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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


CANELLAS, Luciano Pasqualoto et al. Increase resolution of solution 13C NMR spectra of humic acids by previous treatment with 0,03 mol L-1 KCl. Quím. Nova [online]. 2001, vol.24, n.1, pp.131-132. ISSN 0100-4042.

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.

Keywords : humic acids; humic substances; 13C NMR.

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