Lactofen

Field studies

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

Test material information

Constituent 1

Reference substance name:

(2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate

EC Number:

616-466-9

Cas Number:

77501-63-4

Molecular formula:

C19H15ClF3NO7

IUPAC Name:

(2-ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate

Constituent 2

Reference substance name:

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate

IUPAC Name:

(2-Ethoxy-1-methyl-2-oxoethyl)-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2-nitrobenzoate

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.