ISO 4685:2024 水的质量 镭226 使用电感耦合等离子体质谱（ICP-MS）的试验方法

标准编号：ISO 4685:2024

中文名称：水的质量 镭226 使用电感耦合等离子体质谱（ICP-MS）的试验方法

英文名称：Water quality — Radium 226 — Test method using ICP-MS

发布日期：2024-01

标准范围

本文件规定了通过电感耦合等离子体质谱（ICP-MS）测定226Ra浓度的方法。获得的质量浓度可以转换为活度浓度。该方法适用于饮用水、雨水、地表水和地下水的测试样品，经过适当的取样和处理，并进行测试样品制备。检测限取决于样品体积、所用仪器、背景计数率、检测效率、计数时间和化学收率。使用目前可用的设备，本文所述方法的检测限约为10？mBq·l-1，优于WHO饮用水安全饮用标准（1？Bq·l-1）。该方法涵盖了活度浓度在0,001之间的水中226Ra的测量？Bq·l？1和100？Bq·l？1.浓度高于1？Bq·l？如果进行稀释，可以测量1。本文件中描述的方法适用于紧急情况。在该方法中，测试样品的过滤是必要的。吸附在悬浮物上的226Ra的分析不包括在该方法中。不溶性部分的分析需要矿化步骤，本文件未涵盖。在这种情况下，对获得的不同相位进行测量。用户有责任确保本测试方法对所测试水样的有效性。

This document specifies methods to determine ²²⁶Ra concentration by inductively coupled plasma mass spectrometry (ICP-MS). The mass concentrations obtained can be converted into activity concentrations.

The method is applicable to test samples of drinking water, rainwater, surface and ground water, after proper sampling and handling, and test sample preparation.

The detection limit depends on the sample volume, the instrument used, the background count rate, the detection efficiency, the counting time and the chemical yield. The detection limit of the method described in this document, using currently available equipment, is approximately 10 mBq·l^-1, which is better than the WHO criteria for safe consumption of drinking water (1 Bq·l^-1).

This method covers the measurement of ²²⁶Ra in water at activity concentrations between 0,001 Bq·l^？1 and 100 Bq·l^？1. Samples with concentrations higher than 1 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.

In this method, filtration of the test sample is necessary. The analysis of ²²⁶Ra 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.

标准预览图