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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
other: estimation
Adequacy of study:
weight of evidence
Study period:
2001
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method

Data source

Reference
Reference Type:
other: expert statement
Title:
Unnamed
Year:
2001
Report date:
2001

Materials and methods

Principles of method if other than guideline:
Estimation
GLP compliance:
no
Type of method:
other: estimation
Media:
soil

Test material

Constituent 1
Reference substance name:
Blue REg 6080
IUPAC Name:
Blue REg 6080

Study design

Batch equilibrium or other method

Computational methods:
The estimation was performed based on a water solubility of below 0.06 mg/I using regression equations (Lyman, Reehl, Rosenblatt: Handbook of Chemical Property Estimation Methods, 1990) and relating the Koc with the water solubility.
Furthermore, the molecular weight of test item, 626.5 g/mol was used.
Regression I: log Koc = -0.55 log S + 3.64 (S in mg/I)
Regression II: log Koc = -0.54 log S + 0.44 (S in mole fraction)
Regression Ill: log Koc = -0.557 log S + 4.277 (S in μmoles/I)

Additionally, an estimation was performed based on the octanol/water partition coefficient of log Pow= 3.3 using a regression equation (source as above)
relating the Koc with Pow.
Regression IV: log Koc = 0.544 · log Pow + 1.377

Results and discussion

Adsorption coefficientopen allclose all
Type:
Koc
Value:
1 487 dimensionless
Remarks on result:
other: calculation based on log Pow of 3.3
Type:
Koc
Value:
> 20 512 dimensionless
Remarks on result:
other: calculation based on water solubility < 0.06 mg/l

Applicant's summary and conclusion

Conclusions:
Based on a log Pow of 3.3, Koc is1487 indicating that test item is little mobile in soils.
Based on a water solubility of less than 0.06 mg/l, Koc is 20512 or higher, thus test item is classified as immobile in soils.