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EC number: 429-330-7
CAS number: -
3,5 DCP 3.2
The influence of PDTN on the respiration
rate of activated sludge was investigated after a contact time of 30
The study procedure was based on OECD
Guideline No. 209, adopted April 4, 1984 and EEC Directive 67/548
amended November 18, 1987 (871302), Part C.11, Publication No. L133,
adopted May 30, 1988. Since PDTN was hardly soluble in water, PDTN was
added quantitatively to the test vessels at a concentration of
approximately 100 mg/l. This concentration was tested in duplicate. No
significant inhibition in respiration rate of the sludge was recorded at
approximately 100 mg PDTN per litre. The duplicate measurement confirmed
the result of the first measurement. Therefore no further testing was
needed. The respiration rates of the controls were within 15% of each
other. The EC50 of the reference substance, 3,5-dichlorophenol, was 9
mg/l. Therefore, the test was considered to be valid. In conclusion,
under the conditions of this present test PDTN was not toxic to
waste-water bacteria at a concentration of approximately 100 mg/l.
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