Registration Dossier
Registration Dossier
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EC number: 202-805-4 | CAS number: 99-97-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Data is from authoritative databases
- Justification for type of information:
- Data is from authoritative databases
- Qualifier:
- according to guideline
- Guideline:
- other: as mentioned below
- Principles of method if other than guideline:
- Soil adsorption coefficient (Koc) of test chemical was estimated using a log Kow and a regression derived equation.
- GLP compliance:
- not specified
- Type of method:
- other: no data available
- Media:
- soil
- Radiolabelling:
- not specified
- Analytical monitoring:
- not specified
- Computational methods:
- - Other: Koc value of test chemical was estimated using a log Kow of 2.81 and a regression derived equation.
- Key result
- Type:
- Koc
- Value:
- 260 dimensionless
- Remarks on result:
- other: Log Koc= 2.414
- Transformation products:
- not specified
- Validity criteria fulfilled:
- not specified
- Conclusions:
- The adsorption coefficient (Koc) value of test chemical was estimated to be 260 calculated using a log Kow and a regression derived equation.
- Executive summary:
Adsorption study was conducted for estimating the adsorption coefficient (Koc) value of test chemical. The adsorption coefficient (Koc) value was calculated using a log Kow of 2.81 and a regression derived equation. The adsorption coefficient (Koc) value of test chemical was estimated to be 260 (Log Koc = 2.414). This Koc value indicates that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
Reference
According to a classification scheme, the estimated Koc value suggests that test chemical was expected to have moderate mobility in soil.
Description of key information
Adsorption study was conducted for estimating the adsorption coefficient (Koc) value of test chemical. The adsorption coefficient (Koc) value was calculated using a log Kow of 2.81 and a regression derived equation. The adsorption coefficient (Koc) value of test chemical was estimated to be 260 (Log Koc = 2.414). This Koc value indicates that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
Key value for chemical safety assessment
- Koc at 20 °C:
- 260
Additional information
Data from various sources for the test chemical and structurally and functionally similar read aacross chemicals were reviewed for the adsorption end point which are summarized as below:
Adsorption study was conducted for estimating the adsorption coefficient (Koc) value of test chemical. The adsorption coefficient (Koc) value was calculated using a log Kow of 2.81 and a regression derived equation. The adsorption coefficient (Koc) value of test chemical was estimated to be 260 (Log Koc = 2.414). This Koc value indicates that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
KOCWIN model of Estimation Programs Interface was used to predict the soil adsorption coefficient i.e Koc value of test chemical. The soil adsorption coefficient i.e Koc value of test chemical was estimated to be 126.2 L/kg with log Koc value of 2.1011 by means of MCI method at 25°C. This Koc value indicates that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
Similarly the Soil Adsorption Coefficient i.e Koc value of test chemical was estimated using predicted database. The adsorption coefficient i.e. Koc value of the test chemical was estimated to be 332.40 (Log Koc was 2.52) at pH 5.5 and 770.34 (Log Koc was 2.88) at pH 7.4, respectively. This Koc value indicates that the test chemical has a moderate sorption to soil and sediment and therefore have slow migration potential to ground water.
Above studies further supported by the weight of evidence study from authoritative databases. The adsorption study was conducted for determining the adsorption coefficient (Koc) value of test chemical. The study was performed using 4 silt loam soils over a pH ranging from 6.1 to 7.5, respectively. The adsorption coefficient (Koc) value of test chemical was determined to be 44 dimensionless (Log Koc = 1.643). This Koc value indicates that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
Thus, based on the above all studies and Koc value observation, it was concluded that the test chemical has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.
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