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Commission Directive 2004/73/ECShow full title
Commission Directive 2004/73/EC of 29 April 2004 adapting to technical progress for the twenty-ninth time Council Directive 67/548/EEC on the approximation of the laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (Text with EEA relevance)
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- 2004 No. 73
- ANNEX 2I
- Division ANNEX 1
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ANNEX 1 GUIDANCE ON THE AEROBIC AND THE ANAEROBIC TEST SYSTEMS U.K.
Aerobic test system U.K.
The aerobic test system described in this test method consists of an aerobic water layer (typical oxygen concentrations range from 7 to 10 mgl-1 ) and a sediment layer, aerobic at the surface and anaerobic below the surface (typical average redox potentials (Eh) in the anaerobic zone of the sediment range from -80 to -190 mV). Moistened air is passed over the surface of the water in each incubation unit to maintain sufficient oxigen in the head space.
Anaerobic test system U.K.
For the anaerobic test system, the test procedure is essentially the same as that outlined for the aerobic system with the exception that moistened nitrogen is passed above the surface of the water in each incubation unit to maintain a head space of nitrogen. The sediment and water are regarded as anaerobic once the redox potential (Eh) is lower than -100 mV.
In the anaerobic test, assessment of mineralisation includes measurement of evolved carbon dioxide and methane.
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