Copper(II) and Nickel (II) Complexation Capacity of Dissolved Organic Matter from Rivers of Agricultural and Urban Areas in the State of Sao Paulo

Autor:	Altair Benedito Moreira, Amanda Maria Tadini, Mariele B. Campanha, Márcia Cristina Bisinoti
Přispěvatelé:	Universidade Estadual Paulista (Unesp)
Jazyk:	angličtina
Rok vydání:	2013
Předmět:	chemistry.chemical_classification Chemistry Ultrafiltration chemistry.chemical_element Spectrofluorometer Aromaticity General Chemistry dissolved organic matter stability constant Copper Nickel Stability constants of complexes Metals Environmental chemistry Dissolved organic carbon Organic matter
Zdroj:	Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Journal of the Brazilian Chemical Society, Volume: 24, Issue: 11, Pages: 1789-1797, Published: NOV 2013 Journal of the Brazilian Chemical Society v.24 n.11 2013 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ
Popis:	This study had as main objective to determine the complexing ability of the Organic Matter (OM) from typical agricultural areas and from urban areas with copper and nickel ions. The samples were collected during the dry and rainy seasons and were subjected to study the complexing capacity and OM conditional stability constant with Cu(II) and Ni(II) ions using a luminescence spectrofluorometer and tangential flow ultrafiltration system. The conditional stability constant values (log Kc) of OM with the copper ion varied from 0.04 to 1.35 with the highest value obtained for the place with the largest dissolved organic carbon (DOC 2.73-2.43 mg L-1) and the lowest for the smallest site DOC, corroborating the degree of aromaticity. We can conclude that the Dissolved Organic Matter (DOM) of the bodies of water in agricultural and urban areas contained a lower number of binding sites when compared with other locations. Este estudo teve como principal objetivo determinar a capacidade de complexação da Matéria Orgânica (MO) de regiões tipicamente agrícolas e urbanas, com os íons de cobre e níquel. As amostras foram coletadas durante as estações de seca e chuva e submetidas ao estudo da capacidade de complexação e da constante de estabilidade condicional da MO com os íons Cu(II) e Ni(II) usando um Espectrofluorímetro de Luminescência e o Sistema de Ultrafiltração de Fluxo Tangencial. Os valores da constante de estabilidade condicional (log Kc) da MO com o íon cobre variaram de 0,04 a 1,35 sendo o maior valor obtido para o local com maior carbono orgânico dissolvido (COD 2,73-2,43 mg L-1) e o menor para local de menor COD, corroborando com o grau de aromaticidade. Conclui que a Matéria Orgânica Dissolvida (MOD) de rios de áreas agrícolas e urbanas continha um número menor de sítios de ligação, quando comparado com outros locais.
Databáze:	OpenAIRE
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