A simple and rapid spectrophotometric method to quantify the herbicide glyphosate in aqueous media. Application to adsorption isotherms on soils and goethite

被引：55

作者：

Waiman, Carolina V. ^{[1
]}

Avena, Marcelo J. ^{[1
]}

Garrido, Mariano ^{[1
]}

Fernandez Band, Beatriz ^{[1
]}

Zanini, Graciela P. ^{[1
]}

机构：

[1] Univ Nacl Sur, Dept Quim, INQUISUR, RA-8000 Bahia Blanca, Buenos Aires, Argentina

来源：

GEODERMA | 2012年 / 170卷

关键词：

Glyphosate; Quantification; UV; Isotherm; Soil; Goethite; PERFORMANCE LIQUID-CHROMATOGRAPHY; TANDEM MASS-SPECTROMETRY; AMINOMETHYLPHOSPHONIC ACID; RESIDUE DETERMINATION; GAS-CHROMATOGRAPHY; WATER; GLUFOSINATE; SORPTION; SAMPLES; DERIVATIZATION;

D O I：

10.1016/j.geoderma.2011.11.027

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

This article presents a simple, fast and low cost UV-vis spectrophotometric method to quantify glyphosate. This method can be used to perform adsorption isotherms on soils and metal oxides. It comprises a derivatization step and further measurement of the absorbance at 265 nm. The trueness of the results is validated using Ultra Performance Liquid Chromatography with tandem mass spectrometry detection (UPLC-MS/MS) as a reference method. The proposed spectrophotometric method is able to quantify glyphosate in the concentration range from 0.084 to 21.8 mg L-1. This range is suitable to construct reliable adsorption isotherms. Examples of adsorption isotherms on goethite at pH 4.5 and a soil sample at pH 4.5, 6.0 and 8.0 are given. Interferences caused by dissolved organic matter can be corrected at least up to an organic matter concentration of 12 mg L-1. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：154 / 158

页数：5