Estudo da capacidade de complexação e sua relação com algumas variáveis ambientais em cinco represas do Rio Tietê/Brasil Study of complexation capacity and its relationship with some environmental variables in five reservoirs of the Tietê River system
| Autor: | Elisangela C. L. Borges, Antonio Aparecido Mozeto, Eduardo F. Almeida Neves, Waldomiro Borges Neto, José Mauro Bezerra |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 30, Iss 7, Pp 1505-1511 (2007) |
| Druh dokumentu: | article |
| ISSN: | 0100-4042 1678-7064 |
| DOI: | 10.1590/S0100-40422007000700002 |
| Popis: | The copper and cadmium complexation properties in natural sediment suspensions of reservoirs of the Tietê River were studied using the solid membrane copper and cadmium ion-selective electrodes. The complexation and the average conditional stability constants were determined under equilibrium conditions at pH=6.00 ± 0.05 in a medium of 1.0 mol L-1 sodium nitrate, using the Scatchard method. The copper and cadmium electrodes presented Nernstian behavior from 1x10-6 to 1x10-3 mol L-1 of total metal concentration. Scatchard graphs suggest two classes of binding sites for both metals. A multivariate study was done to correlate the reservoirs and the variables: complexation properties, size, total organic carbon, volatile acid sulfide, E II and pH. |
| Databáze: | Directory of Open Access Journals |
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