title: A modified QuEChERS method for the determination of some herbicides in yogurt and milk by high performance liquid chromatography.
abstract: A modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method was applied to the extraction of triazines and phenylureas from milk and yogurt. The herbicides was extracted by the mixture of ethyl acetate and n-hexane and cleaned by primary secondary amine (10mg/mL). The frozen-out centrifugation was applied to further remove fatty. The proposed method can achieve efficient extraction and cleanup. Some experimental parameters, such as extraction method, extraction solvent and adsorbent, pH of sample solution, extraction time and amount of primary secondary amine and sodium chloride were investigated and optimized. The precision and absolute recoveries of eight herbicides vary from 0.07 to 5.86% and from 78.9 to 99.9%, respectively. The detection limits for simeton, monuron, chlorotoluron, simetryne, atrazine, karmex, ametryne and propazine range from 0.15 to 0.35 ng/mL.
authors.affiliation: College of Chemistry, Jilin University, Qianjin Street 2699, Changchun 130012, PR China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Lei
authors.forename: Li
authors.initials: L
authors.lastname: Nian
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Shuting
authors.initials: S
authors.lastname: Wu
authors.forename: Ruibing
authors.initials: R
authors.lastname: Ren
authors.forename: Yeqiang
authors.initials: Y
authors.lastname: Wang
authors.forename: Hanqi
authors.initials: H
authors.lastname: Zhang
authors.forename: Aimin
authors.initials: A
authors.lastname: Yu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003611:Dairy Products / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results
chemical_list: D006540:Herbicides