Karsil [N-(3,4-Dichloropheny1)-2-methylpentamide ] 
Residues isolated from soil samples that were treated with Karsil and 
incubated for 2 weeks were identified as dichloroaniline and tetrachloroazo- 
benzene by gas and thin-layer chromatography, melting points, and infrared 
spectra. Red-brown residues present in extracts of treated soils probably 
represented complex polyaromatic condensation products. In soil that was 
sterilized or treated with the metabolic inhibitors NaN3 and HgClo, gas 
chromatographic analyses did not detect aniline or azo compounds. It was 
concluded that degradation of Karsil was the result of a series of biochemical 
transformations mediated by soil microorganisms (1627). 
ay 
big ails, Wie -NH 
6-650. 
Karsil Dichloroaniline Tetrachloroazobenzene 


Landrin [2,3,5- and 3,4,5-Trimethyl N~methylphenylcarbamate ] 
Metabolism of the two isomers of Landrin was similar on bean 
plants. The major isomer (3,4,5-analog) was degraded to N-hydroxymethyl 
landrin, the 4-hydroxymethyl and possibly the 3-hydroxymethyl analogs. 
The 2,3,5-isomer was degraded to the N-hydroxymethyl and the 3-hydroxy- 
methyl derivatives. Glucuronides of the 3- and 4-hydroxymethyl derivatives 
were also observed (1320). 

0 
o-Att-cit, Q-C-NH-CH3 
CH, CH, 
2,3,5-Landrin 3,4,5-Landrin 
229 
