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5.0μg/L和0.5μg/L;分别在50～1 000μg/L和5.0～100μg/L范围内呈现良好的线性关系,线性相关系数分别为0.999 4和0.999 8;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。
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 50-1 000 μg/L（r2=0.999 4） and 5.0-100 μg/L（r2=0.999 8）,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.
出处
《色谱》
CAS
CSCD
北大核心
2012年第4期409-413,共5页
Chinese Journal of Chromatography
基金
国家自然科学基金项目(20977042
21175060)
关键词
加速溶剂萃取
离子色谱
三价铬
六价铬
塑料
accelerated solvent extraction（ASE）
ion chromatography（IC）
trivalent chromium
hexavalent chromium
plastics
