电感耦合等离子体质谱法分析废水中痕量碲、锑和镍的研究

Determination of Trace Tellurium,Antimony and Nickel in Waste Water by Inductively Coupled Plasma-Mass Spectrometry

本文应用电感耦合等离子体质谱(ICP-MS)技术,测定了废水中碲、锑和镍的含量。实验选用^(125)Te、和^(128)Te、^(121)Sb和^(123)Sb、^(60)Ni和^(62)Ni同位素作为测试对象。试样经过封闭加热系统的预处理,然后用标准工作曲线法和标准加入法进行对比研究,得到了一致的结果。试样中Te、Sb和Ni的浓度高于10μg/L时,测试的相对标准偏差为1～3％。对250和2000μg/L标样的实测值和标准值的相对偏差为0.8～2％。^(125)Te、^(128)Te、^(121)Sb、^(123)Sb、^(60)N和^(62)Ni的检测限分别为0.05、0.02、0.03、0.03、0.06和0.1μg/L。^(62)Ni有较高的检测限,是因为它的同位素丰度偏低(3.71％)。

The determination of trace Te, Sb and Ni in waste water has been investigated by inductively coupled plasma-mass spectrometry. Samples have been pretreated in closed system with oxidant(NH_4)_2S_2O_8. Based on the comparative determinations of ^(125)Te and ^(128)Te, ^(121)Sb and ^(123)Sb, ^(60)Ni and ^(62)Ni isotopes by concentration calibration and standard addition methods, the agreement results for a series of typical samples have been obtained. The relative standard deviation is in 1～3% for Te, Sb and Ni at concentration higher than 10μg/L, while in 0. 8～2% for 250 and 2000μg/L standards. The detection limits for ^(125)Te, ^(128)Te, ^(121)Sb, ^(123)Sb, ^(60)Ni and ^(62)Ni correspond to 0. 05, 0. 02, 0. 03, 0. 03, 0. 06 and 0. 01μg/L, respectively. The detection limit of ^(62)Ni is higher than that of the others due to its low isotopic abundance(3. 71%).