Copper(II) complexes of N-(phosphonomethyl)glycine in aqueous solution: a thermodynamic and spectrophotometric study

被引：63

作者：

Daniele, PG ^{[1
]}

DeStefano, C ^{[1
]}

Prenesti, E ^{[1
]}

Sammartano, S ^{[1
]}

机构：

[1] UNIV MESSINA,DIPARTIMENTO CHIM INORGAN CHIM ANALIT & CHIM FIS,I-98166 MESSINA,VILL S AGATA,ITALY

来源：

TALANTA | 1997年 / 45卷 / 02期

关键词：

copper(II); spectrophotometry; aqueous solution;

D O I：

10.1016/S0039-9140(97)00156-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Copper(II) complexes with the herbicide N-(phosphonomethyl)glycine (glyphosate) have been investigated in aqueous solution by means of pH-metric measurements at different temperatures, 5 less than or equal to T less than or equal to 45 degrees C, calorimetry and visible spectrophotometry. Potentiometric data, at all the considered temperatures in the range 2.5 less than or equal to pH less than or equal to 10.5, can be explained assuming the formation of the species CuLH0, CuL-, CuLH-12-, CuL2-4- and Cu2L+ By using thermodynamic data and calculated electronic spectra for each complex a structural definition is proposed for the different species. Copper(II)-glyphosate complexes are quite stable and must be taken into account in the speciation of natural fluids. (C) 1997 Elsevier Science B.V.

引用

页码：425 / 431

页数：7

共 19 条

[1] Speciation of N-(phosphonomethyl)glycine (glyphosate) in aqueous solutions containing major components of natural fluids [J].