Determination of some thiophosphorus insecticides based on coulometric titration with the anodically generated chlorine: a further insight in the reaction mechanism in aqueous medium

被引：3

作者：

Ciesielski, W

Skowron, M

Balczewski, P

Szadowiak, A

机构：

[1] Univ Lodz, Dept Instrumental Anal, PL-90236 Lodz, Poland

[2] Polish Acad Sci, Ctr Mol & Macromol Studies, Lab Metallo & Matalloidoorgan Chem, Dept Heteroorgan Chem, PL-90363 Lodz, Poland

[3] Pedag Univ, PL-42200 Czestochowa, Poland

来源：

TALANTA | 2003年 / 60卷 / 04期

关键词：

chlorocoulometric titration; phosphorothionates and phosphorothiolates insecticides; mechanistic pathways;

D O I：

10.1016/S0039-9140(03)00129-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new method of analytical determination of some thiolo (P-S) and thiono (P=S) group containing phosphorus insecticides using a coulometric titration with the anodically generated chlorine and biamperometric end-point detection was described. The method worked well for compounds containing one (methamidophos) or two P-S bonds (iso-malathion) or one P=S bond (fenitrothion) but failed for compounds containing both P-S and P=S bonds (malathion, dimethoate) or additional sterically hindered C-S-C bond (fenthion). Based on the found number z of electrons transferred per mol of oxidized compounds, mechanistic pathways for chlorination of P-S and P S containing thiophosphorus insecticides with molecular chlorine in aqueous, acidic medium were proposed. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：725 / 732

页数：8