Influência do meio reacional no comportamento fotoquímico do inseticida paration etílico

Abstract

Recebido em 1/3/01; aceito em 9/5/01 INFLUENCE OF REACTION MEAN IN THE BEHAVIOR PHOTOCHEMICAL OF INSECTICIDE ETHYL PARATHION. The photodegradation of parathion in natural and dezionised waters was studied under irradiation at two different wavelengths: 280 nm and 313 nm. The influence of humic acids was evaluated. The results demonstrated that the degradation occurred only due to photochemical processes. The chemical hydrolysis and biological processes can be neglected in this case. The addition of humic acids did not increase the photodegradation rate in either water samples (natural or dezionised). In alkaline solutions the photodegradation rate was higher in dezionised water when compared to natural waters. The kinetic degradation in all experiments obeyed a first order reaction pattern.

Presence of Organic Pesticides in Commercial Rainbow Trout Farms

“…Phosalone is toxic to fish and other aquatic organisms [40]. Reported that phosalone intoxication in common carp C. carpio can cause histopathological changes and among them in the gills (lamellar aneurysm, lamellar fusion and hyperplasia), liver (hypertrophy and nuclear degeneration) and kidney (hypertrophy, degeneration of tubules and dilation of the gromerular capillaries).…”

Avaliação eletroquímica e degradação fotoquímica do pesticida Malathion

“…Uma das diversas possibilidades de degradação consiste na aplicação de tecnologias capazes de oxidar espécies orgânicas, denominadas Processos Oxidativos Avançados (POAs, por brevidade). Esses processos baseiam-se na oxidação de compostos orgânicos por intermédio da formação de espécies altamente oxidantes como, por exemplo, o radial hidroxila (OH*) (NOGUEIRA;VILLA, 2005;SANTOS;REZENDE, 2002;SILVA et al 2008).…”