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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
not specified
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to
Guideline:
OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)
Deviations:
not specified
Qualifier:
according to
Guideline:
OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
Deviations:
not specified
GLP compliance:
not specified
Remarks:
the test was conducted in an academic setting without GLP certification
Oxygen conditions:
aerobic
Inoculum or test system:
sewage, predominantly domestic, non-adapted
Details on inoculum:
- Source of inoculum/activated sludge: STP of Lüneburg, Germany (144,000 inhabitant
equivalents)
- Initial cell/biomass concentration: two drops of effluent per L
Duration of test (contact time):
28 d
Key result
Parameter:
% degradation (O2 consumption)
Value:
-1.1
St. dev.:
1.3
Sampling time:
28 d
Remarks on result:
other: OECD 301D (CBT)

Biodegradation test results obtained in the present study. For each experiment the % O2consumption in the two parallel bottles is given, and for valid results the average ±SD, otherwise the criterion rendering a result invalid.

Compound name

(abbreviation)

[CAS-RN]

Experiment number

OECD 301D (CBT)

OECD 301F (MRT)

O2Consumption/

ThOD [%]

Average in a valid experiment ±SD

O2Consumption/ ThOD [%]

Average in a valid experiment ±SD

Bis(2-mercaptoethyl) sulfide
(DMDS)

[3570-55-6]

1

-0.2, -2.0

-1.1 ±1.3

35.8, -12.9

not valid,

criterion 1

2*

1.8, 33.4

not valid,

criterion 1

*due to poor solubility, this substance was directly weighed in MRT

 

Validity criteria fulfilled:
yes
Interpretation of results:
not readily biodegradable
Conclusions:
DMDS is not readily biodegradable

Description of key information

HIDT is assumed to be not readily biodegradable

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:
freshwater

Additional information