Registration Dossier

Administrative data

Endpoint:
biodegradation in soil
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1992
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Well documented study which follows generally accepted scientific principles.

Data source

Reference
Reference Type:
publication
Title:
Loss of Organic Chemicals in Soil: Pure Compound Treatability Studies
Author:
Loehr RC, Matthews JE
Year:
1992
Bibliographic source:
Journal of Soil Contamination 1 (4); 339-360

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
In order to determine the loss rate of the test substance aerobic batch laboratory microcosm experiments with different soils were used.
GLP compliance:
not specified
Test type:
laboratory

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Oxygen conditions:
aerobic
Soil classification:
other: natural soils
Soil propertiesopen allclose all
Soil no.:
#1
Soil type:
other: Typic Paleudults
% Clay:
8.6
% Silt:
23.4
% Sand:
68
% Org. C:
0.94
pH:
4.8
CEC:
6.4 meq/100 g soil d.w.
Soil type:
Mollisol
% Clay:
7.4
% Silt:
31.1
% Sand:
61.5
% Org. C:
3.25
pH:
7.8
CEC:
10.8 meq/100 g soil d.w.
Details on soil characteristics:
Exture of soil no.1 is a sandy loam; Texture of soil no. 2 is a sandy silt loam
Duration of test (contact time)open allclose all
Soil No.:
#1
Duration:
64 d
Soil No.:
#2
Duration:
64 d
Initial test substance concentrationopen allclose all
Soil No.:
#1
Initial conc.:
500 mg/kg soil d.w.
Based on:
test mat.
Soil No.:
#2
Initial conc.:
250 mg/kg soil d.w.
Based on:
test mat.
Parameter followed for biodegradation estimation:
test mat. analysis
Experimental conditionsopen allclose all
Soil No.:
#1
Temp.:
20°C
Humidity:
80 % of field capacity
Soil No.:
#2
Temp.:
20°C
Humidity:
80 % of field capacity

Results and discussion

Half-life / dissipation time of parent compoundopen allclose all
Soil No.:
#1
DT50:
5.1 d
Type:
(pseudo-)first order (= half-life)
Remarks on result:
other: r²=0.88
Soil No.:
#2
DT50:
1.6 d
Type:
(pseudo-)first order (= half-life)
Remarks on result:
other: r²=0.83
Transformation products:
not measured
Details on transformation products:
no transformation products detected

Any other information on results incl. tables

The recovery efficiencies for the test substance in the soils were 57 % and 63 %. The chemical concentrations were corrected by the recovery efficiencies.

Applicant's summary and conclusion