【摘要】：應(yīng)用電感耦合等離子體質(zhì)譜法(ICP-MS)分析環(huán)境地質(zhì)樣品中的Cd時(shí),Zr、Mo元素的氧化物和氫氧化物會(huì)對(duì)Cd造成嚴(yán)重干擾,導(dǎo)致結(jié)果有明顯的偏差。針對(duì)此問(wèn)題,本文建立了膜去溶-ICP-MS直接測(cè)定環(huán)境地質(zhì)樣品中微量Cd的分析方法,該方法可有效地消除Zr、Mo氧化物和氫氧化物對(duì)Cd的干擾,保證結(jié)果準(zhǔn)確、可靠。膜去溶-ICP-MS相比于常規(guī)ICP-MS測(cè)定Cd的方法,可將Zr、Mo氧化物和氫氧化物對(duì)Cd的干擾降低到0.001%,檢測(cè)靈敏度提高3.5倍左右。在給定條件下,Cd的檢出限為0.28 ng/L,測(cè)定下限為2.2 ng/L,精密度(RSD,n=12)為2.2%。利用該方法分析20種巖石、土壤和沉積物國(guó)家標(biāo)準(zhǔn)物質(zhì)的測(cè)定值與標(biāo)準(zhǔn)值相符,表明膜去溶-ICP-MS法直接測(cè)定環(huán)境地質(zhì)樣品中痕量或超痕量Cd時(shí)具有一定的應(yīng)用潛力。同時(shí),用該方法對(duì)2016年中核集團(tuán)組織的實(shí)驗(yàn)室間兩個(gè)比對(duì)樣品中的Cd進(jìn)行測(cè)定,穩(wěn)健Z比分?jǐn)?shù)分別為0.500和-0.964,Z的絕對(duì)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.
【作者單位】： 國(guó)家核安保技術(shù)中心;
【基金】：中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(DD20160095)
【分類號(hào)】：O657.63;X830

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