离子色谱-柱后衍生-紫外可见检测法测定地下水中痕量六价铬  

Determination of trace Cr(Ⅵ)in groundwater by ion chromatography(IC)with post-column derivatization and UV/Visible spectrometer

作　　者：徐硕[1] 周健楠[1] 杨懂艳[1] 丁萌萌[1] 常淼[1] 刘保献[1] 

机构地区：[1]北京市环境保护监测中心,北京100048

出　　处：《分析仪器》2016年第6期37-41,共5页Analytical Instrumentation

摘　　要：建立了离子色谱-柱后衍生-紫外可见检测法直接测定地下水中痕量六价铬的方法 ,确定了方法的性能指标,开展了干扰实验的研究。研究发现,本方法可在8分钟内完成分析,六价铬峰型尖锐,方法标准曲线线性范围0.05-5.00μg/L,相关系数≥0.9999。方法检出限较低（0.008μg/L）,精密度和准确度较高,3种地下水实际样品的加标回收率为94%-106%,RSD为0.6%-4.0%（n=8）。高浓度SO42-（500-3000mg/L）对六价铬测定无干扰,而Cl-（〉500mg/L）可在一定程度上干扰六价铬峰形。本方法耗时短、选择性强、灵敏度高、前处理简单、干扰较少,相对常规方法能够更好地满足地下水中六价铬测定的实际需要。The method was proved to be effective in Cr（Ⅵ）determination,and the analysis was accomplished in 8minutes with a favorable peak profile.The correlation coefficient was〉0.9999 for Cr（Ⅵ）in the range of 0.05-5μg/L,and the detection limit was as low as 0.008μg/L.The high accuracy and precision were proved by the satisfactory recovery rates（94%-106%）and RSDs（0.6%-4.0%）for 3different kinds of actual groundwater samples.The high concentration of sulfate had no influence in Cr（Ⅵ）detection while the high concentration of chloride could compromise the chromatography.This method can be used for Cr（Ⅵ）determination in groundwater.

关 键 词：离子色谱 柱后衍生 地下水 六价铬 

分 类 号：X832[环境科学与工程—环境工程]