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Environmental fate & pathways

Adsorption / desorption

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Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
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))
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Radiolabelling:
no
Test temperature:
23 °C
Details on study design: HPLC method:
EQUIPMENT
- Temperature: 23 °C
- Reference substance: Acetanilide

Type:
log Koc
Value:
< 1.25
Temp.:
23 °C
Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Calculation from experimentally derived Kow data using an equation from the 2003 EU Technical Guidance Document on Risk Assessment Part III, Chapter 4, Section 4.3
Qualifier:
according to
Guideline:
other: 2003 EU Technical Guidance Document on Risk Assessment Part III, Chapter 4, Section 4.3, p. 26
Principles of method if other than guideline:
Log Koc was calculated using an equation derived from experimentally determined Kow values for analogue structures using the 2003 TGD equation for nonhydrophobic substances.

GLP compliance:
no
Type of method:
other: calculation from experimentally derived Kow
Media:
other: soil and sediment
Radiolabelling:
no
Analytical monitoring:
not required
Type:
log Koc
Value:
-1.11
Type:
Koc
Value:
0.077

Description of key information

Adsorption to the solid soil phase is not expected.

Key value for chemical safety assessment

Additional information

Based on the results of a HPLC measurement according to OECD Guideline 121, the log Koc of 'zinc phthalocyanine sulfonate' was estimated to be < 1.25 (BASF AG 2013). This indicates that the substance will not bind to soils and sediments. To get a defined value, the Koc was additionally estimated according to the EU Technical Guidance Document on Risk Assessment. Based on an experimentally derived log Kow value of -4.1 the log Koc was calculated to be -1.11 (Koc 0.077; BASF SE 2013). The calculation followed the equation for nonhydrophobic substances (log Koc = 0.52 log Pow + 1.02) as it is described 2003 in the EU Technical Guidance Document on Risk Assessment Part III, Chapter 4, Section 4.3 (pp 24 – 27). This value was used for the PNEC derivations.