Studies on photodegradation of chlorimuron-ethyl in soil

✍ Scribed by Choudhury, Partha P.; Dureja, Prem

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 197 KB
• Volume: 51
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199710)51:2<201::aid-ps618>3.0.co;2-9

✦ Synopsis

Photolysis of chlorimuron-ethyl was studied on a soil surface under sunlight and UV light. Eight photoproducts were isolated and characterised by spectroscopic methods. Major photoproducts are formed by cleavage of the sulfonylurea bridge and minor products are formed via dechlorination, hydrolysis and cyclisation. The rates of photodegradation of chlorimuron-ethyl on di †erent soils followed Ðrst-order rate kinetics, with half lives of 22É3 h, 9É4 h, 4É9 h (UV) and 20É7 days, 11É1 days and 11É1 days (sunlight) for alluvial, red and laterite soils, respectively. The di †erences in rates of photodegradation were dependent upon the soil pH.