Registration Dossier
Registration Dossier
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EC number: 635-156-4 | CAS number: 109293-98-3
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air:
The test substance (diflufenzopyr sodium salt) degrades in the atmosphere with a DT50 value of 0.233 days (24-hr day; corresponding to 5.593 hours). As the test substance contains no olefinic carbon-carbon double and acetylic triple bonds, it is not expected to react with ozone.
Hydrolysis:
The hydrolysis rate of the test substance (diflufenzopyr) was determined at 1 ppm concentration in pH 5.0, pH 7.0, and pH 9.0 buffered aqueous solutions at 25 °C. The hydrolysis rate was 0.0538 ± 0.0038 day-1 at pH 5.0, 0.0290 ± 0.0011 day-1 at pH 7.0 and 0.0270 ± 0.0015 day-1 at pH 9.0. Thus the half-life of the test substance's hydrolysis was determined to be 12.9 days at pH 5.0, 23.9 days at pH 7.0 and 25.6 days at pH 9.0
Phototransformation in water:
Photolysis of 14C-labelled test substance (diflufenzopyr) (pyridine and phenyl labels) was conducted in aqueous buffer of pH 5, 7 and 9 at 22 ± 1° C under sterile conditions. The average degradation half-lives were about 16 days (pH 5), 27 days (pH 7) and 22 days (pH 9). The test substance also degraded in the dark control buffers of pH 5, 7 and 9. The average degradation half-lives were about 24 days (pH 5), 39 days (pH 7) and 41 days (pH 9). The test substance degraded to a large number of products (>14). The test substance, M1, M2, M6, M7, M23, M24, P2, P5 and P11 were major degradation products. Rest of the degradation products were minor and none exceeded ~6% TAR.
Phototransformation in soil:
A photolysis study with 14C-labelled test substance (diflufenzopyr) (phenyl and pyridine labels) was conducted on soil at 22 ± 1° C for 15 days for phenyl label and for about 18 days for pyridine label. The test substance degraded with a moderate rate under photolytic conditions with a half-life of about 10 days. The test substance in dark control samples degraded slowly compared to photolyzed samples and had a half-life about 20 days. The test substance degraded to a large number of products. M1 and M6 were the only degradation products found in excess of 10% TAR. The test substance itself was the largest radioactive residue at every sampling interval with the exception of the last sampling interval in the case of pyridine label in which M6 was the largest product.
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