水质-锶90-ICP-MS测试方法

[中文适用范围]： 本文件规定了用电感耦合等离子体质谱法（ICP-MS）测定锶-90的方法。获得的质荷比浓度可以转换为活度浓度。 本文件所述方法适用于在适当采样和处理以及测试样品制备后，用于供应水、饮用水、雨水、地表水和地下水、冷却水、工业水、生活用水及工业废水的测试样品。 本文件的方法检测限取决于样品体积、使用的仪器、背景计数率、检测效率和化学产率。在本文件中，使用目前现有的装置和化学预富集，方法的检测限约为5 Bq L-1，低于饮用水安全消费准则（10 Bq L-1）。 本文件所述的方法适用于应急情况。测试样品的过滤对于本文件所述的方法是必要的。 分析悬浮物质上吸附的锶-90不在本方法范围内。对不可溶部分的分析需要进行矿化步骤，该步骤未在本文件中涵盖。在这种情况下，测量是在获得的不同相上进行的。 [外文原描述]： This document specifies methods to determine strontium-90 ( 90 Sr) by inductively coupled plasma mass spectrometry (ICP-MS). The mass concentrations obtained can be converted into activity concentrations. The method described in this document is applicable to test samples of supply water, drinking water, rainwater, surface and ground water, as well as cooling water, industrial water, domestic and industrial wastewater after proper sampling and handling and test sample preparation. The limit of detection depends on the sample volume, the instrument used, the background count rate, the detection efficiency and the chemical yield. In this document, the limit of detection of the method using currently available apparatus and chemical pre-concentration, is approximately 5 Bq·l −1 , which is lower than the WHO criteria for safe consumption of drinking water (10 Bq·l −1 ) [ 4 ] . The method described in this document covers the measurement of 90 Sr in water at activity concentrations up to 1 000 Bq·l −1 . Samples with higher activity concentrations than 1 000 Bq·l −1 can be measured if a dilution is performed. The method described in this document is applicable in the event of an emergency situation. Filtration of the test sample is necessary for the method described in this document. The analysis of 90 Sr adsorbed to suspended matter is not covered by this method. The analysis of the insoluble fraction requires a mineralization step that is not covered by this document. In this case, the measurement is made on the different phases obtained. It is the user’s responsibility to ensure the validity of this test method for the water samples tested.