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Environmental fate & pathways

Field studies

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Administrative data

Endpoint:
field studies
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1985
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
other company data
Title:
Unnamed
Year:
1985
Report Date:
1985

Materials and methods

Principles of method if other than guideline:
Field Dissipation Study
GLP compliance:
not specified
Type of measurement:
field measurements
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: particulates
Details on test material:
not reported

Results and discussion

Any other information on results incl. tables

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate was rapidly dissipated with 0.01 ppm left at d 19.

Its primary metabolite, 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoyl-lactic acid, was still detectable at d 19 but had decreased below limit of detection on d 21.

The second metabolite, 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoic acid, dissipated to low levels by d 21 but was still detectable as late as 131 d after both treatments (0.01 ppm and 0.04 ppm, respectively).

Due to the rainfall both metabolites were leached only 5 -10 cm into the soil.

Recoveries at the 0.12-0.19 ppm (mean of 6 replicates, +/- standard deviation) level were

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate 96 +/- 16.5 %

5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoyl-lactic acid 95 +/- 13.5 %

5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoic acid 101 +/- 14.9

Applicant's summary and conclusion

Conclusions:
(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate and its metabolites 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoyl-lactate and 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoic acid, are dissipated and there is no risk of accumulation in the soil
Executive summary:

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate dissipation was studied in loam soil rich in organic matter (6.3% w/w). Applications of 0.25 and 0.5 pounds/acre of (2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate (on June 16, 1983) were followed by 13 cm of precipitation the next 19 days.

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate was rapidly dissipated with 0.01 ppm left at d 19.

Its primary metabolite, 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoyl-lactic acid, was still detectable at d 19 but had decreased below limit of detection on d 21.

The second metabolite, 5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoic acid, dissipated to low levels by d 21 but was still detectable as late as 131 d after both treatments (0.01 ppm and 0.04 ppm, respectively. Although applied shortly before heavy rainfall, both metabolites were leached only 5 -10 cm into the soil.