オクタデシルシリル化シリカディスクを用いる微量鉛のイオン対抽出/蛍光目視定量

概要

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A rapid and simple method has been developed for the determination of trace lead ion using an octadecylsilanized (ODS) silica disk cartridge. The ion-pair of a lead complex with 5,6-14,15-dibenzo-4,7,13,16,21,24-hexaoxa-1.10-diazabicyclohexacosane (DBC 2.2.2) and tetrabromofluorescein (Eosin Y) was extracted from a sample solution onto an ODS filter at pH7.0. It was found that the addition of 20 wt% ethanol to the sample solution significantly enhanced the solid phase extraction. The lead concentration was determined by visual fluorimetry under ultraviolet light in the dark. The ion-pair has excitation and emission maxima at 530 nm and 560 nm in the solid phase, respectively. When measured with a densitometer, the linear range of this method is up to 2.9×10^-8 mol dm^-3(6 ppb). The detection limit is 5.0×10^-10 mol dm^-3 (100 ppt) by visual determination and 3.4×10^-9 mol dm^-3 (700 ppt) by densitometry. The relative standard deviation for 1.2×10^-3 mol dm^-3 (2.3 ppb) of lead is 5.6% (n=7). The method is essentially free from matrix interference. The proposed method can easily be performed and provides good precision and accuracy.
社団法人日本分析化学会の論文
2002-11-05