title: Ion chromatography/inductively coupled plasma mass spectrometry for simultaneous determination of glyphosate, glufosinate, fosamine and ethephon at nanogram levels in water.
abstract: 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 x 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 microg L(-1) (as compound) based on a 500-microL 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 microg L(-1) with satisfactory recoveries (95-109%). It is applicable to the simultaneous determination of microg L(-1) concentrations of the herbicides in polluted water.
authors: Centre for Advanced Water Technology, Singapore Utilities International, 80/82 Toh Guan Road East, Singapore 608575, Singapore.
authors: Zhong-Xian
authors: ZX
authors: Guo
authors: Qiantao
authors: Q
authors: Cai
authors: Zhaoguang
authors: Z
authors: Yang
mesh_terms: D000613:Aminobutyrates / Q000032:analysis; D002138:Calibration; D002219:Carbamates / Q000032:analysis; D002852:Chromatography, Ion Exchange; D005998:Glycine / Q000031:analogs & derivatives / Q000032:analysis; D006540:Herbicides / Q000032:analysis*; D007202:Indicators and Reagents; D009943:Organophosphorus Compounds / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D012015:Reference Standards; D021241:Spectrometry, Mass, Electrospray Ionization; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D000097797:Glyphosate
chemical_list: D000613:Aminobutyrates; D002219:Carbamates; D005998:Glycine; D006540:Herbicides; D007202:Indicators and Reagents; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D014867:Water; D014874:Water Pollutants, Chemical; D000097797:Glyphosate; C003121:phosphinothricin; C019397:fosamine; C005073:ethephon