期刊
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
卷 58, 期 7, 页码 911-918出版社
CHINESE CHEMICAL SOC
DOI: 10.1002/jccs.201190144
关键词
Dispersive liquid-liquid microextraction; Solidification of floating organic drop; Flame atomic absorption spectrometry; Preconcentration; Cobalt
资金
- Development Foundation of the Department of Education of Hebei Province, P. R. China [2007121]
- Research Development Foundation of the Agricultural University of Hebei
A liquid-phase microextraction technique was developed using dispersive liquid-liquid microextraction based on solidification of floating organic drop combined with flame atomic absorption spectrometry, for the extraction and determination of trace amounts of cobalt in water samples. Microextraction efficiency factors, such as the type and volume of extraction and dispersive solvents, pH, extraction time, the chelating agent amount, and ionic strength were investigated and optimized. Under optimum conditions, an enrichment factor of 160 was obtained from 10.0 mL of water sample. The calibration graph was linear in the range of 1.15-110 mu g L-1 with a detection limit of 0.35 mu g L-1.The relative standard deviation for ten replicate measurements of 10 and 100 mu g L-1 of cobalt were 3.26% and 2.57%, respectively. The proposed method was assessed through the analysis of certified reference water or recovery experiments.
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