agreed well with those obtained by the atomic absorption spectrometry, 1.77%.

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