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Ecotoxicological information

Toxicity to microorganisms

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Reference
Endpoint:
toxicity to microorganisms, other
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Conclusion from guideline study on biodegradability (also assessed by OECD)
Qualifier:
equivalent or similar to
Guideline:
other: see below
Deviations:
not applicable
Principles of method if other than guideline:
OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))
GLP compliance:
no
Analytical monitoring:
no
Test organisms (species):
activated sludge
Test type:
static
Hardness:
Not applicable
Test temperature:
25 °C
pH:
Not applicable
Dissolved oxygen:
Not applicable
Salinity:
Not applicable
Nominal and measured concentrations:
100 mg/L
Details on test conditions:
Activated sludge study
Reference substance (positive control):
no
Duration:
28 d
Effect conc.:
100 mg/L
Remarks on result:
not measured/tested
Details on results:
BOD gave percentage degradation of 83, 94 and 92%
Since the biodegradability of TPP showed a result of 83  - 94 % after 28 d of
incubation with 30 mg/L sludge and 100 mg/L TPP in a test on ready  
biodegradability, there is no significant effect of TPP in the low  
concentration range expected.
Conclusions:
Under the conditions used TPP did not adversely affect the micro-organisms present
Executive summary:

The test was conducted in accordance to "301C, Ready Biodegradability: Modified MITI Test (I)" stipulated in the OECD Guidelines for Testing of Chemicals (1981).

TPP (100 mg/L) was incubated for 28 days at 25 °C with activated sludge (30 mg/L as concentration of suspended solid) in a volume of 300 mL. Degradation was determined by BOD. Under the conditions used TPP did not adversely affect the micro-organisms present, since the biodegradability of TPP showed a result of 83 - 94 %.

Description of key information

TPP (100 mg/L) was incubated for 28 days at 25 °C with activated sludge (30 mg/L as concentration of suspended solid) in a volume of 300 mL. Degradation was determined by BOD. Under the conditions used TPP did not adversely affect the microorganisms present, since the biodegradability of TPP showed a result of 83 - 94 %.

Key value for chemical safety assessment

Additional information