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Hokkaido University Collection of Scholarly and Academic Papers >
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吸着等温線によるアロフェン質火山灰土への硫酸イオン吸着機構の考察
| Title: | 吸着等温線によるアロフェン質火山灰土への硫酸イオン吸着機構の考察 |
| Other Titles: | Adsorption Isotherm of Sulfate on an Allophanic Andisol |
| Authors: | 石黒, 宗秀1 Browse this author →KAKEN DB | | 服部, 保誠2 Browse this author | | 牧野, 知之3 Browse this author | | 赤江, 剛夫4 Browse this author |
| Authors(alt): | ISHIGURO, Munehide1 | | HATTORI, Yasunobu2 | | MAKINO, Tomoyuki3 | | AKAE, Takeo4 |
| Keywords: | アロフェン質火山灰土 | | pH | | 硫酸イオン | | 吸着等温線 | | 吸着 | | ラングミュア式 | | 沈殿 | | Allophanic Andisol | | pH | | SO4 | | Adsorption isotherm | | Adsorption | | Langmuir equation | | Precipitation |
| Issue Date: | Apr-2004 |
| Publisher: | 農業農村工学会 |
| Journal Title: | 農業土木学会論文集 |
| Journal Title(alt): | Transactions of The Japanese Society of Irrigation, Drainage and Reclamation Engineering |
| Volume: | 230 |
| Start Page: | 69(187) |
| End Page: | 74(192) |
| Publisher DOI: | 10.11408/jsidre1965.2004.187 |
| Abstract: | 硫酸イオンは, アロフェン質火山灰土に吸着して, 土壌を安定な凝集構造にし, また, 硝酸イオンの移動を促進することが知られている.しかし, その吸着機構は十分明らかになっていない.本研究では, バッチ法により, pH4, 5, 6, 7におけるアロフェン質火山灰土への硫酸イオン吸着量を測定し, その吸着等温線から硫酸イオンの吸着機構を考察した.どのpHにおいても, 横軸を濃度の対数目盛に取った吸着等温線は, 平衡溶液濃度0.5mmolc・l-1の周辺で階段状となり, 異なる吸着エネルギを持つ吸着サイトの存在が示唆された.低pHになるほど吸着エネルギの大きな吸着サイトの割合が大きくなると考えられた.平衡溶液濃度が50mmolc・l-1程度以上で, pHによる差がほとんどなくなり, 濃度上昇に伴い吸着量も増加し続けることを明らかにした.水溶液中での沈殿形成濃度より明らかに低濃度において, 沈殿が土粒子表面で形成されることが示唆された. | | Amounts of SO42- adsorption on an Allophanic Andisol at pH4, 5, 6, 7 were measured with batch method. Adsorption mechanisms were considered with the adsorption isotherms with the axis of a logarithm of concentration. Under equilibrium concentration of 50 mmolc·l-1, the isotherms fit two step Langmuir equation. Inner-sphere surface complexation was supposed to be formed at lower concentration and electrostatic adsorption was expected at higher concentration. Adsorption amount with inner-sphere complexation became larger as solution pH decreased. Over equilibrium concentration of 50 mmolc·l-1, no difference among isotherms of different pH was observed and the steep increase of adsorption amount with concentration was derived. Surface induced precipitation of Na2SO4 was supposed to occur over that concentration. |
| Rights: | © 社団法人 農業農村工学会 | | © The Japanese Society of Irrigation, Drainage and Rural Engineering |
| Type: | article |
| URI: | http://hdl.handle.net/2115/70742 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 石黒 宗秀
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