Registration Dossier

Environmental fate & pathways

Field studies

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Administrative data

Endpoint:
field studies
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP Guidleine study, however, no information on storage stability was provided in the study report

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1993
Report Date:
1993

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: BBA Guideline Teil IV/4-1 (1986)
GLP compliance:
yes
Type of measurement:
other: dissipation in soil
Media:
Soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
TS-Freetext:
Duiron Bayer
Purity: 80.20% active ingredient content
batch no. 232071107

Results and discussion

Any other information on results incl. tables

No parent or metabolite was detected in any of the trial site control samples at the start and end of the study

Both Diuron and the metabolite Desmethyl-diuron remained in the top 0 to 10 cm layer of the soil cores throughout the course of the experimental period. Only few and low concentrations were found in deeper soil layers indicating the immobility of both substances

Dissipation proceeded moderately and continuously with time. The decline of Diuron in the single trials fits well with the calculated degradation curves except for the trial in Massen in which Diuron residues did not follow a continuous decline pattern but produced highly variable results

Half life values were determined following a first order fit to range between 59 and 298 days (n=5), DT90values were extrapolated for 3 locations and ranged from 197 to 265 days (n=3)

Applicant's summary and conclusion

Executive summary:

In the soil type tested, Diuron showed a slow to moderate dissipation under natural field conditions and is not prone to move down the soil column