Lability study of Cu(II), Cd(II), Mn(II) and Ni(II) complexed by aquatic humic substances using organomodified cellulose membranes

Química Nova

Universidade de São Paulo, São Carlos, Brasil¹  Goveia, Danielle¹  Dias Filho, Newton Luiz¹  Universidade Estadual Paulista, Ilha Solteira, Brasil¹  Rosa, André Henrique¹  Universidade Estadual Paulista, Sorocaba, Brasil¹  Rodrigues Filho, Ubirajara Pereira¹  Antunes, Maria Lúcia Pereira¹  Tonello, Paulo Sérgio¹  Bellin, Iramaia C.¹ 

关键词: water;    aquatic humic substances;    metal.;   

DOI  :  10.1590/S0100-40422007000100014

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this work commercial filters papers were organomodified with tetraethylorthosilicate (TEOS) and 3-aminopropyltriethoxysilane (3-APTS), aiming at the development of a new analytical procedure for in-situ speciation of labile and inert metal species in aquatic systems. Parameters that exert influence on the metal lability such as pH, chelating time, concentration and characteristics of the organic matter were studied in the laboratory using tests for metal recuperation. The results showed slower kinetics for Cu ion than for Ni, Mn and Cd in the absence of aquatic humic substances (AHS). The relative lability observed for complexed metals in aquatic humic substances using organomodified filter papers was Cu>>Cd>Ni>Mn. The pH values, structural characteristics and concentration of AHS exert strong influence on the lability of the metals. The results obtained showed that the utilization of organomodified filter papers can be an interesting and promising alternative for in situ characterization of metal lability in aquatic systems.

【 授权许可】

Unknown