低温等离子体探针-原子荧光光谱法检测镉元素的方法研究  

Determination of cadmium by low temperature plasma probe-atomic fluorescence spectrometry

作　　者：李铭[1] 李健 陈帅 杨萌[1] 黄秀[1] 冯璐[1] 范博文[1] 邢志[1] 

机构地区：[1]清华大学化学系,北京100084 [2]江苏衡昇仪器有限公司,泰州225300

出　　处：《分析仪器》2017年第2期53-57,共5页Analytical Instrumentation

基　　金：国家重大科学仪器设备开发专项(2011YQ06010002);清华大学实验室创新基金(04405)

摘　　要：建立了低温等离子体探针-原子荧光光谱法直接检测PVDF膜上Cd含量的方法。研究了固体中Co对Cd的荧光增敏作用,并讨论了其增敏机理。在Co/Cd(质量比)为1~2时,Cd的分析灵敏度提高了约8倍。本实验对放电功率、放电气流量、载气流量、屏蔽气流量、原子化器高度和采样距离等参数进行了优化,在最佳实验条件下,本方法在0~100ng范围内线性相关性较好(R^2≥0.991),方法检出限为0.127ng。本方法对实际样品的测量结果与ICP-MS的测量结果相一致,表明本方法的准确度较高。PVDF膜上滴加微量体积(≤2μL)溶液样品风干后直接测定的方法,特别适合于微体积样品的分析及现场分析。A new method for determination of cadmium on the surface of PVDF membrane by low temperature plasma probe-atomic fluorescence spectrometry （LTP-AFS） was developed. In this work, the Co was found to have fluorescence sensitization effect on Cd, the sensitization mechanism was also discussed. When the Co/Cd （mass ratio） was within 1 to 2, the sensitivity of Cd was increased about 8 times. The parameters such as discharge power, discharge gas flow rate, carrier gas flow rate, shield gas flow rate, observation height and sampling distance were optimized. Under the optimum experimental conditions, this method had a good linear correlation （R^2≥ 0. 991） within 0-100 ng, the detection limit of Cd was 0. 127 ng. The accuracy of this method was verified by comparing the measurement results of LTP-AFS with ICP-MS. The method of direct determination dried PVDF membrane after added trace volume （4 2 μL） solution is particularly suitable for the analysis of small volume samples and field analysis.

关 键 词：低温等离子体 原子荧光光谱 镉 固体直接进样 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O657.31[理学—分析化学]