Registration Dossier
Registration Dossier
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EC number: 202-851-5 | CAS number: 100-42-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Remarks:
- adsorption
- Type of information:
- other: review data
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Koc estimated from hydrophobics equation from Section 4.3 of Chapter on QSAR in the TGD.
- GLP compliance:
- no
- Type of method:
- other: estimated Koc
- Media:
- other: estimated Koc
- Radiolabelling:
- not specified
- Test temperature:
- not relevant; estimated Koc
- Analytical monitoring:
- no
- Type:
- Koc
- Value:
- 352
- Type:
- log Koc
- Value:
- 2.55
- Validity criteria fulfilled:
- not applicable
- Executive summary:
Styrene was tested for adsorption to soil phase. The Koc of 352 was calculated.
Reference
No measured organic carbon-water partition coefficients (Koc) have been reported for styrene. Using the hydrophobics equation from Section 4.3 of Chapter on QSAR in the TGD for hydrophobic substances (log Koc = 0.81 log Pow + 0.10) and the log Pow of 3.02, a Koc value of 352 is obtained. Values for the partition coefficients between water and soil, sediment and suspended solids based on this Koc value were also derived using respective equations of the TGD:
Kpsoil = 7.04 L/kg, Kpsed = 17.6 L/kg, Kpsusp = 35.2 L/kg. The dimensionless form of Kp, or the total compartment-water partitioning coefficient, were derived as K soil-water = 10.8, K sed-water = 9.6, K susp-water = 9.7.
Description of key information
Since no measured organic-carbon partition coefficients (Koc) have been reported , a Koc of 352 is estimated using the equation from the TGD for hydrophobic substances and the log Kow of 3.02. This value indicates that the mobility of styrene in soil is considered to be moderate.
Adsorption to solid soil phase is possible
Key value for chemical safety assessment
- Koc at 20 °C:
- 352
Additional information
The movement of styrene in a sand aquifer was found to be approximately 80 times slower than that of a non-adsorbing tracer (Environment Canada, 1993). In Fu and Alexander's work (1992) on water and soils, they found that there was significant adsorption to solids, and as expected, the degree of sorption was related to the organic matter content. Sorption seemed to have little effect on the rate of biodegradation.
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