BS EN ISO 13162:2021 – TC

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Tracked Changes. Water quality. Carbon 14. Test method using liquid scintillation counting

Published By	Publication Date	Number of Pages
BSI	2021	80

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Categories: 13.060.60 - Examination of physical properties of water, BSI

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This document specifies a method for the measurement of ¹⁴C activity concentration in all types of water samples by liquid scintillation counting (LSC) either directly on the test sample or following a chemical separation.

The method is applicable to test samples of supply/drinking water, rainwater, surface and ground water, marine water, as well as cooling water, industrial water, domestic, and industrial wastewater.

The detection limit depends on the sample volume, the instrument used, the sample counting time, the background count rate, the detection efficiency and the chemical recovery. The method described in this document, using currently available liquid scintillation counters and suitable technical conditions, has a detection limit as low as 1 Bq?l^?1, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq·l^-1). ¹⁴C activity concentrations can be measured up to 10⁶ Bq?l^-1 without any sample dilution.

It is the user’s responsibility to ensure the validity of this test method for the water samples tested.

PDF Catalog

PDF Pages	PDF Title
50	National foreword
52	European foreword
54	Foreword
55	Introduction
57	1 Scope 2 Normative references
58	3 Terms, definitions, symbols and abbreviations
59	4 Principle
60	5 Sampling and storage 5.1 Sampling 5.2 Sample storage 6 Reagents and equipment 6.1 Reagents 6.1.1 Reference water for the blank 6.1.2 Calibration source solution
61	6.1.3 Scintillation solution 6.1.4 Quenching agent 6.2 Equipment 7 Procedure 7.1 Sample preparation 7.2 Preparation of the counting vial
62	7.3 Counting procedure 7.4 Calibration and verification
63	7.5 Measurement conditions 8 Expression of results 8.1 General 8.2 Calculation of activity concentration without sample preparation 8.3 Calculation of activity concentration with sample preparation
64	8.4 Decision threshold 8.5 Detection limit
65	8.6 Limits of the coverage intervals 8.6.1 Limits of the probabilistically symmetric coverage interval 8.6.2 Limits of the shortest coverage interval
66	8.7 Calculations using the activity per mass 9 Test report
68	Annex A (informative) Extraction of total carbon by precipitation of calcium carbonate
71	Annex B (informative) Extraction of total carbon: absorption counting
74	Annex C (informative) Internal standard method
76	Annex D (informative) Numerical applications
78	Bibliography