El Himri M, Pastor A, de la Guardia M
Department of Analytical Chemistry, University of Valencia, Spain.
Fresenius J Anal Chem. 2000 May;367(2):151-6. doi: 10.1007/s002160051616.
A fast and accurate procedure has been developed for the determination of uranium at microg L(-1) level in tap and mineral water. The method is based on the direct introduction of samples, without any chemical pre-treatment, into an inductively coupled plasma mass spectrometer (ICP-MS). Uranium was determined at the mass number 238 using Rh as internal standard. The method provides a limit of detection of 2 ng L(-1) and a good repeatability with relative standard deviation values (RSD) about 3% for five independent analyses of samples containing 73 microg L(-1) of uranium. Recovery percentage values found for the determination of uranium in spiked natural samples varied between 91% and 106%. Results obtained are comparable with those found by radiochemical methods for natural samples and of the same order for the certified content of a reference material, thus indicating the accuracy of the ICP-MS procedure without the need of using isotope dilution. A series of mineral and tap waters from different parts of Spain and Morocco were analysed.
已开发出一种快速准确的方法，用于测定自来水和矿泉水中微克每升（μg L⁻¹）级别的铀。该方法基于在不进行任何化学预处理的情况下，将样品直接引入电感耦合等离子体质谱仪（ICP-MS）中。以铑（Rh）作为内标，在质量数238处测定铀。该方法的检测限为2 ng L⁻¹，对于含有73 μg L⁻¹铀的样品进行五次独立分析时，具有良好的重复性，相对标准偏差值（RSD）约为3%。在加标天然样品中测定铀时，回收率在91%至106%之间。所得结果与天然样品的放射化学方法结果相当，对于参考物质的认证含量也处于同一水平，从而表明无需使用同位素稀释的ICP-MS方法的准确性。对来自西班牙和摩洛哥不同地区的一系列矿泉水和自来水进行了分析。
