Single-pass flow-through experiments on a simulated waste glass in alkaline media at 40 degrees C. II. Experiments conducted with buffer solutions containing controlled quantities of Si and Al

Additional single-pass how-through (SPFT) experiments have been conducted w ith a complex, simulated waste glass at 40 degrees C in moderately alkaline media. Results are compared to those obtained in the experiments described in Part I, and with published data obtained in long-term, static, batch di ssolution experiments with this glass formulation. Dissolution rate laws fo r the glass must account for the rate influencing effects of both dissolved Si and Al species. These experiments have shown that on a mole per mole ba sis, dissolved Al has a more significant influence on the glass dissolution rate than dissolved Si under these experimental conditions. The very low ' long-term' dissolution rates reported in static batch dissolution experimen ts reflect near saturation conditions that are not attained in SPFT tests a s a result of solution flow-through. (C) 2000 Elsevier Science B.V. All rig hts reserved.