A. Itoh et H. Haraguchi, FORMATION OF LARGE MOLECULAR HUMIC-ACID WITH ADDITION OF ZINC ION AS ELUCIDATED BY LIQUID-CHROMATOGRAPHY ICP-AES, Chemistry Letters, (9), 1994, pp. 1627-1630
A size exclusion chromatography system with W absorption detection and
simultaneous multielement detection by ICP-AES has been used to eluci
date that humic acid forms some large molecules with molecular weight
larger than 300000 in aqueous solution, when zinc is added in humic ac
id solution as the ionic form.