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Determination of Trace Cobalt in Samples by Flame Atomic Absorption Spectrometry After Cloud Point Extraction

Xuli Pu

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Abstract

A new method for determination of trace cobalt in samples by flame atomic absorption spectrometry after cloud point extraction was developed.The cloud point extraction system was based on Triton X-114 as surfactant and ammonium pyrrolidyldithiocarbamate(APDC) as chelating agent.The parameters affecting cloud point extraction including pH,amount of Trion X-114,concentration of APDC,extraction temperature and time were optimized.The detection limit(3σ) was 2.6 μg/L,relative standard deviation was 6.2%(n=7,c=200μg/L) under the optimized conditions.The proposed method was successfully applied to the determination of trace cobalt in samples such as kelp and injection of vitamin B12.

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What this paper is about

A new method for determination of trace cobalt in samples by flame atomic absorption spectrometry after cloud point extraction was developed.The cloud point extraction system was based on Triton X-114 as surfactant and ammonium pyrrolidyldithiocarbamate(APDC) as chelating agent.The parameters affecting cloud point extraction including pH,amount of Trion X-114,concentration of APDC,extraction temperature and time were optimized.The detection limit(3σ) was 2.6 μg/L,relative standard deviation was 6.2%(n=7,c=200μg/L) under the optimized conditions.The proposed method was successfully applied to the determination of trace cobalt in samples such as kelp and injection of vitamin B12.

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Available abstract

A new method for determination of trace cobalt in samples by flame atomic absorption spectrometry after cloud point extraction was developed.The cloud point extraction system was based on Triton X-114 as surfactant and ammonium pyrrolidyldithiocarbamate(APDC) as chelating agent.The parameters affecting cloud point extraction including pH,amount of Trion X-114,concentration of APDC,extraction temperature and time were optimized.The detection limit(3σ) was 2.6 μg/L,relative standard deviation was 6.2%(n=7,c=200μg/L) under the optimized conditions.The proposed method was successfully applied to the determination of trace cobalt in samples such as kelp and injection of vitamin B12.

Key concepts: Cloud point, Extraction (chemistry), Detection limit, Chemistry, Cobalt, Analytical Chemistry (journal), Trace Amounts, Chromatography

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