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1983•Acta Chimica SinicaRequires access

POLAROGRAPHIC CATALYTIC WAVE OF COBALT ION IN PHENANTHROLINE-THIOUREA MEDIUM

Zhengchuang Zhao

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Abstract

In 8×10~(-7) M phenanthroline-0.02M thiourea medium(ethanolamine buffer,pH 8.3), by using Na_2SO_3 to remove dissolved oxygen, cobaltion can produce a sensitive catalytio wave with a peak shape on d polarography. E_p=1.62V (vs. S. C. E. ), detection limit is 1×10~(-10)M. There is a linear dependence of peak height on cobalt concentration over a range of 2×10~(-10)～4×10~(-8)M. Common ions which are not more than 1000-fold of Co~(2+) do not interfere the determination of cobalt, except Ni~(2+) and As~(3+) which are permitted to only 125 and 300-fold respectively. Good results are obtained in determining traces of cobalt in various samples by this method.

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What this paper is about

In 8×10~(-7) M phenanthroline-0.02M thiourea medium(ethanolamine buffer,pH 8.3), by using Na_2SO_3 to remove dissolved oxygen, cobaltion can produce a sensitive catalytio wave with a peak shape on d polarography. E_p=1.62V (vs. S. C. E. ), detection limit is 1×10~(-10)M. There is a linear dependence of peak height on cobalt concentration over a range of 2×10~(-10)～4×10~(-8)M. Common ions which are not more than 1000-fold of Co~(2+) do not interfere the determination of cobalt, except Ni~(2+) and As~(3+) which are permitted to only 125 and 300-fold respectively. Good results are obtained in determining traces of cobalt in various samples by this method.

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Available abstract

In 8×10~(-7) M phenanthroline-0.02M thiourea medium(ethanolamine buffer,pH 8.3), by using Na_2SO_3 to remove dissolved oxygen, cobaltion can produce a sensitive catalytio wave with a peak shape on d polarography. E_p=1.62V (vs. S. C. E. ), detection limit is 1×10~(-10)M. There is a linear dependence of peak height on cobalt concentration over a range of 2×10~(-10)～4×10~(-8)M. Common ions which are not more than 1000-fold of Co~(2+) do not interfere the determination of cobalt, except Ni~(2+) and As~(3+) which are permitted to only 125 and 300-fold respectively. Good results are obtained in determining traces of cobalt in various samples by this method.

Key concepts: Polarography, Chemistry, Cobalt, Thiourea, Phenanthroline, Ethanolamine, Ion, Detection limit

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POLAROGRAPHIC CATALYTIC WAVE OF COBALT ION IN PHENANTHROLINE-THIOUREA MEDIUM — Research Paper | ScholarLens