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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
Remarks:
BOD5/COD
Type of information:
other: read-across from supporting substance (structural analogue or surrogate)
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
Remarks:
the complete read across justification is detailed in section 13, source study has reliability 2.
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
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
Remarks on result:
other: BOD5/COD
Details on results:
none
Parameter:
BOD5
Value:
27 mg O2/g test mat.
Parameter:
COD
Value:
1 021 mg O2/g test mat.
Results with reference substance:
no data

% BOD5/COD = 3

Validity criteria fulfilled:
not specified
Interpretation of results:
not readily biodegradable
Conclusions:
Under the test conditions, the substance showed low biodegradation potential.
Executive summary:

Method

The study was conducted to evaluate the biodegradation potential of the test substance (at ca. 75 % purity) via BOD5 and COD determination.

Results

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

The substance is considered as not rapidly degradable based on a BOD5/COD ratio lower than 0.5.

Key value for chemical safety assessment

Additional information

No information is available on the substance itself, thus the assessment relied on a read across approach. Solvent Orange 062 and Similar Substance 01 are chromium complexes with 2 ligands. In both cases, the 2 ligands have the same chemical structure, i.e. a phenyl ring connected via diazo bond to a phenyl pyrazole. These ligands show minor differences in the position of substituents, i.e. hydroxy and nitro gorups, as well as in the presence of a sulfonate group in Similar Substance 01.

All information about the read across process is inserted in section 13.

Due to the lack of data from ready biodegradability tests, data on BOD5/COD ratio of Simialr Substance 01 was used for the assessement. No evidence of rapid degradation was found in the available study, where a BOD5/COD = 3 % was found.

Moreover, Solvent Orange 062 was predicted to be non ready biodegradable by EPISuite tool (BIOWIN v4.10) using the following smile notation as input: [O-][N+](=O)c1ccc2O[Cr-]6(Oc4c(N=Nc2c1)c(C)nn4c3ccccc3)Oc8ccc(cc8N=Nc7c(C)nn(c5ccccc5)c7O6)[N+]([O-])=O.

On these bases, Solvent Orange 062 was considered as non rapidly degradable.