A simple and sensitive method has been developed and validated for the determination of abamectin B1a (ABA B1a), emamectin B1a (EMA B1a) benzoate and ivermectin H2B1a (IVM H2B1a) in soils. The avermectins
(AVMs) residues were extracted from soils with acetonitrile/water (9 : 1, v/v) and then were purified on C18 solid-phase extraction (SPE) cartridge. After being derivatised by N-methylimidazole (N-MIM) and trifluoroacetic anhydride (TFAA), the residues
of three AVMs were analysed by high-performance liquid chromatography with fluorescence detection (HPLC-FLD). The method was validated in terms of system suitability, linearity, selectivity, precision, recovery, specificity and stability. There was a good linear relationship (R
2 > 0.99)
for three AVMs ranged from 0.01 to 5 µg mL−1. The LOD and LOQs of ABA B1a, EMA B1a benzoate and IVM H2B1a for standard solutions were 1.1–1.7 and 3.6–5.7 µg L−1
respectively. The accuracy of AVMs in soils was from 83.7 to 115.5% with precision less than or equal to 12.4%. Using the developed method, 9 soil samples with 9.3–12806.3 µg kg−1 of AVMs residues had been detected.
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high-performance liquid chromatography (HPLC);
Document Type: Research Article
State Key Laboratory of Pollution Control and Resource Reuse,Center for Hydrosciences Research, School of the Environment, Nanjing University, Nanjing 210093, P. R. China
Zhejiang Agriculture & Forestry University, Hangzhou, 310018, P. R. China
Shanghai Agricultural Extension and Service Center, Shanghai 201103, P. R. China
October 15, 2012
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