Suppression of Matrix Effects in ICP‐MS by High Power Operation of ICP: Application to Precise Determination of Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U at ng g‐1 Levels in Milligram Silicate Samples
Suppression of Matrix Effects in ICP‐MS by High Power Operation of ICP: Application to Precise Determination of Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U at ng g‐1 Levels in Milligram Silicate Samples
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DOI：
10.1111/j.1751-908x.1997.tb00678.x
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发表时间：
1997-12
影响因子：
3.8
通讯作者：
A. Makishima;E. Nakamura
中科院分区：
文献类型：
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作者：
A. Makishima;E. Nakamura
我们发现，在ICP的高功率操作（1.7 kW），岩石基质在ICP-MS（基质效应）引起的抑制信号的88 Sr，140 Ce和238 U在岩石溶液中减少。为了使信号抑制的矩阵可以忽略不计，最小稀释因子（DF）的岩石溶液的Sr，Ce和U分别为600，400和113在1.1，1.4和1.7千瓦。在此基础上，建立了流动注射-电感耦合等离子体质谱（FI-ICP-MS）快速、准确测定Rb、Sr、Y、Cs、Ba、REE、Pb、Th、U的方法。FI-ICP-MS所需的样品溶液量为0.2 ml，因此1.8 mg样品足以用于分析，检测限为几ng g-1。用该方法测定了美国地质调查局岩石标准物质JP-1、JB-1、-2、-3、JA-1、-2和-3中微量元素的含量。BCR-1、AGV-1、JB-1、-2、-3、JA-1、-2和-3的重复分析（n=5）的重现性（RSD %）<6%，通常为2.5%。本研究中BCR-1的平均浓度与参考值之间的差异<2%。因此，该方法可以为硅酸盐岩石中微量元素的测定提供可靠的数据。
We found that the suppression of signals for 88Sr, 140Ce and 238U in rock solution caused by rock matrix in ICP-MS (matrix effects) was reduced at high power operation (1.7 kW) of the ICP. To make the signal suppression by the matrix negligible, minimum dilution factors (DF) of the rock solution for Sr, Ce and U were 600, 400 and 113 at 1.1, 1.4 and 1.7 kW, respectively. Based on these findings, a rapid and precise determination method for Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U using FI (flow injection)-ICP-MS was developed. The amount of the sample solution required for FI-ICP-MS was 0.2 ml, so that 1.8 mg sample was sufficient for analysis with a detection limit of several ng g-1. Using this method, we determined the trace element concentrations in the USGS rock reference materials, DTS-1, PCC-1, BCR-1 and AGV-1, and the GSJ rock reference materials, JP-1, JB-1, -2, -3, JA-1, -2 and -3. The reproducibilities (RSD %) in replicate analyses (n=5) of BCR-1, AGV-1, JB-1, -2, -3, JA-1, -2, and -3 were < 6 %, and typically 2.5%. The difference between the average concentrations of this study for BCR-1 and those of the reference values were < 2%. Therefore, it was concluded that the method can give reliable data for trace elements in silicate rocks.