加速溶剂萃取-离子色谱法同时测定塑料中的三价铬和六价铬

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

作者信息

Yu Ruipeng, Hu Zhongyang, Ye Mingli, Che Jinshui

机构信息

State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China.

出版信息

Se Pu. 2012 Apr;30(4):409-13. doi: 10.3724/sp.j.1123.2011.12056.

DOI:10.3724/sp.j.1123.2011.12056

PMID:22799201

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 microg/L and 0.5 microg/L and the good linearities of the calibration curves for them were in the ranges of 50 - 1 000 microg/L (r2 = 0.9994) and 5.0 - 100 microg/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.

摘要

建立了一种基于加速溶剂萃取-离子色谱法（ASE-IC）同时测定塑料样品中三价铬（Cr(III)）和六价铬（Cr(VI)）的方法。采用加速溶剂萃取作为预处理方法，同时从样品中萃取Cr(III)和Cr(VI)。Cr(III)和Cr(VI)分别用2,6-吡啶二甲酸（PDCA）和1,5-二苯基卡巴肼（DPC）衍生化，然后分别在紫外和可见光波长下用紫外可见（UV-Vis）检测器进行检测。结果表明，Cr(III)和Cr(VI)的检出限分别为5.0 μg/L和0.5 μg/L，其校准曲线的线性良好，范围分别为50 - 1000 μg/L（r2 = 0.9994）和5.0 - 100 μg/L（r2 = 0.9998）。Cr(III)和Cr(VI)的回收率在90.7%至101.1%之间，相对标准偏差（RSD）为1.7% - 4.4%。该方法灵敏、可重复，适用于塑料样品中Cr(III)和Cr(VI)的同时测定。