EN 1899-2:1998
水质.N日后生化需氧量(BODn)的测定.第2部分:ISO 5815-1989标准改良的未稀释样品用方法

Water Quality - Determination of Biochemical Oxygen Demand After N Days (BODn) - Part 2: Method for Undiluted Samples ISO 5815:1989, Modified

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标准号

EN 1899-2:1998

发布

1998年

发布单位

欧洲标准化委员会

当前最新

EN 1899-2:1998

 

 

引用标准

EN 25813 EN 25814 EN ISO 3696 ISO 6107-2:1997

适用范围

This European standard specifies detennination of the biochemical oxygen demand of waters of undiiuted samples. This standard is applicable to aii waters having biochemical oxygen demands greater than or equal to the limit of determination 0,5 mgíl of oxygen and not exceedmg 6 mg4 of oxygen. In this standard, the lunit of determination, DL. where SB is the within series standard deviaîion, k,g5m is the student t-value, with f is the degrees of freedom for the determination of SB and n is the number of analysis for detemination of the blank in an analytical series. SB is calculated from determinations of real samples with a BOD contentraton near the estimated DL.The resuits obtained are the product of a combination of biochemical and chemical reactions. They do not have the rigorous and unambiguous character of those resulímg from, for example, a singie, well-defined, chemid process. Nevertheless, they provide an indication from which the quality of waters can be estimated. The test can be influenced by the presence of various substances. Those which are toxic to microorganisms, for example bactericides, toxic metals or free chlorine, will inhibit biochemical oxidation. The presence of algae or nitrifymg microorganisms can produce high results. In these situations a modification of the method (see annex B or as described in EN 18941). It is absolutely esentiaì that tests conducted according to this standard are carried out by suitably quaiified staff. Annex A describes alternative incubation periods. Annex B describes procedures for modification of the method by addition of seeding makriaì, saìts, inhibition of nihification by dylthiourea (ATU) addition, neutsalization, homogenization and/or fjiWon. These modifications may be found necessary for specific evaluations of the water qual@ of receiving waters.

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