BS EN ISO 10634:1996 Water quality. Guidance for the preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their biodegradability in an aqueous medium
This International Standard describes four techniques for preparing poorly water-soluble organic compounds and introducing them into test vessels for a sub-sequent test on biodegradability in an aqueous me-dium using standard methods. The test compounds concerned are not sufficiently soluble in water to perform the biodegradability tests in the normal man-ner, as described in the respective test methods indi-cated in clause 2.
The preparation techniques are as follows:
— direct addition (clause 3): this technique is re-stricted to non-volatile test compounds if inert supports or solvents are used;
— ultrasonic dispersion (clause 4): this technique may be applied to non-volatile liquid and solid compounds;
— adsorption on an inert support (clause 5);
— dispersions or emulsions with an emulsifying agent (clause 6).
The subsequent tests on biodegradability are primarily methods using the analysis of the released carbon dioxide (see ISO 9439) and the determination of the oxygen consumption (see ISO 9408). This Inter-national Standard does not describe the test methods; it is restricted to describing the techniques for intro-ducing the test substances into the test medium and to keep them in a dispersed state. These techniques are implemented while observing the experimental conditions described in the standardized methods for evaluating biodegradability. It should be noted that
volatile chemicals may not be tested by the carbon dioxide method specified in ISO 9439.
BS EN ISO 10634:1996 history
2018BS EN ISO 10634:2018 Water quality. Preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their biodegradability in an aqueous medium
1996BS EN ISO 10634:1996 Water quality. Guidance for the preparation and treatment of poorly water-soluble organic compounds for the subsequent evaluation of their biodegradability in an aqueous medium