塩溶液中の溶解性シリカの平衡濃度と重合速度について
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概要
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The solubility of amorphous silica was determined in sodium chloride,potassium chloride, magnesium chloride and calium chloride solutions from 0.01 to 1moI/I and at temperatures of 21,36,50 and 65℃. The Setchenow equation was applied to the results, which enabled us to estimate the equilibrium concentration of "dissoloved silica" (molybdate-reactive silica) in the studied chloride solutions. Next, the effects of pH, supersaturation of silica and salt concentration on the polymerization rate of silica were investigated at 35℃. In the pH range from 6.4 to 7.9, the maximum polymerization rate increased with increasing pH. The maxima occurred when dissoloved silica decreased by 25% of the initial supersaturation concentrations irrespective of pH. The polymerization rate was found to be dependent on the supersaturation degree rather than on the supersaturation concentration of silica. The results in magnesium chloride solutions suggest that magnesium ions may act as nuclei in the formation of colloidal silica in geothermal waters.
- 1995-09-20
論文 | ランダム
- 大気分野の環境計測
- 電子雲の動的過程と分子構造・化学反応
- 山形大学工学部・機能高分子工学科・折原研究室
- 日本の大学・試験・研究機関の研究(141)山形大学工学部 機能高分子工学科 折原研究室
- 体力診断にもとづいた運動処方とその効果--神奈川県立体育センタ-の場合 (運動処方--最近の動向)