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Ion chromatography/inductively coupled plasma mass spectrometry for simultaneous determination of glyphosate, glufosinate, fosamine and ethephon at nanogram levels in water
Author(s) -
Guo ZhongXian,
Cai Qiantao,
Yang Zhaoguang
Publication year - 2007
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3003
Subject(s) - chemistry , chromatography , ion chromatography , inductively coupled plasma mass spectrometry , mass spectrometry , detection limit , inductively coupled plasma , glufosinate , distilled water , quadrupole mass analyzer , analytical chemistry (journal) , glyphosate , plasma , physics , quantum mechanics , agronomy , biology
This paper describes the first approach that simultaneously quantifies four polar, water‐soluble organophosphorus herbicides, i.e., glyphosate, glufosinate, fosamine and ethephon, at nanogram levels in environmental waters. The target herbicides were separated completely by ion chromatography (IC) on a polymer anion‐exchange column, Dionex IonPac AS16 (4.0 mm × 250 mm), with 30 mM citric acid flowing at 0.70 mL min −1 as the eluent. On‐line inductively coupled plasma mass spectrometry (ICP‐MS) using a quadrupole mass spectrometer was employed as a sensitive and selective detector of the effluents. Various parameters affecting the separation and detection were systematically examined and optimized. Detection limits of the herbicides achieved with the proposed IC/ICP‐MS method were 1.1–1.4 µg L −1 (as compound) based on a 500‐µL sample injection. Matrix anions, metal ions, phosphate, polyphosphates, non‐polar and other polar organophosphorus pesticides showed no interference. The developed method was validated using reservoir water, treated water and NEWater samples spiked at the level of 10–25 µg L −1 with satisfactory recoveries (95–109%). It is applicable to the simultaneous determination of µg L −1 concentrations of the herbicides in polluted water. Copyright © 2007 John Wiley & Sons, Ltd.