常压硫酸体系ICP-MS法测定土壤及沉积物中16种稀土元素及Th和U
Determination of 16 rare earth elements and Th and U in soil and sediment by ICP-MS under atmospheric pressure sulfuric acid system
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摘要: 本文建立了常压硫酸消解体系ICP-MS检测方法，并应用于27种GSS土壤和25种GSD水系沉积物标准物质中稀土元素的测定.该方法前处理时间约12 h，在优化的测试条件下，16种稀土元素及钍（Th）和铀（U）总共936个有效数据平均回收率为92%，其中回收率90%—110%占91.1%，相对平均标准偏差小于5.0%，样品重复35次测试RSD≤3%.此方法成本低，通量大，操作简单，反应体系处于常压较低温，安全，适用于大批量多类型的土壤与水系沉积物样品分析测试.Abstract: An ICP-MS detection method for atmospheric pressure sulfuric acid digestion system was established and applied to the determination of rare earth elements in 52 solid standard materials (including 27 kinds of GSS soil and 25 kinds of GSD water sediment). The pretreatment time of this method is about 12 hours. Under the optimized test conditions, the average recovery rate of 936 effective data of 16 rare earth elements and thorium (Th) and uranium (U) is 92%, and the recovery rate is 90%-110% which is accounted 91.1% for all data. The relative average standard deviation was less than 5.0%, and the test was repeated 35 times with RSD ≤ 3%. The method has the advantages of low cost, large throughput and simple operation, and the reaction system is at a normal pressure and low temperature. It is safe and suitable for the analysis and testing of large-volume and multi-type soil and water sediment samples.
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