膜去溶-电感耦合等离子体质谱法测定环境地质样品中的镉

发布时间：2019-01-01 09:47

【摘要】：应用电感耦合等离子体质谱法(ICP-MS)分析环境地质样品中的Cd时,Zr、Mo元素的氧化物和氢氧化物会对Cd造成严重干扰,导致结果有明显的偏差。针对此问题,本文建立了膜去溶-ICP-MS直接测定环境地质样品中微量Cd的分析方法,该方法可有效地消除Zr、Mo氧化物和氢氧化物对Cd的干扰,保证结果准确、可靠。膜去溶-ICP-MS相比于常规ICP-MS测定Cd的方法,可将Zr、Mo氧化物和氢氧化物对Cd的干扰降低到0.001%,检测灵敏度提高3.5倍左右。在给定条件下,Cd的检出限为0.28 ng/L,测定下限为2.2 ng/L,精密度(RSD,n=12)为2.2%。利用该方法分析20种岩石、土壤和沉积物国家标准物质的测定值与标准值相符,表明膜去溶-ICP-MS法直接测定环境地质样品中痕量或超痕量Cd时具有一定的应用潜力。同时,用该方法对2016年中核集团组织的实验室间两个比对样品中的Cd进行测定,稳健Z比分数分别为0.500和-0.964,Z的绝对值都小于2。
[Abstract]:When Cd in environmental geological samples is analyzed by inductively coupled plasma-mass spectrometry (ICP-MS), the oxides and hydroxides of Zr,Mo elements will seriously interfere with Cd, resulting in obvious deviation of the results. In order to solve this problem, a method for the direct determination of trace Cd in environmental geological samples by membrane dissolving-ICP-MS has been established. The method can effectively eliminate the interference of Zr,Mo oxides and hydroxides on Cd, and ensure the accuracy and reliability of the results. Compared with the conventional ICP-MS method, the interference of Zr,Mo oxide and hydroxide to Cd can be reduced to 0.001 by ICP-MS, and the detection sensitivity is increased about 3.5fold. Under given conditions, the detection limit of Cd is 0. 28 ng/L, the detection limit is 2. 2 ng/L, precision (RSD,n=12) and the limit of detection is 2. 2 ng/L,. This method is used to analyze 20 kinds of rocks, and the determination values of the national standard materials in soil and sediment are in agreement with the standard values, which indicates that the direct determination of trace or ultra-trace Cd in environmental geological samples by membrane dissolvation-ICP-MS method has certain application potential. At the same time, the Cd in the samples of the two laboratory comparisons organized by the Central Nuclear Group in 2016 were determined by this method. The absolute values of robust Z ratio of 0.500 and -0.964g / Z were less than 2.
【作者单位】：国家核安保技术中心;
【基金】：中国地质调查局地质调查项目(DD20160095)
【分类号】：O657.63;X830

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