crIPpc (Chloropropham) [Isopropyl N-(3-chloropheny1l) carbamate] 
CEPC [2-Chloroethy1-N-(3-chlorophenyl) carbamate] 
PC (Propham) [Isopropyl N-phenylcarbamate] 
First order rate constants in terms of reciprocal time and heat of 
activation (H,) were derived for IPC and CIPC (Burschell and Freed, 1959). 
re) -1 

r°C k (day ~4) H, 
2 
IPC 15 4.67 x 10, 7,768 
29 8.79 x 10 
CIPC 15 4.25 x 1073 21,247 
29 2.39 x 10 

When app lied to plants, IPC was metabolized to the corresponding 
>N-OH analog (Baskalov and Zemskaya, 1957). 
In recent studies a bacterium, Pseudomonas sp., was found in soil 
that hydrolyzed phenylcarbamate herbicides to the corresponding aniline. 
While this is a general reaction for the phenylcarbamate esters, urea 
analogs were not hydrolyzed (Kearney and Kaufman, 1965a, b; Kearney, 
1965). 
Pseudomonas striata, a flavobacterium, an agrobacteriun, and an 
achromobacter were able to degrade CIPC, as demonstrated by production of 
3-chloroaniline and subsequent liberation of chloride. An achromobacter 
and an arthrobacter were able to degrade CEPC (Kaufman and Kearney, 1965). 
