A determinação de metais traço é um indicador importante da toxicidade dessas espécies no ambiente marinho. As técnicas de redissolução são freqüentemente utilizadas, devido a sua sensibilidade e seletividade. Nesta investigação foram determinados parâmetros eletroquímicos para a detecção da concentração dos íons de metais chumbo, zinco e cobre, em águas costeiras, empregando as técnicas de voltametria de redissolução anódica de pulso diferencial (DPASV) e voltametria de redissolução catódica adsortiva de pulso diferencial (DPACSV). Para a determinação do limite de detecção dos íons de metais foram utilizadas amostras sintéticas, em pH 2 para chumbo e zinco e em pH 9 para cobre. Na etapa de validação das metodologias realizada em amostra de água de mar costeira certificada (CASS-4) encontrou-se a concentração de 10,3 nmol L -1 para o íon Cu(II). Utilizou-se o procedimento de enriquecimento e recuperação para os metais analisados sendo obtidos os seguintes percentuais de recuperação:). Os valores de concentrações de metal total foram considerados baixos, quando comparados aos índices estabelecidos pelo CONAMA, principalmente para chumbo e zinco. Para o íon cobre a maior concentração pode ser atribuída ao uso de tintas antiincrustantes e de processos industriais.The determination of trace metal concentrations is an important indicator of toxicity toward species present in ocean environments. Stripping techniques are frequently used, due to their sensitivity and selectivity. In this investigation we were able to determine, efficiently, the concentration of lead(II), zinc(II) and copper(II), in coastal waters, using Differential Pulse Anodic Stripping Voltammetry (DPASV) and Differential Pulse Adsorptive Cathodic Stripping Voltammetry (DPACSV) techniques. For the determination of metal ion detection limits, synthetic samples were used, pH 2 for lead and zinc and pH 9 for copper. In order to check the accuracy of the procedure a certified coastal marine sample (CASS-4) was used and a concentration of 10.3 nmol L -1 for Cu(II) was obtained. The enrichment and recovery method was used for the metals analyzed, the following percent recoveries being obtained: 95±10 (Pb ). The total metal concentrations obtained were considered low, when compared with the indices established by CONAMA, particularly for lead and zinc. For the copper ion the higher concentration may be attributed to its use in the anti-fouling paint, and industrial processes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.