Acidic Properties of Dissolved Organic Matter Leached from Organic Layers in Temperate Forests
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概要
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The production of organic acids in forest organic layers is one of the major acid producing processes. In the organic layer leachates collected in Central Japan, the negative charge deficit between cations and inorganic anions ranged from 10 to 92% of the total positive charge of cations. The anion deficit was well correlated with the concentration of dissolved organic carbon (DOC). Carboxyl group contents in DOC and their pK_a values were statistically optimized so that the anion deficit could be evaluated by the measurement of the DOC concentration and pH value. Optimized values for carboxylic group contents were in the range of 4.9 to 5.9 μmol_c mg^<-1> C, which were lower than the amounts determined by titration, with the average values ranging from 5.7 to 7.8 μmol_c mg^<-1> C. The optimized values were rather close to those with pK_a less than 3.2 determined by the titration. The dissolved organic matter was fractionated into four groups according to hydrophobicity and acid-base properties. Hydrophobic acid fraction was the largest and accounted for 52 to 71% of the whole DOM. It contained about 10 μmol_c mg^<-1> C of carboxylic groups, and 68±9% of them showed a pK_a value of less than 3.2. Such a low pK_a value of carboxylic groups is considered to have been caused by paired carboxylic groups with much higher pK_a values, and hydroxyl groups. Hence the carboxylic groups were considered to exhibit a large range of pK_a values. The carboxylic groups which were actually dissociated in the analyzed leachates were considered to be those with low PK_a values. The estimation assuming a single pK_a value did not give reliable results, and was biased in that it reflected the properties of the low pK_a carboxylic groups. The proportion of the hydrophilic acid fraction was lower than that reported by other authors in cooler regions. The amounts of the carboxylic groups in the hydrophilic acids ranged from 16 to 22 μmol_c mg^<-1> C, values about two times as high as those of hydrophobic acids.
- 社団法人日本土壌肥料学会の論文
著者
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Yonebayashi Koyo
Faculty of Agriculture, Kyoto Prefectural Unirersity
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Yonebayashi Koyo
Faculty Of Agriculture Kyoto Prefectural University
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Nambu Kei
Faculty of Agriculture, Kyoto University
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Nambu Kei
Faculty Of Agriculture Kyoto Prefectural University
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