Kinetic and equilibrium studies on mercury(II)-coproporphyrin-I. Metal ion exchange reaction with cobalt(II) and application to determination of trace mercury(II)

被引：9

作者：

Giovannetti, R

Bartocci, V

机构：

[1] Univ Camerino, Ctr Interdip Grandi Apparecchiature, I-62032 Camerino, Italy

[2] Univ Camerino, Dipartimento Sci Chim, I-62032 Camerino, Italy

来源：

TALANTA | 1998年 / 46卷 / 05期

关键词：

mercury(II); cobalt(II); spectrophotometry; coproporphyrin-1;

D O I：

10.1016/S0039-9140(97)00351-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The reaction of 3,8,13,18-retramethy1-21H,23H-porphine-2,7,12,17-tetrapropionic acid or coproporphyrin-I (CPI) with mercury(II) was studied spectrophotometrically, and kinetic and equilibrium constants were determined; the influence of temperature on the reaction rate was also studied. It was verified that mercury(II) accelerates the incorporation reaction of cobalt(II) into CPI; the kinetics and mechanism of this reaction at high alkaline pH were studied. Sensitive kinetic methods for the determination of mercury(II) at ppb levels have been established: the apparent molar absorbivity and Sandell's sensitivity for the recommended procedure, at 368 nm, and 400 s after the start of the reaction, were: 4.23 x 10(5) (1 mol(-1) cm(-1)) and 0.474 (ng cm(-2)) (for A = 0.001). (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：977 / 984

页数：8

共 18 条

[1]

ATKINS PW, 1990, PHYSICAL CHEM

[2]

BAES C, 1976, HYDROLYSIS CATIONS, P310

[3] Spectrophotometric study of coproporphyrin-I complexes of copper(II) and cobalt(II) [J].