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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
biodegradation in water: screening test, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
no data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
The 5-day Biological Oxygen Demand (BOD5) was measured at 10 g/L (at 5, 10, 20 or 25 mL/500 mL).
The Chemical Oxygen Demand (COD) was measured by titration.
GLP compliance:
no
Specific details on test material used for the study:
not applicable
Oxygen conditions:
not specified
Inoculum or test system:
not specified
Details on inoculum:
no data
Duration of test (contact time):
5 d
Details on study design:
no data
Preliminary study:
no data
Test performance:
no data
Key result
Remarks on result:
not measured/tested
Details on results:
none
Key result
Parameter:
BOD5
Value:
27 mg O2/g test mat.
Key result
Parameter:
COD
Value:
1 021 mg O2/g test mat.
Key result
Parameter:
BOD5*100/COD
Value:
3
Results with reference substance:
no data

none

Validity criteria fulfilled:
not specified
Interpretation of results:
under test conditions no biodegradation observed
Conclusions:
The substance showed low biodegradation potential.
Executive summary:

A study was conducted to evaluate the biodegradation potential of the test substance (at ca. 75 % purity) via BOD5 and COD determination. The ratio of these values was equivalent to 0.03, suggesting low biodegradation potential of the substance under the test conditions.

Description of key information

A study was conducted to evaluate the biodegradation potential of the test substance (at ca. 75 % purity) via BOD5 and COD determination. The ratio of these values was equivalent to 0.03, suggesting low biodegradation potential of the substance under the test conditions. Additionally, by the nature of their design and use, acid dyes are not intended to be readily biodegradable as this would assist in the rapid destruction of the dyestuff, rendering it unfit for purpose. As such, it is accepted that such substances are not readily biodegradable under relevant environmental conditions. A published study (Pagga & Brown, 1986) describes the results of the testing of 87 dyestuffs in short-term aerobic biodegradation tests. The authors of this publication concluded that dyestuffs are very unlikely to show any significant biodegradation in such tests and that 'there seems little point in carrying out such test procedures’ on dyestuffs. There are ISO, European, American (AATCC) and national standards for the colour fastness of dyes. Dyes are required to have specific fastness properties. If the dyes were biodegradable, it would not be possible for them to have these fastness properties.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information