Dissipation and Residues of Chlormequat in Wheat and Soil

A specific, sensitive method was developed for the analysis of chlormequat in wheat and soil by high performance chromatography/mass spectrometry. The fortified recoveries of soil were from 75.08% to 96.55%, with RSD 3.34%-15.18%, the limit of detection of the analytical method was 0.05 ng at a sign...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 2010-02, Vol.84 (2), p.221-224
Main Authors: Guo, Xing-li, Jia, Chun-hong, Zhao, Er-cheng, Xu, Yan-jun, Han, Li-jun, Jiang, Shu-ren
Format: Article
Language:English
Subjects:
Aquatic Pollution
Cereal crops
China
Chlormequat - analysis
Chromatography
Chromatography, High Pressure Liquid
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Flour - analysis
Grain
Half-Life
Mass Spectrometry
Pesticide residues
Pesticide Residues - analysis
Pesticides
Plant Growth Regulators - analysis
Pollution
Reference Standards
Seeds - chemistry
Soil - analysis
Soil contamination
Soil Pollutants - analysis
Soil Science & Conservation
Soils
Toxicology
Triticum - chemistry
Triticum - metabolism
Triticum aestivum
Waste Water Technology
Water Management
Water Pollution Control
Wheat
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Summary:A specific, sensitive method was developed for the analysis of chlormequat in wheat and soil by high performance chromatography/mass spectrometry. The fortified recoveries of soil were from 75.08% to 96.55%, with RSD 3.34%-15.18%, the limit of detection of the analytical method was 0.05 ng at a signal-to-noise ratio of 3, and the limit of quantification was 0.05, 0.1, 0.5 mg/kg for soil, wheat plants and wheat grain, respectively. The degradation dynamics and final residues of chlormequat in Beijing and Changchun were investigated. The half-life of chlormequat in wheat plants were 3.15 days in Beijing and 4.56 days in Changchun, while the half-life in soil was 3.88 days in Beijing and 4.51 days in Changchun. The final residues of chlormequat in soil were not detectable, and the final residues of chlormequat in wheat grain were below 0.50 mg/kg except for 3.51 mg/kg from high dosage plot of Changchun. The fact that all the final residues were below 5 mg/kg (GB2763 in National standards of the People's Republic of China, maximum residue limits for pesticide in food, Beijing, 2005) suggested that chlormequat could be safely used in wheat crops with the suitable dosage and application.
ISSN:0007-4861
1432-0800
DOI:10.1007/s00128-009-9920-4