Pedosphere 14(2): 229--234, 2004
ISSN 1002-0160/CN 32-1315/P
©2004 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Comparison of two procedures for extraction and clean-up of organophosphorus and pyrethroid pesticides in sediment
WANG Li-Gang1,2, JIANG Xin1, YAN Dong-Yun1, S. FORSTER3 and D. MARTENS3
1 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail:
2 Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125 (China)
3 Institute of Ecological Chemistry, National Research Center for Environment and Health, Neuherberg 85764 (Germany)
      Two procedures were compared for extraction and clean-up of 20 organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedure for groups of pesticides or individual compounds. In Procedure Ⅰ, methanol/water and n-hexane were used for extraction, and 1:10 (v/v) dichloromethane in n-hexane and acetone were used as eluents for eluting the analyte through the cartridge, with one evaporating steps on a rotary evaporator and two eluting steps on the cartridge, n-hexane/acetone (2:1, v/v) was used for extraction and elution in Procedure Ⅱ with one evaporating step on a rotary evaporator and one eluting step on the cartridge. All extractions were performed under an ultrasonic bath and gas chromatography and mass spectrometry were utilized for measurements. Procedure Ⅱ was developed as a rapid, timesaving, less costly and safer substitute for Procedure Ⅰ which was an old method. Procedure Ⅱ was more effective for almost all the organophosphorus pesticides tested and 11 of the 19 pyrethroid pesticides, while Procedure I was more appropriate for analysis of 5 pyrethroid pesticides. However, recoveries of most pyrethroid pesticides were fairly low. Thus, further studies should focus on adjustment and formulation of solvents for more efficient extraction and clean-up of pyrethroid pesticides from sediment samples.
Key Words:  extraction procedure, organophosphorus pesticides, pyrethroid pesticides, sediments
Citation: Wang, L. G., Jiang, X., Yan, D. Y., Forster, S. and Martens, D. 2004. Comparison of two procedures for extraction and clean-up of organophosphorus and pyrethroid pesticides in sediment. Pedosphere. 14(2): 229-234.
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