标准编号：ISO 22125-2:2019
中文名称：水质 锝-99 第2部分：电感耦合等离子体质谱法（ICP-MS）的试验方法
英文名称：Water quality — Technetium-99 — Part 2: Test method using inductively coupled plasma mass spectrometry (ICP-MS)
发布日期：2019-11
标准范围
This document specifies a method for the measurement of 99Tc in all types of water by inductively
coupled plasma mass spectrometry (ICP-MS).
The method is applicable to test samples of supply/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. A filtration of the test sample is necessary.
The detection limit depends on the sample volume and the instrument used. The method described in
this document, using currently available ICP-MS, has a detection limit of approximately 0,2 ng·kg−1 to
0,5 ng·kg −1 (0,1 Bq·kg−1 to 0,3 Bq·kg −1), which is much lower than the WHO criteria for safe consumption
of drinking water (100 Bq·l −1) [3] . The method presented in this document is not intended for the
determination of ultra-trace amount of 99Tc.
The mass concentration values in this document are expressed by sample mass unit instead of sample
volume unit as it is usually the case in similar standards. The reason is that 99Tc is measured in various
matrix types such as fresh water or sea water, which have significant differences in density. The mass
concentration values can be easily converted to sample volume unit by measuring the sample volume.
However, it increases the uncertainty on the mass concentration result.
The method described in this document is applicable in the event of an emergency situation, but not if
99mTc is present at quantities that could cause interference.
The analysis of Tc adsorbed to suspended matter is not covered by this method.
It is the user’s responsibility to ensure the validity of this test method for the water samples tested.
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