警告-使用本文件的人员应熟悉正常的实验室实践。本文件并非旨在解决与其使用相关的所有安全问题（如有）。用户有责任建立适当的安全和健康实践。 重要事项——根据本文件进行的测试必须由具备相应资质的人员进行。本文件规定了在培养5d或7d后，通过稀释和接种抑制硝化作用来测定水的生化需氧量。 它适用于所有生化需氧量通常在1 mg/l和6000 mg/l之间的水。它特别适用于废水，但也适用于天然水的分析。对于大于6000 mg/l氧气的生化需氧量，该方法仍然适用，但需要特别注意，考虑到准备稀释步骤的二次取样的代表性。所获得的结果是生物化学和化学反应的产物，在存在生物物质的情况下，生物化学和化学反应的表现只是偶尔的再现性。 这些结果没有单一的、定义明确的化学过程所产生的结果那样严格和明确。然而，这些结果提供了一个可以估计水质的指标。交叉引用:ISO 10523ISO 15705ISO 6060ISO 5667-3ISO 8467ISO 5814ISO 17289ISO 5813ISO 8245ISO 3696ISO 6107-2:2006ISO 7393-1:1985ISO 20079:2005ISO 7393-2:2017购买本文件时提供的所有当前修订版均包括在内。

WARNING — Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices. IMPORTANT — It is absolutely essential that tests conducted in accordance with this document be carried out by suitably qualified staff.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.Cross References:ISO 10523ISO 15705ISO 6060ISO 5667-3ISO 8467ISO 5814ISO 17289ISO 5813ISO 8245ISO 3696ISO 6107-2:2006ISO 7393-1:1985ISO 20079:2005ISO 7393-2:2017All current amendments available at time of purchase are included with the purchase of this document.