DS/EN 29408:1993 Water quality. Evaluation in an aqueous medium of the "ultimate" aerobic biodegradability of organic compounds. Method of determining the oxygen demand in a closed respirometer
This International Standard specifies a method, by determination of the oxygen demand in a closed respirometer, for the evaluation in an aqueous me-dium of the "ultimate" biodegradability of organic compounds at a given concentration by aerobic micro-organisms.
The conditions described in this International Stan-dard do not always correspond to the optimal con-ditions for allowing the maximum degree of biodegradation to occur.
The method applies to organic compounds which
a) are soluble in the test conditions,
b) are insoluble in the test conditions, in which case special measures may be necessary to achieve good dispersion of the compound;
c) do not reach and react with the C02 absorbant;
d) are volatile, provided that a suitable res-pirometer is used;
e) are not inhibitory to the test micro-organisms at the concentration chosen for the test. The pres-ence of inhibitory effects can be determined as specified in 8.3, or by using any other method for determining the inhibitory effect of a compound on bacteria (see, for example, ISO 8192).
DS/EN 29408:1993 history
1993DS/EN 29408:1993 Water quality. Evaluation in an aqueous medium of the "ultimate" aerobic biodegradability of organic compounds. Method of determining the oxygen demand in a closed respirometer