TCA

Field studies

Administrative data

Endpoint:

field studies

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Data on sampling and analytical method are provided. No GLP.

Data source

Reference

Reference Type:

publication

Title:

Residues in Crops Irrigated with Water Containing Trichloroacetic Acid

Author:

Demint RJ, Pringle JC, Hattrup A, Bruns VF, Frank PA

Year:

1975

Bibliographic source:

J. Agr. Food Chem., Vol. 23, No. 1.

Report date:

1974

Materials and methods

Principles of method if other than guideline:

Ten field and vegetable and three fruit crops were irrigated with water that contained about 0.1 and 0.5 ppm of trichloroacetic acid. Grapes were treated at 0.17 and 1.39 ppm. Alfalfa, corn, garden peas, potatoes, field-bean pods and seed, snapbean herbage and watermelon were treated at 0.5 ppm. Apple fields were treated at 0.1 ppm.

GLP compliance:

no

Type of measurement:

Water samples were acidified and extracted with ether; then they were partitioned into buffer and back to ether and analyzed by electron-capture gas chromatography. Recoveries of TCA from fortified water averaged 87%.
Soil samples were slurried with water and acidified to a pH of 0.9 with hydrochloric acid. The slurries were shaken for 1 hr, and the acid extracts were then analyzed by a procedure similar to the water analysis. Recoveries of TCA from fortified control soils were 86 and 77% at the 0.1- and 0.05-ppm Ievels, respectively. All water and soil analyses were corrected for recovery.
The analytical method used for TCA in crops was based on a procedure developed for TCA in wheat grain (Chiba and Morley, 1966). The method was subsequently modified for the determination of TCA in sugar beets and various by-products of the beet-sugar industry (Hanzas, 1971).

Media:

Field and vegetable and three fruit crops.

Test material

Test material information

Constituent 1

Reference substance name:

TCA

EC Number:

211-479-2

EC Name:

TCA

Cas Number:

650-51-1

Molecular formula:

C2HCl3O2.Na

IUPAC Name:

trichloroacetic acid

Details on test material:

- Name of test material (as cited in study report): TCA

Results and discussion

Any other information on results incl. tables

Trichloroacetic acid residues were not detected in peaches, sugar beets, wheat, or tomatoes. Minute amounts of test substance (0.01-0.04 ppm) were detected in alfalfa, corn, garden peas, potatoes, and watermelon treated at 0.5 ppm. Slightly higher residues of Trichloroacetic acid, ranging from 0.13 to 0.43 ppm, were detected in field-bean pods and seed, and snapbean herbage treated at 0.5 ppm. Apples treated at 0.1 ppm contained 0.19 ppm of residue, and grapes contained 0.03 and 0.20 ppm when treated at lower and higher rates, respectively. Of the two crops that were sprinkler and furrow irrigated with Trichloroacetic acid -treated water, the only difference was in pods of furrow-irrigated field-beans, which contained maximum Trichloroacetic acid residues of 0.19 ppm, compared to pods of sprinkler-irrigated beans, which contained 0.03 ppm. At harvest, residues had disappeared from most crops, except apples, field-bean pods and seed, garden peas, and grapes, which contained 0.19, 0.19, 0.13, 0.02, and 0.20 ppm of Trichloroacetic acid, respectively.

Applicant's summary and conclusion

Conclusions:

Trace concentrations (0.01–0.20 ppm [0.01–0.20 mg/kg]) have been detected in vegetables and fruits from fields irrigated with water containing trichloroacetic acid; slightly higher levels (0.13–0.43 mg/kg) were detected in field bean pods and seeds.

Executive summary:

Ten field and vegetable and three fruit crops were irrigated with water that contained about 0.1 and 0.5 ppm of trichloroacetic acid. Grapes were treated at 0.17 and 1.39 ppm.

Trichloroacetic acid residues were not detected in peaches, sugar beets, wheat, or tomatoes. Minute amounts of test substance (0.01-0.04 ppm) were detected in alfalfa, corn, garden peas, potatoes, and watermelon treated at 0.5 ppm. Slightly higher residues of Trichloroacetic acid, ranging from 0.13 to 0.43 ppm, were detected in field-bean pods and seed, and snapbean herbage treated at 0.5 ppm. Apples treated at 0.1 ppm contained 0.19 ppm of residue, and grapes contained 0.03 and 0.20 ppm when treated at lower and higher rates, respectively. Of the two crops that were sprinkler and furrow irrigated with Trichloroacetic acid -treated water, the only difference was in pods of furrow-irrigated field-beans, which contained maximum Trichloroacetic acid residues of 0.19 ppm, compared to pods of sprinkler-irrigated beans, which contained 0.03 ppm. At harvest, residues had disappeared from most crops, except apples, field-bean pods and seed, garden peas, and grapes, which contained 0.19, 0.19, 0.13, 0.02, and 0.20 ppm of Trichloroacetic acid, respectively.