色谱

色谱 ›› 2012, Vol. 30 ›› Issue (04): 409-413.DOI: 10.3724/SP.J.1123.2011.12056

• 特别策划 • 上一篇    下一篇

快速溶剂萃取-离子色谱法同时测定塑料中的三价铬和六价铬

虞锐鹏1, 胡忠阳2, 叶明立2, 车金水2*   

  1. 1. 江南大学食品科学与技术国家重点实验室, 江苏 无锡 214122; 2. 赛默飞世尔科技有限公司上海实验室, 上海 201203
  • 收稿日期:2011-12-19 修回日期:2012-02-16 出版日期:2012-04-28 发布日期:2012-04-28
  • 通讯作者: 车金水,硕士,工程师,主要从事仪器分析.
  • 基金资助:

    国家自然科学基金项目(20977042, 21175060).

Simultaneous determination of trivalent chromium and hexavalent chromium in plastics by accelerated solvent extraction-ion chromatography

YU Ruipeng1, HU Zhongyang2, YE Mingli2, CHE Jinshui2*   

  1. 1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China; 2. Shanghai Lab., Thermo Fisher Scientific Inc., Shanghai 201203, China
  • Received:2011-12-19 Revised:2012-02-16 Online:2012-04-28 Published:2012-04-28

PDF

548

被引次数

55

摘要： 建立了采用快速溶剂萃取-离子色谱同时测定塑料中三价铬和六价铬的方法。三价铬和六价铬分别以吡啶-2,6-二羧酸(PDCA)和1,5-二苯卡巴肼(DPC)作为络合剂在柱前和柱后进行衍生化,分别在紫外和可见波长下采用紫外检测器进行检测,灵敏度高,基体干扰小。本方法对三价铬和六价铬的检出限分别为5.0 μg/L和0.5 μg/L;分别在50～1000 μg/L和5.0～100 μg/L范围内呈现良好的线性关系,线性相关系数分别为0.9994和0.9998;三价铬和六价铬的回收率范围为90.7%～101.1%,相对标准偏差(RSD)为1.7%～4.4%。该方法分析速度快、灵敏度高、重现性好,可用于塑料中三价铬和六价铬的同时测定。

关键词: 加速溶剂萃取, 离子色谱, 六价铬, 三价铬, 塑料

Abstract: A method based on accelerated solvent extraction-ion chromatography (ASE-IC) was developed for the simultaneous determination of trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) in plastic samples. The accelerated solvent extraction was employed as the pretreatment method for the simultaneous extraction of the Cr(III) and Cr(VI) from the samples. Cr(III) and Cr(VI) were derivatized with 2,6-pyridinedicarboxylic acid (PDCA) and 1,5-diphenyl-carbazide (DPC), and detected by an ultraviolet-visible (UV-Vis) detector at UV and visible wavelengths, respectively. The results showed that the limits of detection for Cr(III) and Cr(VI) were 5.0 μg/L and 0.5 μg/L and the good linearities of the calibration curves for them were in the ranges of 50~1000 μg/L (r2=0.9994) and 5.0~100 μg/L (r2=0.9998), respectively. The recoveries were between 90.7% and 101.1% with the relative standard deviations (RSDs) of 1.7%~4.4% for Cr(III) and Cr(VI). The method is sensitive, reproducible and adaptable to the simultaneous determination of Cr(III) and Cr(VI) in the plastic samples.

Key words: hexavalent chromium, ion chromatography (IC), plastics, trivalent chromium, accelerated solvent extraction (ASE)