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BS EN ISO 13162:2021

BS EN ISO 13162:2021

$142.49

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

Published By Publication Date Number of Pages
BSI 2021 32
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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
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
10 3 Terms, definitions, symbols and abbreviations
11 4 Principle
12 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
13 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
14 7.3 Counting procedure
7.4 Calibration and verification
15 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
16 8.4 Decision threshold
8.5 Detection limit
17 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
18 8.7 Calculations using the activity per mass
9 Test report
20 Annex A (informative) Extraction of total carbon by precipitation of calcium carbonate
23 Annex B (informative) Extraction of total carbon: absorption counting
26 Annex C (informative) Internal standard method
28 Annex D (informative) Numerical applications
30 Bibliography

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BS EN ISO 13162:2021
$142.49