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EC number: 201-283-5 | CAS number: 80-48-8
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Endpoint summary
Administrative data
Description of key information
The mean biodegradation of 10% of PTSM was reached at day 6 (ThODNH4). At the end of the 10-day window at day 16, the mean degradation of PTSM was 58% (ThODNH4) and therefore the 10 day window criterion was not passed. The mean biodegradation at test end after 28 days was 73% (ThODNH4).
Therefore, PTSM is considered to be readily biodegradable, but failing 10-day window.
Additional information
Summary
Title: PTSM: Ready Biodegradability in a Manometric Respirometry Test
Material and Methods:
Test Species: Aerobic activated sludge (microorganisms from a domestic wastewater treatment plant) was supplied by the sewage treatment plant of Rossdorf, Germany.
Test Design: The test item PTSM was investigated for its ready biodegradability in a Manometric respirometry test over a period of 28 days. The biodegradation was followed by the oxygen uptake of the microorganisms during exposure. As a reference item sodium benzoate was tested simultaneously under the same conditions as the test item, and functioned as a procedure control.
Endpoints: Degradation rate of test item calculated by the oxygen consumption of the aerobic activated sludge microorganisms after 28 days of incubation.
Test Item Loading Rate (initial concentration in medium C0): 102.5 mg/L corresponding to an oxygen demand of about 184.9 mg/L (ThODNH4)
Reference Item: Sodium Benzoate
Reference Item Loading Rate: 103.3 mg/L corresponding to an oxygen demand of about 172.1 mg/L (ThODNH4)
Test Conditions: 22°C ± 1°C, darkness
Results:
Biodegradation of PTSM: The criterion for ready biodegradability under the conditions of a manometric respirometry test is the degradation of the test item of at least 60%, reached within a 10-day window; the 10-day window starts when the degradation of the test item reaches at least 10% degradation.
The mean biodegradation of 10% of PTSM was reached at day 6 (ThODNH4). At the end of the 10-day window at day 16, the mean degradation of PTSM was 58% (ThODNH4) and therefore the 10 day window criterion was not passed. The mean biodegradation at test end after 28 days was 73% (ThODNH4).
Therefore, PTSM is considered to be readily biodegradable, but failing 10-day window.
Biodegradation of Sodium Benzoate: The reference item sodium benzoate was sufficiently degraded to 93% after 14 days and to 102% after 28 days of incubation, thus confirming the suitability of the aerobic activated sludge inoculum used.
Biodegradation of the Toxicity Control: In the toxicity control containing both, the test item and the reference item sodium benzoate, 45% biodegradation was noted within 14 days and 68% biodegradation after 28 days of incubation. According to the test guidelines, the test item can be assumed to be not inhibitory to the aerobic activated sludge microorganisms because degradation was >25% within 14 days.
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