湖沼堆積物中のフルボ酸の持つカルシウム錯化能力

概要

論文の詳細を見る
It has been assumed that the metal complexing abilities of fulvic acids, which are one of the humic substances, play an important role for phosphorus releasing from sediments under aerobic condition in shallow lakes and internal bay. However, little information is available on the nature, properties, and structures of fulvic acids which can promote the phosphorus releasing from calcium phosphates in the sediments. In this study, fulvic acids extracted from 3 lake sediments were divided into hydrophilic and hydrophobic fractions with Amberlite XAD-2 resin, and then these fractions were subjected to a molecular weight fractionation by Sephadex G-15 gel. The calcium complexing abilities of the fractions obtained were examined by the reaction chromatography using a Ca-saturated gel column. Both hydrophilic and hydrophobic fractions displayed the calcium complexing abilities at the low molecular weight fractions (less than 1,500 D). The abilities of the former fractions were 2.5 times higher than those of the latter fractions at a maximum level.
日本地球化学会の論文
2006-12-26