DETERMINATION OF MOLECULAR WEIGHTS OF HUMIC ACIDS BY OSMOTIC PRESSURE MEASUREMENT AND BY PERMEATION CHROMATOGRAPHY ON CONTROLLED PORE GLASS
スポンサーリンク
概要
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Number-average molecular weights (M^^-_n) of humic acids (HAs) were determined by osmometry and by permeation chromatography on controlled pore glass with a pore size of 500Å. M^^-_n value of dialyzed HAs tended to decrease in the order of Rp(2) > Rp(1) > P_0 type. and increase in the order of P_0 > B > A type. M^^-_n value of non-dialyzed HAs did not show any remarkable difference among the HA types, which was considered to be due to the predominance in the number of species with lower molecular weight (< 10,000) in HAs. M^^-_n value calculated from the permeation chromatiograms showed a similar trend to that of M^^-_n while the differential refractive index gave a larger value for M^^-_n than that by osmometry. It was shown that both the decrease and increase in the molecular weight take place during the humification process of HAs, where the decrease was considered to be associated with the decomposition of partially decayed bio-polymers and the increase with the formation of a dark colored high polymer intrinsic to soils.
- 社団法人日本土壌肥料学会の論文
著者
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Tsutsuki Kiyoshi
Faculty Of Agriculture Nagoya University
関連論文
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