ISO 22125-2-2019 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 Water quality — Technetium-99 — Part 2: Test method using inductively coupled plasma mass spectrometry (ICP-MS) 

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.st edition 2019-11 Water quality — Technetium-99 — Part 2: Test method using inductively coupled plasma mass spectrometry (ICP-MS) Qualité de l'eau — Technétium-99 — Partie 2: Méthode d’essai par spectrométrie de masse couplée à un plasma induit (ICP-MS) Reference number ISO 22125-2:2019(E) ？ ISO 2019 ISO 22125-2:2019(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2