Organochlorine pesticides and polychlorinated biphenyls in soil and water samples in the northeastern part of São Paulo State, Brazil

Detailed analyses of persistent organic pollutants (POPs) such as organochlorine pesticides (OCPs), hexachlorocyclohexane (HCH) isomers (HCHs), dichlorodiphenyltrichloro ethane (DDT) and its metabolites (DDTs) and congeners of polychlorinated biphenyls (PCBs) in soil and surface water from the northeastern São Paulo, Brazil allowed the evaluation of the contamination status, distribution and possible pollution sources. The pesticides and PCBs demonstrated markedly different distributions, reflecting different agricultural, domestic and industrial usage in each region studied. The ranges of HCH, DDT, and PCBs concentrations in the soil samples were 0.05-0.92, 0.12-11.01, 0.02-0.25 ng g(-1) dry wt, respectively, and in the surface water samples were 0.02-0.6, 0.02-0.58 and 0.02-0.5 ng l(-1), respectively. Overall elevated levels of DDT and PCB were recorded in region 2, a site very close to melting, automotive batteries industries, and agricultural practice regions. High ratios of metabolites of DDT to DDT isomers revealed the recent use of DDT in this environment. The sources of contamination are closely related to human activities, such as domestic and industrial discharge, street runoff, agricultural pesticides and soil erosion, due to deforestation as well as atmospheric transport. (c) 2006 Elsevier Ltd. All rights reserved.

Non-contact specular microscopy in aphakic and pseudophakic dogs

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Ocorrência de poluentes orgânicos persistentes em ovos de Caiman yacare (jacaré-do-Pantanal)

Pós-graduação em Química - IQ

Otimização de um método cromatográfico de análise de pesticidas organoclorados em amostras de peixes

Considering that persistent organic pollutants (POPs) including synthetic substances belonging to differents organic functions, including organochlorine pesticides (OCPs), which are the most persistent and bioaccumulative, with high toxicity to humans and animals. Accordingly environmental and biological monitoring is necessary, in order to have greater control regarding the irresponsible use of these products. Though there are several analytical methodology reported in the literature to make determinations of this pesticide, they present some difficulties, requiring several steps to make the clean up of the sample. The proposed project aims to optimize a new analytical method that allows to perform the extraction of organochlorine pesticides in fish tissues, employing acetone as solvent assisted by ultrasound bath, making the method more quickly and not requiringfurther steps to purify the sample. Were analyzed the recoveries of pesticides in study in samples of tilapia average values: Heptachlor=84,7±9,8%; Aldrin=87,3±3,5%; Endosulfan=101,4±18,6%; DDE= 90,5± 3,3%, Endrin=102,2±13,8%., DDD=92,1±19,9%; DDT=90,8±6,8%. The real samples showed values granted for our legislation and low values of error

Ocorrência de opacidade de cápsula posterior em cães pós-facoemulsificação, com ou sem a utilização de lente intraocular dobrável e efeitos do Nd: Yag Laser

Pós-graduação em Cirurgia Veterinária - FCAV