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Homepage>BS Standards>13 ENVIRONMENT. HEALTH PROTECTION. SAFETY>13.060 Water quality>13.060.50 Examination of water for chemical substances>BS EN ISO 5815-1:2019 Water quality. Determination of biochemical oxygen demand after n days (BODn) Dilution and seeding method with allylthiourea addition
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immediate downloadReleased: 2019-11-27
BS EN ISO 5815-1:2019 Water quality. Determination of biochemical oxygen demand after n days (BODn) Dilution and seeding method with allylthiourea addition

BS EN ISO 5815-1:2019

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

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Standard number:BS EN ISO 5815-1:2019
Pages:32
Released:2019-11-27
ISBN:978 0 539 12152 0
Status:Corrigendum
DESCRIPTION

BS EN ISO 5815-1:2019


This standard BS EN ISO 5815-1:2019 Water quality. Determination of biochemical oxygen demand after n days (BODn) is classified in these ICS categories:
  • 13.060.70 Examination of biological properties of water
  • 13.060.50 Examination of water for chemical substances

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.