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FAAS Determination of Trace Amounts of Zinc in Water Samples with Cloud Point Extraction

He Lu

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Abstract

Trace amount of Zn(Ⅱ) was separated and enriched from the sample solution buffered at pH 7.0 with phosphate buffer in the form of a coordination complex with PAN by cloud point extraction using OP-8 as non-ionic surfactant.An aliquot of the surfactant phase was taken and dissolved in HCl solution and its zinc content was determinaed by FAAS.Factors influential to cloud point extraction,and interferences of co-existing ions were studied and optimized.Detection limit(3σ) of the method was found to be 2.4 μg·L-1.The proposed method was applied to the determination of zinc in water samples,and values of recovery obtained by standard addition method were in the range of 95.0%-103.6%.

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What this paper is about

Trace amount of Zn(Ⅱ) was separated and enriched from the sample solution buffered at pH 7.0 with phosphate buffer in the form of a coordination complex with PAN by cloud point extraction using OP-8 as non-ionic surfactant.An aliquot of the surfactant phase was taken and dissolved in HCl solution and its zinc content was determinaed by FAAS.Factors influential to cloud point extraction,and interferences of co-existing ions were studied and optimized.Detection limit(3σ) of the method was found to be 2.4 μg·L-1.The proposed method was applied to the determination of zinc in water samples,and values of recovery obtained by standard addition method were in the range of 95.0%-103.6%.

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Available abstract

Trace amount of Zn(Ⅱ) was separated and enriched from the sample solution buffered at pH 7.0 with phosphate buffer in the form of a coordination complex with PAN by cloud point extraction using OP-8 as non-ionic surfactant.An aliquot of the surfactant phase was taken and dissolved in HCl solution and its zinc content was determinaed by FAAS.Factors influential to cloud point extraction,and interferences of co-existing ions were studied and optimized.Detection limit(3σ) of the method was found to be 2.4 μg·L-1.The proposed method was applied to the determination of zinc in water samples,and values of recovery obtained by standard addition method were in the range of 95.0%-103.6%.

Key concepts: Cloud point, Extraction (chemistry), Zinc, Chemistry, Detection limit, Pulmonary surfactant, Trace Amounts, Phosphate

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