New analytical procedure based on a cellulose bag and ionic exchanger with p-aminobenzoic acid groups for differentiation of labile and inert metal species in aquatic systems |
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Authors: | André Henrique Rosa Danielle Goveia Iramaia C Bellin Suzan da Silva Lessa Newton L Dias Filho Pedro de Magalhães Padilha |
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Institution: | (1) Group of Environmental Studies, Universidade Estadual Paulista (UNESP), 18087-180 Sorocaba, SP, Brazil;(2) Institute of Chemistry, Universidade Estadual Paulista (UNESP), 14800-900 Araraquara, SP, Brazil;(3) Department of Physics and Chemistry, Universidade Estadual Paulista (UNESP), 15385-000 Ilha Solteira, SP, Brazil;(4) Department of Chemistry and Biochemistry, Universidade Estadual Paulista (UNESP), 18618-000 Botucatu, SP, Brazil |
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Abstract: | A new procedure was developed for the in situ characterization of the lability of metal species in aquatic systems by using
a system equipped with a diffusion membrane and cellulose organomodified with p-aminobenzoic acid groups (DM-Cell-PAB). To this end, the DM-Cell-PAB system was prepared by adding cellulose organomodified
with p-aminobenzoic acid groups (Cell-PAB) to pre-purified cellulose bags. After the DM-Cell-PAB system was sealed, it was examined
in the laboratory to evaluate the influence of complexation time, mass of exchanger, pH, metal ions (Cu, Cd, Fe, Mn, and Ni),
and concentration of organic matter on the relative lability of metal species. It was found that the pH and kinetics strongly
influence the process of metal complexation by the DM-Cell-PAB system. At all pH levels, Cd, Mn, and Ni showed lower complexation
with Cell-PAB resin than Cu and Fe metals. Note that relative lability of metals complexed to aquatic humic substances (AHS)
in the presence of Cell-PAB resin showed the following order: Cu≅Fe≫Ni>Mn=Cd. The results presented here also indicate that
increasing the AHS concentration decreases the lability of metal species by shifting the equilibrium to AHS–metal complexes.
Our results indicate that the system under study offers an interesting alternative that can be applied to in situ experiments
for differentiation of labile and inert metal species in aquatic systems. |
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Keywords: | Aquatic humic substances Metal species Lability Cellulose modified with p-aminobenzoic acid groups |
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