液相微萃取-高效液相色谱法在一些农兽药残留研究中的应用-application of liquid phase microextraction - high performance liquid chromatography in the research of some veterinary drug residues.docxVIP

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液相微萃取-高效液相色谱法在一些农兽药残留研究中的应用-application of liquid phase microextraction - high performance liquid chromatography in the research of some veterinary drug residues.docx

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液相微萃取-高效液相色谱法在一些农兽药残留研究中的应用-application of liquid phase microextraction - high performance liquid chromatography in the research of some veterinary drug residues

levels were 84.9%, 91.4% and 95%, with the RSDs ranging from 4.6% to 6.3%. The method was simple, sensitive, and was easy to use for the determination of clenbuterol in pork.( 3 ) A new HF-LPME method coupled with HPLC-fluorescence detection ( FD ) method was developed for the determination of carbendazim ( MBC ) and thiabendazole ( TBZ ) in apple juice. Some important extraction parameters, such as the pH of the sample solution, extraction time, stirring rate and salt concentration were optimized. As a result, the optimal HF-LPME conditions were selected as follows: the pH of sample solution (donor phase) was 7.5, the pores of the hollow fiber were impregnated by 1-octanol, and 5 mM HCl ( pH=2.5 ) was used as the extraction solvent. The extractions were conducted for 40 min at a stirring rate of 800 rpm. After extraction, 10 μL of the extraction solvent was injected into the HPLC system for analysis. The average enrichment factors were 106 and 114 for MBC and TBZ, respectively. The linear relationship existed in the range of 2.5 ~500 μg/L and 5 ~ 500 μg/L for MBC and TBZ in apple juice with the correlation coefficients ( r ) of 0.9995 and 0.9991, respectively. The detection limits were 0. 8 μg/L for MBC and 1.5 μg/L for TBZ ( S/N = 3:1 ). The recoveries were between 86.3% and 106.0% with the RSDs ranging from 3.3% to 11.5%. The HF-LPME-HPLC method has been successfully applied to the analysis of MBC and TBZ in apple juice, indicating that LPME-HPLC may be a promising combination for the analysis of pesticide residues for some food matrix samples.( 4 ) A novel method for the determination of five carbamate pesticides ( metolcarb, carbofuran, carbaryl, isoprocard and diethofencard ) in water, watermelon and tomato samples was developed by DLLME coupled with HPLC-diode array detector ( HPLC-DAD ). Some experimental parameters that influence the extraction efficiency were studied and optimized to obtain the best extraction results. Under the optimum conditions