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ISO - DIS 4717

Water quality — Protactinium-231 — Test method using ICP-MS

pending, Most Current
Organization: ISO
Publication Date: 20 March 2023
Status: pending
Page Count: 24
ICS Code (Examination of physical properties of water): 13.060.60
ICS Code (Radiation measurements): 17.240
scope:

This document specifies methods used to determine 231Pa by inductively coupled plasma mass spectrometry (ICP-MS). The mass concentrations obtained can be converted into an activity concentration.

The method is applicable to test samples of drinking water, rainwater, surface and ground water, marine water, as well as cooling water, industrial water, domestic, and industrial wastewater 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 apparatus, is approximately 0,1 Bq·l-1 (or Bq·kg-1), which is the same as the WHO criteria for safe consumption of drinking water (0,1 Bq·l-1)[4].

This method covers the measurement of 231Pa in water at activity concentrations between 0,1 Bq·l−1 and 100 Bq·l−1. Samples with higher concentrations than 100 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. The analysis of 231Pa adsorbed to suspended matter is not covered by this method. If suspended material has to be removed or analysed, filtration through a 0,45 μm filter is recommended. 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.

Document History

DIS 4717
March 20, 2023
Water quality — Protactinium-231 — Test method using ICP-MS
This document specifies methods used to determine 231Pa by inductively coupled plasma mass spectrometry (ICP-MS). The mass concentrations obtained can be converted into an activity concentration....

References

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