RESUMO
In the last years, the occurrence of pesticides and other chemicals in groundwater has been confirmed. The herbicide atrazine is among the pesticides most frequently detected in groundwater. In groundwater samples from the United States atrazine concentrations reached levels up to 10 micrograms/1. In our lysimeter experiments with radioactive labelled terbuthylazine we measured 2.87-4.20% of the applied radioactivity after 1160 days in the leachate.
Assuntos
Herbicidas/análise , Triazinas , Poluentes Químicos da Água/análise , Abastecimento de Água/análise , Fenômenos Químicos , Físico-Química , Alemanha , Herbicidas/química , Solo/análise , Poluentes do Solo/análiseRESUMO
The inhabitants living in the neighbourhood of a deserted mercury-contaminated industrial site are subjected to an age-group differentiated mercury exposure assessment based on a scenario-linked calculation. Analytical input data for the calculation procedure are provided for from soil, air and plants in a large number. The most sensitive group are small children being mainly exposed by soil ingestion which makes up nearly 80% of the ADI, followed by inhalation of mercury contaminated indoor air. On the other hand, inhalation of indoor air has a predominant impact on youth and adults.
Assuntos
Poluição do Ar em Ambientes Fechados/análise , Exposição Ambiental , Intoxicação por Mercúrio/etiologia , Mercúrio/análise , Poluentes do Solo/análise , Adolescente , Adulto , Idoso , Criança , Pré-Escolar , Estudos de Coortes , Feminino , Contaminação de Alimentos , Humanos , Lactente , Recém-Nascido , Masculino , Mercúrio/metabolismo , Pessoa de Meia-Idade , Plantas/química , Medição de Risco , Espectrofotometria Atômica , Poluentes Químicos da Água/análiseRESUMO
The photolysis of selected pesticides in aqueous solutions has been investigated. The photolysis produced different intermediate substances, which were also found to be soil and microbial degradation products. The phototransformation in the presence of TiO2 and humic substances leads to a disappearance of these compounds. The reaction rate is dependent on the semiconductor oxide and concentration. Photoproducts were isolated and characterized by different spectroscopic methods. Results from this study indicate that degradation products of isoproturon are more toxic on Daphnia magna than on the parent compound.