title: Preconcentration sensitive determination of pyrethroid insecticides in environmental water samples with solid phase extraction with SiO2 microspheres cartridge prior to high performance liquid chromatography.
abstract: Present study developed a new method for the sensitive determination of pyrethroid insecticides with solid phase extraction in combination with high performance liquid chromatography and UV detector. SiO(2) microspheres, a new SiO(2) based material, was investigated for the enrichment ability and applicability as the solid phase extraction sorbent. Four pyrethroid pesticides such as fenpropathrin, cyhalothrin, fenvalevate and biphenthrin were used as the target analytes. Parameters that maybe influence the extraction efficiency such as the eluent type and its volume, sample flow rate, sample pH, and the sample volume were optimized in detail, and the optimal conditions were as followed: sample volume, 100mL; concentration of methanol, 30%; acetone volume, 5mL; sample flow rate, 4.2mLmin(-1); sample pH, 7. The experimental results indicated that there was good linearity in the concentration range of 0.1-50microgL(-1) except biphenthrin in the range of 0.05-25microgL(-1). The detection limits for fenpropathrin, cyhalothrin, fenvalevate and biphenthrin were in the range of 0.02-0.08microgL(-1). The intra-day and day to day precisions (RSDs, n=6) were in the ranges of 2.6-4.4% and 5.3-7.2%, respectively. The method was validated with five real environmental water samples, and all these results proved that proposed method could be used as a good alternative for the routine analysis for such pollutants in environmental samples.
authors.affiliation: School of Chemistry and Environmental Sciences, Henan Normal University, Henan Key Laboratory for Environmental Pollution Control, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Xinxiang 453007, China. zhouqx@cup.edu.cn
authors.forename: Qingxiang
authors.initials: Q
authors.lastname: Zhou
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Gao
authors.forename: Huahua
authors.initials: H
authors.lastname: Bai
authors.forename: Guohong
authors.initials: G
authors.lastname: Xie
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D007306:Insecticides / Q000032:analysis*; D057230:Limit of Detection; D011722:Pyrethrins / Q000032:analysis*; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007306:Insecticides; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide