An ATR-FTIR study of glyphosate and its Fe(III) complex in aqueous solution

被引：80

作者：

Barja, BC ^{[1
]}

Afonso, MD ^{[1
]}

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Inquimae Dept Quim Inorgan Analit & Quim Fis, RA-1428 Buenos Aires, DF, Argentina

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1998年 / 32卷 / 21期

关键词：

D O I：

10.1021/es9800380

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

An ATR-FTIR study of the vibrational spectrum of glyphosate (N-phosphonomethylglycine) in aqueous solution 1 M in NaCl is reported. Band assignments are given in the 1800-850 cm(-1) range based on the analysis of the spectral changes from low to high pH values (2-11). Potentiometric titrations of glyphosate are performed at 0.1, 0.5, and 1 M ionic strengths in NaCl and the pK(a2), pK(a3), and pK(a4) values determined. A chemometric analysis of the spectral data has been carried out to support the assignments and reproduce the pK(a) values. In addition, the ATR-FTIR spectrum of the 1:1 Fe(III)/glyphosate complex in aqueous solution is analyzed by comparison with that of the free ligand.

引用

页码：3331 / 3335

页数：5

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