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Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
37 days
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Qualifier:
according to
Guideline:
OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))
Qualifier:
according to
Guideline:
EU Method C.19 (Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge Using High Performance Liquid Chromatography (HPLC))
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Specific details on test material used for the study:
Batch 135214 of Disperse Blue 359 was a dark blue powder with a purity of 99%.
Radiolabelling:
not specified
Test temperature:
35 °C
Details on study design: HPLC method:
Stock solutions of the reference substance at concentrations of 1000 mg/L in methanol were used. 10 µL of the stock solution was within the 390 µL tetrahydrofuran and 400 µL of 0.1 M phosphate buffer pH 7. The blank solution for the mixture of reference substances was 1/3960 (v/v) methanol/tetrahydrofuran /0,1M phosphate buffer pH 7.
A 1000 mg/L stock solution of the test item was prepared in tetrahydrofuran. The stock solution and the solutions of reference substances were diluted to obtain an end solution of 40/60 (v/v) tetrahydrofuran/0.1M phosphate buffer pH 7. The final concentration of the test item was 10.0 mg/L. The test item blank solution was 40/60 (v/v) tetrahydrofuran/0.1M phosphate buffer pH 7.
The reference substance and test item solutions were injected in duplicate. Blank solutions were analysed by single injection.
Key result
Type:
Koc
Value:
ca. 4 200 dimensionless
pH:
7
Temp.:
35 °C
Type:
log Koc
Value:
ca. 3.62 dimensionless
pH:
7
Temp.:
35 °C
Details on results (HPLC method):
The UPLC-UV chromatograms for the test item solution showed a single test item peak. The Koc and logKoc values of the test item at pH 7 were 4.2x103 and 3.62 respectively.
Validity criteria fulfilled:
yes
Conclusions:
The HPLC method using soil-adsorption-reference was applied for the determination of the adsorption coefficient (Koc) of Disperse Blue 359. The Koc and logKoc values of the test item at pH 7 were 4.2x103 and 3.62 respectively.
Executive summary:

The HPLC method using soil-adsorption-reference was applied for the determination of the adsorption coefficient (Koc) of Disperse Blue 359. The Kocand logKocvalues of the test item at pH 7 were 4.2x103and 3.62 respectively.

Description of key information

The HPLC method using soil-adsorption-reference was applied for the determination of the adsorption coefficient (Koc) of Disperse Blue 359. The Kocand logKocvalues of the test item at pH 7 were 4.2x103and 3.62 respectively.

Key value for chemical safety assessment

Koc at 20 °C:
4 200

Additional information

The HPLC method using soil-adsorption-reference was applied for the determination of the adsorption coefficient (Koc) of Disperse Blue 359. The Kocand logKocvalues of the test item at pH 7 were 4.2x103and 3.62 respectively.

[LogKoc: 3.62]