Stopped-flow spectrophotometric determination of nM level of Pb(II) using 5,10,15,20-terakis(1-methylpyridinium-4-yl)porphine

被引：3
作者：
Kawamura, Kunio [1 ]
Igarashi, Shukuro [1 ]
Yotsuyanagi, Takao [1 ]
机构：
[1] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Sendai, Miyagi 9808579, Japan
来源：
MICROCHIMICA ACTA | 2007年 / 157卷 / 1-2期
关键词：
stopped-flow; spectrophotometric determination; lead(II);
D O I：
10.1007/s00604-006-0573-2
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A spectrophotometric determination method for nM levels of Pb(II) has been developed using a stopped-flow spectrophotometer with cationic water-soluble porphyrin. The stopped-flow spectrophotometer allows the monitoring of the incorporation reaction of the Pb( II) ion into 5,10,15,20- terakis(1-methylpyridinium4- yl) porphine (TMPYP) within a narrow time window (2.5 s) at pH 10.5-12.0 before the Pb-TMPYP complex is replaced with other foreign metal ions, since usually the Pb-TMPYP complex is very labile and readily replaced with other metal ions. This improved the selectivity of Pb( II) determination as compared to the conventional spectrophotometric determination of Pb( II) using water-soluble porphyrins.
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收藏
页码：87 / 91
页数：5
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