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Environmental fate & pathways

Adsorption / desorption

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Reference
Endpoint:
adsorption / desorption, other
Remarks:
ADSORPTION COEFFICIENT (KOC)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
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))
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC estimation method
Media:
soil/sewage sludge
Test temperature:
25 ºC
Details on study design: HPLC method:
Column: Spherisorb CN 250 mm*4,6 mm*5 μm (ID LC160)
Column Temperature: 25 ºC
Detector DAD: 204, 210, 220, 230, 240, 270, 280, 252 nm
Mobile Phase: ammonium citrate buffer 0,01 M: methanol; 45:55 (v/v)
Flow: 1 ml/min
Injection: 5 μl
Elution: Isocratic Elution
Run time: 15 min
Analytical monitoring:
not specified
Sample No.:
#1
Type:
log Koc
Value:
ca. 2.01 dimensionless
Temp.:
25 °C
Sample No.:
#2
Type:
log Koc
Value:
ca. 4.9 dimensionless
Temp.:
25 °C
Details on results (HPLC method):
The determination of Adsorption Coefficient Koc of diethyl ethylphosphonate (batch 170623) was carried out on 2 independent sample aliquots (analysis performed on April 17th 2018). Two different peaks at 252 nm were obtained for diethyl ethylphosphonate sample at retention time 3,7 min and 5,9 min. Both peaks were evaluate in the present study.
Mean value of log Koc of diethyl ethylphosphonate (batch 170623) peak 1 derived from two repeated measurements using two different linearity equations is 2,01 and log Koc difference between measurements is 0,01 within a range of ± 0,25 log units.
Mean value of log Koc of diethyl ethylphosphonate (batch 170623) peak 2 derived from two repeated measurements using two different linearity equations is 4,90 and log Koc difference between measurements is 0,01 within a range of ± 0,25 log units.
Conclusions:
Diethyl ethylphosphonate (batch 170623) was analyzed by HPLC /DAD in duplicate in order to determine Adsorption Coefficient Koc, according to the method OECD 121 (Estimation of the Adsorption Coefficient). Two different peaks were obtained for Diethyl ethylphosphonate (batch 170623) at 252 nm. Mean value of log Koc of diethyl ethylphosphonate (batch 170623) peak 1 was 2,01; mean value of log Koc of diethyl ethylphosphonate (batch 170623) peak 2 was 4,90.

Description of key information

Key value for chemical safety assessment

Koc at 20 °C:
2.01

Additional information