Benzene, (1-methylethyl)-, oxidized, polyphenyl residues

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption: screening

Type of information:

migrated information: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: guideline study with acceptable modifications

Data source

Reference

Reference Type:

publication

Title:

Sorption of substituted aromatic ketone by soil from Northeastern China.

Author:

Ding Y, Wang L

Year:

2000

Bibliographic source:

Toxicol Environ Chem 78: 1-9

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)

Deviations:

yes

Remarks:

soil/solution ratio: 1:10 g/mL and ion strength of soil water was simulated by a 0.01 M CaCl2 solution

GLP compliance:

not specified

Type of method:

batch equilibrium method

Media:

soil

Test material

Test material information

Constituent 1

Reference substance name:

Acetophenone

EC Number:

202-708-7

EC Name:

Acetophenone

Cas Number:

98-86-2

Molecular formula:

C8H8O

IUPAC Name:

1-phenylethanone

Details on test material:

- Name of test material (as cited in study report): acetophenone
- Substance type: aromatic ketone
- Physical state: liquid (mp: ca. 20°C)
- Analytical purity: >98%
- Impurities (identity and concentrations): not reported

Radiolabelling:

no

Study design

Test temperature:

25°C

Batch equilibrium or other method

Analytical monitoring:

yes

Details on sampling:

- Concentrations: 6 concentrations tested (not further specified)
- Sampling interval: after 24 h
- Sample storage before analysis: no

Details on matrix:

COLLECTION AND STORAGE
- Geographic location: Northeastern China
- Collection procedures: not reported
- Sampling depth (cm): not reported
- Storage conditions: not reported
- Storage length: not reported
- Soil preparation (e.g.: 2 mm sieved; air dried etc.): soil samples were air dried and passed through 80-mesh sieve


PROPERTIES
- Soil texture ( Black soil important agricultural soil in Northern China; no recent history of pesticide application)
- % sand: not reported
- % silt: not reported
- % clay: 27.2
- Soil classification system: silty loam
- pH: 5.86
- Organic carbon (%): 4.78
- Moisture (water content, %): 4.01

Details on test conditions:

TEST CONDITIONS
- Buffer: no
- pH: 5.86
- Suspended solids concentration: not reported

TEST SYSTEM
- Type, size and further details on reaction vessel: centrifuge tube
- Amount of soil/sediment/sludge and water per treatment (if simulation test): 1 g soil
- Soil/sediment/sludge-water ratio (if simulation test): 1:10 g soil/mL CaCl2 solution
- Number of reaction vessels/concentration: test conducted at least in duplicate
- Measuring equipment: UV
- Test performed in closed vessels due to significant volatility of test substance: yes
- Are the residues from the adsorption phase used for desorption: not reported

Duration of adsorption equilibration

Duration:

24 h

pH:

5.86

Computational methods:

Statistical analysis was carried out using the statistical software SPSS 8.0. The regression analysis was performed on adsorption isotherms and QSPR equations.

Results and discussion

Adsorption coefficient

Adsorption coefficient 1

Type:

Koc

Value:

9.4

Adsorption coefficient 2

Type:

log Koc

Value:

0.973

Results: Batch equilibrium or other method

Adsorption and desorption constants:

For acetophenone, the soil sorption coefficient log Koc was determined to 0.9728 (corresponding to a Koc=9.4) at 25°C.

Transformation products:

not measured

Details on results (Batch equilibrium method):

The study was conducted according to OECD Guideline 106 with some modifications. The soil sorption coefficient log Koc of acetophenone was determined to 0.9728 (Koc=9.4).

Any other information on results incl. tables

The study was conducted according to OECD Guideline 106 with some modifications. The soil sorption coefficient log Koc of acetophenone was determined to 0.9728 (Koc=9.4). In respect to acetophenone the linear sorption equation (Cs=Kd x Ce; Cs=sorbed concentration on soil of the chemical at equilibrium (mg/kg), Kd=soil sorption coefficient (dependent on soil texture, eg. organic carbon), Ce=equilibrium concentration in solution (mg/L)) is more desirable than the Freundlich equation to fit the data of sorption experiments because the n values calculated by Freundlich equation were much greater than 1.2, suggesting nonideality.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

Based on the results, binding of acetophenone to soil organic matter is to be expected to be very low (Koc=9.4; log Koc=0.9728)

Executive summary:

The study was conducted according to OECD Guideline 106 with some modifications. The soil sorption coefficient log Koc of acetophenone was determined to 0.9728 (Koc=9.4). In respect to acetophenone the linear sorption equation (Cs=Kd x Ce; Cs=sorbed concentration on soil of the chemical at equilibrium (mg/kg), Kd=soil sorption coefficient (dependent on soil texture, eg.g. organic carbon), Ce=equilibrium concentration in solution (mg/L)) is more desirable than the Freundlich equation to fit the data of sorption experiments because the n values calculated by Freundlich equation were much greater than 1.2, suggesting nonideality.

Based on the results, binding of acetophenone to soil organic matter is to be expected to be very low. The study is regarded as valid.