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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
key study
Study period:
10.03.2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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))
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 (incl. certificate)
Type of method:
HPLC estimation method
Details on study design: HPLC method:
EQUIPMENT
- Apparatus: HPLC System Agilent 1100 series
- Type, material and dimension of analytical (guard) column: commercially available cyanopropyl solid phase containing lipophilic and polar moieties, stainless steel, 5 µM

MOBILE PHASES
- Type: methanol/distilled water
- pH: 5.4

DETERMINATION OF DEAD TIME
- Method: by inert substances which are not retained by the column

REFERENCE SUBSTANCES
- Identity: Acetanilide, Atrazin, Triadimenol, Linuron, Pyrazophos, Diclofop-methyl, 4,4`-DDT

REPETITIONS
- Number of determinations: 2

EVALUATION
- Calculation of capacity factors k': according to OECD TG 121
- Determination of the log Koc value: according to OECD TG 121
Key result
Type:
log Koc
Value:
> 5.6 dimensionless
pH:
5.4
Temp.:
25 °C
Details on results (HPLC method):
- Average retention data for test substance: retention time = 10.44 (1st measurement), 10.48 (2nd measurement)
Validity criteria fulfilled:
yes
Conclusions:
The log KOC of the test substance was > 5.6.

Description of key information

The adsoprtion coefficient (log KOC) of the test item was determined to be greater than 5.6 according to OECD Guideline 121. Since the logKOC is greater than 3 the test substance has a adsoprtion potential.

Key value for chemical safety assessment

Koc at 20 °C:
398 107

Additional information