Author/Authors :
Yang، نويسنده , , Yuling and He، نويسنده , , Jie and Huang، نويسنده , , Zhongping and Zhong، نويسنده , , Naifei and Zhu، نويسنده , , Zuoyi and Jiang، نويسنده , , Renyu Sun، نويسنده , , Jinghua and Lu، نويسنده , , Xiuyang and Zhu، نويسنده , , Yan and He، نويسنده , , Shiwei، نويسنده ,
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 0.004–1.0 mg/L and satisfactory repeatability (RSD < 3%, n = 6). The limit of detection (LOD) was 1.4 μg/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
Keywords :
Valve-switching , Hexavalent chromium (Cr(VI)) , Colla corii asini , Ion chromatography , On-line pretreatment
