Aumento da resolução de espectros de RMN 13C de ãcidos húmicos em solução através do tratamento prévio com KCl 0,03 mol L-1

Abstract

High levels of Fe and Mn present in some soils and compost organic matter decrease the resolution of 13C NMR spectra of humic substances. Addition of KCl up to a concentration of 0,03 mol L-1 to humic substances extracts followed by centrifugation is an efficient method of eliminating clays and minerals containing high levels of paramagnetic metals such as Fe and Mn thus increasing the resolution of 13C NMR spectra.