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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption
Remarks:
adsorption
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
weight of evidence
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Study not performed according to standard guideline nor GLP. The report is not sufficiently well documented to assess the reliability of the results.Peer reviewed data.

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
2005
Report Date:
2005

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Calculation based on measured concentrations in groundwater and sediment. To estimate a soil Kd, ground water Al concentration and soil (sediment) Al concentration were used. Al groundwater concentrations vary in E-area between 0.0178 to 0.216 mg/L (EGIS; http://egis1.srs.gov/Website/sgcp_wasteunits/viewer.htm). An average Al concentration of sediments on SRS is 8,060 mg/kg for 168 samples. Dividing the soil Al concentration by the groundwater Al concentration, yields a ratio of >37,000 mL/g. To provide some level of conservatism a value 1/10, 3,700 mL/g, was used.
GLP compliance:
no
Type of method:
other: calculation
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
No data
Specific details on test material used for the study:
Details on properties of test surrogate or analogue material (migrated information):
No data

Study design

Test temperature:
No data

HPLC method

Details on study design: HPLC method:
No data

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
To estimate a soil Kd, ground water Al concentration and soil (sediment) Al concentration were used. Al groundwater concentrations vary in E-area between 0.0178 to 0.216 mg/L (EGIS; http://egis1.srs.gov/Website/sgcp_wasteunits/viewer.htm). An average Al concentration of sediments on SRS is 8,060 mg/kg for 168 samples.
Details on matrix:
No data
Details on test conditions:
No data
Computational methods:
To estimate a soil Kd, ground water Al concentration and soil (sediment) Al concentration were used. Al groundwater concentrations vary in E-area between 0.0178 to 0.216 mg/L (EGIS; http://egis1.srs.gov/Website/sgcp_wasteunits/viewer.htm). An average Al concentration of sediments on SRS is 8,060 mg/kg for 168 samples. Dividing the soil Al concentration by the groundwater Al concentration, yields a ratio of >37,000 mL/g. To provide some level of conservatism a value 1/10, 3,700 mL/g, was used.

Results and discussion

Adsorption coefficient
Type:
Kd
Value:
3 700
Remarks on result:
other: not stated

Results: HPLC method

Details on results (HPLC method):
No data

Results: Batch equilibrium or other method

Adsorption and desorption constants:
Dividing the soil Al concentration by the groundwater Al concentration, yields a ratio of >37,000 mL/g. To provide some level of conservatism a value 1/10, i.e. 3,700 mL/g, was used.
Recovery of test material:
No data
Concentration of test substance at end of adsorption equilibration period:
No data
Concentration of test substance at end of desorption equilibration period:
No data

Any other information on results incl. tables

Aluminium sorption to sediments is controlled largely by solubility and to a lesser extent by adsorption.

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
Aluminium sorption to sediments is controlled largely by solubility and to a lesser extent by adsorption. Dividing the soil Al concentration by the groundwater Al concentration, yields a ratio of >37,000 mL/g. To provide some level of conservatism a value 1/10, 3,700 mL/g, was used.
Executive summary:

To estimate a soil Kd, ground water Al concentration and soil (sediment) Al concentration were used. Al groundwater concentrations vary in E-area between 0.0178 to 0.216 mg/L (EGIS; http://egis1.srs.gov/Website/sgcp_wasteunits/viewer.htm). An average Al concentration of sediments on SRS is 8,060 mg/kg for 168 samples. Dividing the soil Al concentration by the groundwater Al concentration, yields a ratio of >37,000 mL/g. To provide some level of conservatism a value 1/10, 3,700 mL/g, was used.