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Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study according to OECD 106

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1988
Report date:
1988

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
GLP compliance:
yes (incl. QA statement)
Type of method:
batch equilibrium method
Media:
soil

Test material

Constituent 1
Chemical structure
Reference substance name:
2,6-dimethylmorpholine
EC Number:
205-509-3
EC Name:
2,6-dimethylmorpholine
Cas Number:
141-91-3
Molecular formula:
C6H13NO
IUPAC Name:
2,6-dimethylmorpholine
Details on test material:
- Name of test material (as cited in study report): 2,6-dimethylmorpholine
- Other: metabolite of tridemorph
Radiolabelling:
yes

Study design

Test temperature:
20-22 °C

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
Recovery test in aqueous soil extracts:
- 20 g of soil were shaken with 100 m1 0.01 M aqueous calcium chloride solution on a mechanical shaker for 90 min
- the soil-water suspension was then centrifuged
- the water extract was decanted from the soil residue
- 10 m1 aliquot of the water extract (corresponding to 2 g soil) was fortified with 2.6-dimethylmorpholine in four different concentrations equal to approx. 0.05, 0.2., 1 and 5 mg/l
- 1 m1 aliquot of the fortified water extract was then radioassayed

Adsorption screening test:
- 2 g soil were shaken with 10 m 1 0.01 M aqueous calcium chloride solution containing approx. 5 mg/l Tridemorph on 8 mechanical shaker f o r 16 hours
- the soil/water suspension was then centrifuged
- the water extract was decanted from the soil residue and the water volume was measured
- 1 ml aliquot of the water extract was then radioassayed.

Results and discussion

Results: Batch equilibrium or other method

Recovery of test material:
On all four treated soils less than 25 % (0.9 - 16 %) of the 2,6-dimethylmorpholine are adsorbed. Therefore, according to OECD 106, no further investigations were carried out.

Applicant's summary and conclusion

Conclusions:
Leaching of 2,6-dimethylmorpholine into deeper soil layers cannot be excluded.

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