Hebei Key Laboratory of Bioinorganic Chemistry, College of Science, Agricultural University of Hebei, Baoding, 071001, Hebei, People's Republic of China.
Biol Trace Elem Res. 2011 Dec;144(1-3):1381-93. doi: 10.1007/s12011-011-9078-x. Epub 2011 May 20.
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 nickel 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, the calibration graph was linear in the range of 4.23-250 μg L(-1) with a detection limit of 1.27 μg L(-1). The relative standard deviation for ten replicate measurements of 10 and 100 μg L(-1) of nickel were 3.21% and 2.55%, respectively. The proposed method was assessed through the analysis of certified reference water or recovery experiments.
建立了一种基于悬浮液液-液微萃取-固-相萃取结合火焰原子吸收光谱法测定水样中痕量镍的方法。考察并优化了萃取效率的影响因素，如萃取和分散溶剂的类型和体积、pH 值、萃取时间、螯合剂用量和离子强度等。在最佳条件下，校准曲线在 4.23-250μg/L 范围内呈线性，检测限为 1.27μg/L。10 和 100μg/L 镍的 10 次重复测量的相对标准偏差分别为 3.21%和 2.55%。通过对标准参考水的分析或回收实验对该方法进行了评估。
