Data/hora: 07/06/2024 02:52:53

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 21/07/1999
Data da última atualização: | 15/04/2019
Autoria: | AGBENIN, J. O.; ABREU, C. A. de; RAIJ, B. van.
Afiliação: | JOHN O. AGBENIN; CLEIDE A. DE ABREU, IAC/CAMPINAS; BERNARDO VAN RAIJ, CNPMA.
Título: | Extraction of phytoavailable trace metals from tropical soils by mixed ion exchange resin modified with inorganic and organic ligands.
Ano de publicação: | 1999
Fonte/Imprenta: | Science of the Total Environment, v.227, p.187-196, 1999.
Idioma: | Inglês
Conteúdo: | Chelating agents and organic acid ligands readily solubilize trace and heavy metals in soils. We compared Fe, Mn, Cu and Zn extracted from 16 soils by a mixed ion exchange resin (Amberlite IRA-120 + Amberlite IRA-400) modified with six simple inorganic and organic acid ligands with a conventional chelating agent (DTPA) and biossay. The mixed cation-anion exchange resins were saturated with Na-salts of chloride (R-CHL), bicarbonate (R-BIC), fluoride (R-FLU), acetate (R-ACT), citrate (R-CIT) and tartrate (R-TAR). Solubilization and adsorption of Fe and Cu from the soils By resin-ligand systems decreased in the order R-CIT >_ R-FLU >_ R-TAR = R-ACT > R-CHL = R-BIC reflecting differential stability of Fe- and Cu-organic/inorganic complexes. The R-CHL solubilized and adsorbed more Mn and Zn than other resin-ligand systems because of the relatively low pH maintained by the R-CHL-soil suspension. Extraction with DTPA gave similar amounts of Fe and Mn as resin-ligand systems, but DTPA extracted two to three times more Cu and Zn than resin. Resin-extractable Fe, Mn and Cu correlated with the corresponding DTPA-extractable metal contents, while both resin- and DTPA-extractable Cu correlated with the bioassay results. The R-ACT and R-TAR extractable Zn correlated more strongly with the biossay results than DTPA-extractable Zn. Mixed ion exchange resin is apparently feasible for characterizing plant available Fe, Mn, Cu and Zn in soils.
Palavras-Chave: | Bioassay; Chemical extraction; Effect; Resin extraction.
Thesaurus Nal: | agriculture; soil properties.
Categoria do assunto: | --
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (3671-1) - UPC - AP - DD -  -  -  - DIS