title: Analysis of hexavalent chromium in Colla corii asini with on-line sample pretreatment valve-switching ion chromatography.
abstract: An ion chromatography (IC) system with on-line sample pretreatment using valve-switching technique was developed for the determination of hexavalent chromium (Cr(VI)) in Colla corii asini. Colla corii asini is a complicated sample with organics as main matrix. In this work, a polymer-based reversed-phase column was used as a pretreatment column. Via valve-switching technique, sample solution with target ions were eluted from a collection loop to analytical columns, with matrix eliminated on-line. Under the optimized separation conditions, the method showed good linearity (r=0.9998) in the range of 0.004-1.0mg/L and satisfactory repeatability (RSD<3%, n=6). The limit of detection (LOD) was 1.4μg/L (S/N=3). The average spiked recoveries of Cr(VI) were 93.4-102.0%. The result showed that the on-line sample pretreatment IC system was convenient and practical for the determination of trace Cr(VI) in Colla corii asini samples.
authors.affiliation: Department of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028, China.
authors.forename: Yuling
authors.initials: Y
authors.lastname: Yang
authors.forename: Jie
authors.initials: J
authors.lastname: He
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Huang
authors.forename: Naifei
authors.initials: N
authors.lastname: Zhong
authors.forename: Zuoyi
authors.initials: Z
authors.lastname: Zhu
authors.forename: Renyu
authors.initials: R
authors.lastname: Jiang
authors.forename: Jinghua
authors.initials: J
authors.lastname: You
authors.forename: Xiuyang
authors.initials: X
authors.lastname: Lu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhu
authors.forename: Shiwei
authors.initials: S
authors.lastname: He
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D002857:Chromium / Q000032:analysis*; D008516:Medicine, Chinese Traditional
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion
keywords: Colla corii asini; Hexavalent chromium (Cr(VI)); Ion chromatography; On-line pretreatment; Valve-switching