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Development of Dispersive Liquid‐Liquid Microextraction Based on Solidification of Floating Organic Drop for the Determination of Trace Cobalt in Water Samples
Author(s) -
Zhang JingWen,
Ke XiaoJing,
Wang YuKun,
Du Xin,
Ma JingJun,
Li JingCi
Publication year - 2011
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201190144
Subject(s) - chemistry , calibration curve , cobalt , detection limit , certified reference materials , drop (telecommunication) , extraction (chemistry) , chromatography , trace amounts , analytical chemistry (journal) , atomic absorption spectroscopy , liquid liquid , enrichment factor , ionic strength , ionic liquid , aqueous solution , inorganic chemistry , medicine , telecommunications , physics , alternative medicine , pathology , quantum mechanics , computer science , biochemistry , catalysis
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 linearin the range of 1.15‐110 μg L −1 with a detection limit of 0.35 μg L −1 . The relative standard deviation for ten replicate measurements of 10 and 100 μg 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.