title: [Determination of biphenyl ether herbicides in water using HPLC with cloud-point extraction].
abstract: OBJECTIVE
  To determine residues of multiple biphenyl ether herbicides simultaneously in water using high performance liquid chromatography (HPLC) with cloud-point extraction.
  
  
  METHODS
  The residues of eight biphenyl ether herbicides (including bentazone, fomesafen, acifluorfen, aclonifen, bifenox, fluoroglycofenethy, nitrofen, oxyfluorfen) in water samples were extracted with cloud-point extraction of Triton X-114. The analytes were separated and determined using reverse phase HPLC with ultraviolet detector at 300 nm. Optimized conditions for the pretreatment of water samples and the parameters of chromatographic separation applied.
  
  
  RESULTS
  There was a good linear correlation between the concentration and the peak area of the analytes in the range of 0.05-2.00 mg/L (r = 0.9991-0.9998). Except bentazone, the spiked recoveries of the biphenyl ether herbicides in the water samples ranged from 80.1% to 100.9%, with relative standard deviations ranging from 2.70% to 6.40%. The detection limit of the method ranged from 0.10 microg/L to 0.50 microg/L.
  
  
  CONCLUSIONS
  The proposed method is simple, rapid and sensitive, and can meet the requirements of determination of multiple biphenyl ether herbicides simultaneously in natural waters.
authors.affiliation: Department of Sanitary Technology, West China School of Public Health, Sichuan University, Chengdu 610041, China.
authors.forename: Cheng-Yan
authors.initials: CY
authors.lastname: He
authors.forename: Yuan-Qian
authors.initials: YQ
authors.lastname: Li
authors.forename: Shen-Jiao
authors.initials: SJ
authors.lastname: Wang
authors.forename: Hua-Xue
authors.initials: HX
authors.lastname: Ouyang
authors.forename: Bo
authors.initials: B
authors.lastname: Zheng
mesh_terms: D001549:Benzamides / Q000032:analysis; D001581:Benzothiadiazines / Q000032:analysis; D001713:Biphenyl Compounds / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D009579:Nitrobenzoates / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001549:Benzamides; D001581:Benzothiadiazines; D001713:Biphenyl Compounds; D006540:Herbicides; D009579:Nitrobenzoates; D010573:Pesticide Residues; D014874:Water Pollutants, Chemical; C088563:fomesafen; C018425:acifluorfen; C002003:bentazone