title: Extraction of organophosphorus pesticides in water and juice using ultrasound-assisted emulsification-microextraction.
abstract: In this study, a microextraction method termed as ultrasound-assisted emulsification-microextraction (USAEME) has been developed for the extraction of organophosphorus pesticides (OPPs) in water and orange juice samples. In the USAEME method, aliquots of 50 microL chlorobenzene used as extraction solvent was added to 10 mL water sample in a conical glass centrifugal tube. Factors influencing the USAEME extraction efficiency such as sonication time, extraction solvent, extraction volume and salt addition were evaluated. Under the optimum conditions, enrichment factors ranged from 241 to 311, LOD varied from 5.3 to 10.0 ng/L and linearity with a coefficient of estimation (r(2)) varied from 0.9991 to 0.9998 in the concentration level range of 0.05-2.5 microg/L for the extraction of OPPs in water samples. Finally, the proposed USAEME method was used for the extraction of OPPs from water and orange juice. The recoveries were in the range of 80.0-110.0%, and the repeatability of the method expressed as RSD (n=3) varied between 1.6 and 13%. The USAEME method has the advantage of being easy to operate, low consumption of organic solvent and high extraction efficiency.
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Science, Beijing, PR China.
authors.forename: Chunhong
authors.initials: C
authors.lastname: Jia
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Zhu
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Min
authors.initials: M
authors.lastname: He
authors.forename: Pingzhong
authors.initials: P
authors.lastname: Yu
authors.forename: Ercheng
authors.initials: E
authors.lastname: Zhao
mesh_terms: D001628:Beverages / Q000032:analysis*; D002498:Centrifugation; D005591:Chemical Fractionation / Q000379:methods*; D002722:Chlorobenzenes / Q000737:chemistry; D002849:Chromatography, Gas; D002957:Citrus / Q000737:chemistry; D004655:Emulsions; D009943:Organophosphorus Compounds / Q000032:analysis / Q000302:isolation & purification*; D010573:Pesticide Residues / Q000032:analysis / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012492:Salts / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013997:Time Factors; D014465:Ultrasonics; D014867:Water / Q000032:analysis*
chemical_list: D002722:Chlorobenzenes; D004655:Emulsions; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D012492:Salts; D012997:Solvents; D014867:Water; C031294:chlorobenzene