Ion chromatography/inductively coupled plasma mass spectrometry for simultaneous determination of glyphosate, glufosinate, fosamine and ethephon at nanogram levels in water.
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.
Guo
Zhong-Xian
ZX
Centre for Advanced Water Technology, Singapore Utilities International, 80/82 Toh Guan Road East, Singapore 608575, Singapore.
Cai
Qiantao
Q
Yang
Zhaoguang
Z
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
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