title: Analysis of the plant growth regulator chlormequat in soil and water by means of liquid chromatography-tandem mass spectrometry, pressurised liquid extraction, and solid-phase extraction.
abstract: We present a new, precise and accurate method for quantitative analysis of chlormequat in soil and aqueous matrices. The method, which is based on LC-MS/MS, pressurised liquid extraction and solid-phase extraction, is eminently suitable for studying the fate of chlormequat in the soil environment. The limit of detection is 0.003-0.008 microg/L for rainwater, surface water and groundwater and 0.07-0.4 microg/kg for soil. In water samples amended to 0.04 microg/L, precision is better than 10%. The residual content of chlormequat in three agricultural topsoils analysed 4 months after its application was 23-55 microg/kg (12-23% of the amount applied). No trace of chlormequat was detected in groundwater from 66 water supply wells located in rural areas treated with chlormequat.
authors.affiliation: Department of Geochemistry, Geological Survey of Denmark and Greenland, GEUS, Copenhagen, Denmark. trine.henriksen@rh.regionh.dk
authors.forename: Trine
authors.initials: T
authors.lastname: Henriksen
authors.forename: René K
authors.initials: RK
authors.lastname: Juhler
authors.forename: Gyrite
authors.initials: G
authors.lastname: Brandt
authors.forename: Jeanne
authors.initials: J
authors.lastname: Kjaer
mesh_terms: D002716:Chlormequat / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods*; D003627:Data Interpretation, Statistical; D004355:Drug Stability; D010937:Plant Growth Regulators / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D052616:Solid Phase Extraction / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D010937:Plant Growth Regulators; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002716:Chlormequat