Comparison of Two Procedures for Extraction and Clean-up of Organophosphorus and Pyrethroid Pesticides in SedimentEnglish Full Text

WANG Li-Gang, JIANG Xin, YAN Dong-Yun, S. FORSTER and D. MARTENS Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: lgwang0827@yahoo.com.cn Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125 (China) Institute of Ecological Chemistry, National Research Center for Environment and Health, Neuherberg 85764 (Germany)

Abstract: 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.

Keywords：

extraction procedure; organophosphorus pesticides; pyrethroid pesticides; sediments;

Series：
(D) Agriculture; (B) Chemistry/ Metallurgy/ Environment/ Mine Industry
Subject：
Organic Chemical Industry
Classification Code：
TQ453

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Comparison of Two Procedures for Extraction and Clean-up of Organophosphorus and Pyrethroid Pesticides in SedimentEnglish Full Text

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