Vapor-phase photodecomposition of aldrin and dieldrin

Abstract

A special reactor was constructed to study the vapor-phase photodecomposition of pesticides by ultraviolet (UV) light. The reactor was designed in such a way that wall reactions would be minimized and could be distinguished from actual vaporphase transformations. The vapor-phase photodecomposition of the insecticides aldrin and dieldrin were studied with this reactor. Irradiation of aldrin vapor with UV light resulted in the formation of photoaldrin and dieldrin. Irradiation of either photoaldrin or dieldrin vapor resulted in a single photoproduct, photodieldrin, which was resistant to further photolysis. Hence, irradiation of aldrin vapor ultimately produced photodieldrin by way of two separate pathways: a photoisomerization followed by photooxidation and a photooxidation followed by photoisomerization.

The relationship between land use and organochlorine compounds in streambed sediment and fish in the Central Columbia Plateau, Washington and Idaho, USA

“…For example, the insecticide aldrin was widely used before its ban in 1974. However, it is rarely detected in monitoring studies because in the environment it breaks down rapidly to dieldrin, which is considerably more resistant to further degradation [33]. In our study, aldrin was detected at only one site, whereas dieldrin was detected at 21% of the sites in sediment and at 50% of the sites in fish.…”

Occurrence and source identification of organochlorine pesticides in the surrounding surface soils of the Ittehad Chemical Industries Kalashah Kaku, Pakistan

“…Detection of dieldrin and absence of aldrin in soil samples indicated old use of eldrin. Degradation of aldrin residues to dieldrin is rapid in soils (Crosby and Moilanen 1974). Heptachlor is another chlorinated cyclodiene that is extensively used as insecticide in agriculture before its ban.…”

Studies on Photochemical Reactions of Air Pollutants. XV. Photoreactivity of Heptachloro-3'-cyclopentenyldioxy Heptachloro-2-cyclopentene Formed by Exposure of Hexachlorocyclopentadiene to Ultraviolet Light in Air

“…Anal. Calcd for C 10 (1) in Air One milliliter of a n-hexane solution of 3 (22.3 mmol/mlϭ500 ml gas/ml) was taken into a 180 ml Pyrex reaction vessel. n-Hexane vapor was flushed out with air (ca.…”

“…[1][2][3][4][5][6] Many researchers have examined its transformations on exposure to sunlight in air, 7) to sunlight in the presence of photosensitizer in air 8,9) or to UV at wavelengths longer than 290 nm in a vapor-phase system in air, 10) as well as in the presence of nitrogen dioxide in air, 11) in the presence of a-diketones including glyoxal, methylglyoxal and biacetyl in air, 12) in the presence of suspended particulates in air 13) and in the presence of benzaldehyde in air. 14) Interestingly, it was observed that crude 3 gave 4 in moderately yield when exposed to light at wavelengths longer than 290 nm.…”