This International Standard describes four techniques
for preparing poorly water-soluble organic compounds
and introducing them into test vessels for a subsequent
test on biodegradability in an aqueous medium
using Standard methods. The test compounds
concerned are not sufficiently soluble in water to
perform the biodegradability tests in the normal manner,
as described in the respective test methods indicated
in clause 2.
The preparation techniques are as follows:
- direct addition (clause 3): this technique is restricted
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 International
Standard does not describe the test methods;
it is restricted to describing the techniques for introducing
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. lt should be noted that
volatile chemicals may not be tested by the carbon
dioxide method specified in ISO 9439.
Diese ÖNORM beschreibt vier Techniken zum Verteilen von organischen Produkten, welche für Abbaubarkeitsprüfungen in wässrigem Medium bestimmt und welche nicht genügend löslich sind, um die Prüfungen in der üblichen Weise durchzuführen: - direkter Zusatz: diese Technik ist beschränkt auf nicht-flüchtige Prüfsubstanzen; - Ultraschall-Dispersion: diese Methode kann bei flüssigen Substanzen und solchen mit niedrigem Schmelzpunkt, alle nicht-flüchtig, angewendet werden; - Adsorption auf einem inerten Medium; - Dispersion mit einem emulgierenden Agens.