A method based on cloud point extraction (CPE) separation/preconcentration of trace cadmium (Cd) as a prior step to its determination by flame atomic absorption spectrometry has been developed. Cadmium reacted with 8-hydroxyquinoline to form hydrophobic chelates, which were extracted into the micelles of nonionic surfactant oligoethylene glycol monoalkyl ether (Genapol X-080) in an alkaline medium. Octanol was used to depress the cloud point of Genapol X-080 in the extraction process. The chemical variables that affect the CPE, such as pH of complexation reaction, amount of chelating agent, Genapol X-080 and octanol were evaluated and optimized. Under optimized conditions, linearity was obeyed in the range of 10–500 μg/L, with the correlation coefficient of 0.9993. For 5 mL of sample solution, the enhancement factor was about 20. The limit of detection and limit of quantification of the method were 0.21 and 0.63 μg/L, respectively. The relative standard deviations (n = 6) was 3.2% for a solution containing 100 μg/L of Cd. The accuracy of the preconcentration system was evaluated by recovery measurements on spiked water samples. Recoveries of spiked samples varied in the range of 94.1–103.8%.
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Research Article|
June 13 2014
Cloud point extraction–flame atomic absorption spectrometry method for preconcentration and determination of trace cadmium in water samples Available to Purchase
Jinyan Ning;
Jinyan Ning
1Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China
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Yang Jiao;
Yang Jiao
2College of Architecture and City Planning, University of Wisconsin Madison, Madison, WI 53706, USA
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Jiao Zhao;
Jiao Zhao
1Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China
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Lifen Meng;
Lifen Meng
1Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China
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Yaling Yang
1Faculty of Life Science and Technology, Kunming University of Science and Technology, Yunnan Province 650500, China
E-mail: [email protected]
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Water Sci Technol (2014) 70 (4): 605–611.
Article history
Received:
October 19 2013
Accepted:
May 28 2014
Citation
Jinyan Ning, Yang Jiao, Jiao Zhao, Lifen Meng, Yaling Yang; Cloud point extraction–flame atomic absorption spectrometry method for preconcentration and determination of trace cadmium in water samples. Water Sci Technol 1 August 2014; 70 (4): 605–611. doi: https://doi.org/10.2166/wst.2014.263
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