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ILNAS-EN ISO 10634:2018 Edition 12/2018
Water quality - Preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their biodegradability in an aqueous medium (ISO 10634: 2018)
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This document specifies techniques for preparing poorly water-soluble organic compounds (i.e. liquid and solid compounds) with a solubility in water of less than approximately 100 mg/l and introducing them into test vessels for a subsequent biodegradability test in an aqueous medium using standard methods. The subsequent tests on biodegradability are primarily methods using the analysis of the released carbon dioxide described in ISO 9439 and the determination of the oxygen described in ISO 9408 and following the usual precautions for ISO 10707. Thus, one can notice that the methods measuring the removal of dissolved organic carbon (DOC) are not appropriate. This document does not specify the biodegradation test methods. It is restricted to describing techniques for introducing the test compounds into the test medium and to keeping them in a dispersed state[4]. These techniques are implemented while observing the experimental conditions described in the standardized methods for evaluating biodegradability. ISO 9439, based on CO2 evolution, is not suitable for testing volatile compounds. Some of the preparation methods described in this document might not be accepted by regulators for making conclusions on the ready biodegradability of tested compounds. Examples of biodegradability curves are given in Annex A.


Standard - Active


Technical Committee :
CEN/TC 230 : Water analysis


start of the vote on the project    27/07/2017   date of ratification (dor)    20/10/2018
end of the vote on the project    19/10/2017   date of anouncement (doa)    31/03/2019
start of the vote on the final project    26/07/2018   date of publication (dop)    30/06/2019
end of the vote on the final project    19/09/2018   date of withdrawal (dow)    30/06/2019

Publication Official Journal
of the Grand-Duchy of Luxembourg
Reference Mémorial A N° 13


Relations to older standards
ILNAS-EN ISO 10634:1995

Relations to international standards
ISO 10634 
ISO 10634:2018 

International Classification for Standards (ICS codes) :

13.060.70 : Examination of biological properties of water


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