Registration Dossier

Environmental fate & pathways

Biodegradation in soil

Currently viewing:

Administrative data

Endpoint:
biodegradation in soil, other
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
1995
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
publication
Title:
Transformation of the Glucosinolate-Derived Allelochemicals Allyl Isothiocyanate and Allylnitrile in Soil.
Author:
Borek V, Morra MJ, Brown P and McCaffrey JP
Year:
1995
Bibliographic source:
J. Agric. Food Chem. 1995, 43, 1935-1940

Materials and methods

Principles of method if other than guideline:
Half-life of allyl isothiocyanate in six soils was determined using gas chromatographic analysis of ethyl acetate extracts
GLP compliance:
not specified
Test type:
laboratory

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid

Results and discussion

% Degradationopen allclose all
% Degr.:
29.8
Parameter:
test mat. analysis
Sampling time:
24 h
Remarks on result:
other: average
% Degr.:
97.1
Parameter:
test mat. analysis
Sampling time:
10 d
Remarks on result:
other: average
Half-life / dissipation time of parent compound
Half-life:
>= 20 - <= 74 h
Type:
(pseudo-)first order (= DT50)
Remarks on result:
other: mean half-life in six different soils
Transformation products:
not specified

Applicant's summary and conclusion

Conclusions:
Half-life AITC in soil: 20-60 h.
AITC transformation increased with reduced soil moisture and higher temperatures and occurred more rapidly in soils containing greater concentrations of organic carbon.
No differences between the transformation rates of substrate in Latehco soil and is soil sterilized with ethylene oxide or by autoclaving occurred for AITC.
It is important to consider that disappearance was determined 48h after substrate addition. Differences may become more obvious if longer assay times are used.
No evidence of enhanced degradation from repeated application was observed for AITC in Letahco soil.