RESUMO
Ethylenediamine tetraacetic acid (EDTA) is a potent chelating agent and has the potential to affect the environmental mobility of heavy metals. A reliable quantification of EDTA and its speciation is required in order to accurately estimate the actual impact of this compound on the aquatic environment. This study aimed to determine the optimal conservation conditions for samples in order to accurately measure EDTA speciation and total EDTA concentration. The results obtained by studying the effects of time elapsed between sampling, conditioning [i.e., addition of reagents to complex EDTA with Fe (III)], and analysis show that the determination of EDTA speciation needs to be carried out immediately after sampling. The measurement of total EDTA may be performed within 2 mo, as long as the sample is filtered and conditioned on the day of sampling.
Assuntos
Quelantes/análise , Técnicas de Química Analítica/métodos , Ácido Edético/análise , Poluentes Químicos da Água/análise , Biodegradação Ambiental , Cromatografia Líquida de Alta Pressão/métodos , Ferro/análise , Gerenciamento de ResíduosRESUMO
The Geneva rule was the first one in Switzerland to introduce the concept of Strategic Environmental Assessment (SEA). This assessment constitutes a decision making aid which describes the process set up to allow evaluation of potential environmental impact and comparison of possible variants, recommends the choice for the best option and suggests the precautions to take. It presents much resemblances to HIA. In this case therefore the application of SEA in the urban planning project MICA has been presented. It is in this framework that a first experience of integration HIA to the SEA process was realized. In an additional way to SEA, HIA is focused on the following fields of potential impact: transport and movements, housing, public facilities, water management.
