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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Method may not be optimal for organic pigments with very low solubility in both water and solvents

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method

Test material

Constituent 1
Chemical structure
Reference substance name:
1-(4-methyl-2-nitrophenylazo)-2-naphthol
EC Number:
219-372-2
EC Name:
1-(4-methyl-2-nitrophenylazo)-2-naphthol
Cas Number:
2425-85-6
Molecular formula:
C17H13N3O3
IUPAC Name:
1-[(4-methyl-2-nitrophenyl)diazenyl]-2-naphthol
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
Purity: 98.9%
Radiolabelling:
no

Study design

Batch equilibrium or other method

Analytical monitoring:
yes

Results and discussion

Adsorption coefficient
Type:
log Koc
Value:
> 5.63
Temp.:
30 °C

Applicant's summary and conclusion

Validity criteria fulfilled:
yes
Conclusions:
This value indicates that the test item is environmentally immobile.
Executive summary:

The adsorption coefficient of Pigment Red 3 has been determined to be greater than 4.27 x 10E5,

log10 Koc >5.63, using the HPLC screening method, designed to be compatible with Method 121

of the OECD Guidelines for Testing of Chemicals, 22 January 2001 and Method C19 Adsorption

Coefficient of Commission Regulation (EC) No 440/2008 (as amended) of 30 May 2008. This

value indicates that the test item is environmentally immobile.