Development of Microchip-based Cloud Point Extraction System and Application to the Determination of Trace Metal in WaterChinese Full Text
ZHOU Xiao;JIA Geng;ZHANG Xun;LI Xi-qian;LU Li-jun;ZHAO Yun-hui;Jilin Exit-Entry Inspection and Quarantine Bureau;China-Japan Union Hospital,Jilin University;
Abstract: In this work,cloud point methodology was successfully employed for the preconcentration of trace level of zinc（ Zn）,cobalt（ Co）,nickel（ Ni）,and lead（ Pb）. The method was based on the formation of extractable complexes of Zn,Co,Ni,and Pb with L-cysteine as the chelating reagent and poly（ ethylene glycol） mono-p-nonylphenyl ether（ PONPE7. 5） as the surfactant. Combined with flame atomic absorption spectrometry,the chemical variables affecting the cloud point extraction were optimized for the best extraction efficiency. Under the optimum conditions（ pH 8. 0; chelating agent concentration 2. 67 × 10- 4mol /L; surfactant concentration0. 33 g /L; equilibration temperature 30 ℃; incubation time 20min）,limits of detection were 1. 2,1. 5,1. 6,and 2. 8 μg /L for Zn,Co,Ni and Pb,respectively,with relative standard deviations（ RSD） in the range of 2. 0% 4. 3%. The developed method was applied to the determination of trace Zn,Co,Ni,and Pb in environmental water and fruit juice samples with recovery results of 80% 106%.
- DOI：
10.13822/j.cnki.hxsj.2014.07.013
- Series：
- Subject：
- Classification Code：
O657.31
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