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本文叙述了用无火焰原子吸收法測定硅酸盐岩石中的微量鍶的一种方法。經試驗选择的測試参数如下: 試驗研究了鉀、鈉、鈣、鎂、硅、鋁、磷、鉄、錳、鈦、銅、鋅、鎳和鉛等元素对鍶信号的干扰。这些干扰能由向标准和样品中都加入三氧化二鑭和向标准中加入三氯化鋁而消除。回收率測試結果相对偏差为—5.6%～+12.5%。对鍶含量0.01%以下的样品,标准曲綫法获得的結果与标准加入法所得結果一致。本方法絕对灵敏度为0.031毫微克/1%吸收;鍶含量在7×10~(-3)%数量級时,标准偏差σ为±0.3×10~(-3)%,相对标准偏差S/为4.56%(11次測定結果)。
This article describes a method for the determination of trace strontium in silicate rocks by flameless atomic absorption spectrometry. The test parameters selected by the experiment are as follows: The interference of strontium signals on elements such as potassium, sodium, calcium, magnesium, silicon, aluminum, phosphorus, gallium, manganese, titanium, copper, zinc, nickel and lead was studied. These disturbances can be eliminated by adding lanthanum oxide to both the standard and the sample and adding aluminum trichloride to the standard. The relative deviation of the recovery test results was -5.6% ~ + 12.5%. Strontium content of 0.01% or less of the sample, the results obtained by the standard curve method with the standard addition of the results obtained. The absolute sensitivity of this method is 0.031 ng / 1% of absorption. When the content of strontium is in the order of 7 × 10 -3%, the standard deviation σ is ± 0.3 × 10 -3%, the relative standard deviation S / 4.56% (11 measurements).