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BS EN ISO 5815-1:2019

BS EN ISO 5815-1:2019

$142.49

Water quality. Determination of biochemical oxygen demand after n days (BODn) – Dilution and seeding method with allylthiourea addition

Published By Publication Date Number of Pages
BSI 2019 32
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This document specifies the determination of the biochemical oxygen demand of waters by dilution and seeding with suppression of nitrification after 5 d or 7 d incubation time.

It is applicable to all waters having biochemical oxygen demands usually between 1 mg/l and 6 000 mg/l. It applies particularly to waste waters but also suits for the analysis of natural waters. For biochemical oxygen demands greater than 6 000 mg/l of oxygen, the method is still applicable, but special care is needed taking into consideration the representativeness of subsampling for preparation of the dilution steps. The results obtained are the product of a combination of biochemical and chemical reactions in presence of living matter which behaves only with occasional reproducibility. The results do not have the rigorous and unambiguous character of those resulting from, for example, a single, well-defined, chemical process. Nevertheless, the results provide an indication from which the quality of waters can be estimated.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
11 4 Principle
5 Reagents
14 6 Apparatus
7 Sampling and preservation
15 8 Interferences
8.1 General
8.2 Presence of free and/or combined chlorine
8.3 Presence of algae
16 8.4 Presence of peroxides and peroxide compounds
9 Procedure
9.1 General
9.2 Pretreatment
9.2.1 Neutralization of the sample
17 9.2.2 Homogenization
9.3 Preparation of test solutions
9.4 Calculation of dilutions
9.4.1 Empirical determination of the dilutions
18 9.4.2 Determination of dilutions via the factors R of the TOC, the permanganate index or the COD
19 9.4.3 Calculation of dilution stages via the COD
9.5 Blank value determination
9.6 Determination of dissolved oxygen
9.6.1 Measurement of dissolved oxygen using iodometric method (in accordance with ISO 5813)
20 9.6.2 Measurement of dissolved oxygen using probes (in accordance with ISO 5814 or ISO 17289)
9.7 Control analysis
21 10 Calculation and indication of the results
10.1 Examination of test solutions for valid oxygen consumption during test
10.2 Calculation of biochemical oxygen demand after n days (BODn)
22 10.3 Validity criteria
11 Test report
23 Annex A (normative) Influence of incubation periods and temperatures
24 Annex B (informative) Multitesting
27 Annex C (informative) Direct seeding of the analysis batches
28 Annex D (informative) Performance data
30 Bibliography

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BS EN ISO 5815-1:2019
$142.49