Chemical stability of simulated waste forms Zr1–xNdxSiO4–x/2: Influence of temperature, pH and their combined effects
来源期刊：Journal of Rare Earths2017年第7期
论文作者：王兰 卢喜瑞 舒小艳 丁艺 易发成 马登生 任卫 吴彦霖
文章页码：709 - 715
摘 要：The chemical stability of simulated waste forms Zr1–xNdxSiO4–x/2 was investigated using the static leach test（MCC-1） with lixiviants of three pH values（pH=4, 6.7 and 10） at three temperature points（40, 90 and 150 oC） for periods ranging from 1 to 42 d, and the influence of temperature, pH, as well as their combined effects were explored in detail. The results showed that all the normalized release rate of Nd firstly decreased with leaching time and closed to equilibrium after 14 d. As the temperature increased, the normalized release rate of Nd also increased, but it was no more than 3×10–5 g/（m2·d）. And, the normalized release rate of Nd reached the highest values(5×10–5 g/（m2·d）) when pH=4, whilst the normalized release rate of Nd remained the lowest value(1×10–5 g/（m2·d）) near neutral environment（pH=6.7）.
王兰1，卢喜瑞1，舒小艳1，丁艺1，易发成1，马登生1，任卫2，吴彦霖4
1. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology2. Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences4. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
摘 要：The chemical stability of simulated waste forms Zr1–xNdxSiO4–x/2 was investigated using the static leach test（MCC-1） with lixiviants of three pH values（pH=4, 6.7 and 10） at three temperature points（40, 90 and 150 oC） for periods ranging from 1 to 42 d, and the influence of temperature, pH, as well as their combined effects were explored in detail. The results showed that all the normalized release rate of Nd firstly decreased with leaching time and closed to equilibrium after 14 d. As the temperature increased, the normalized release rate of Nd also increased, but it was no more than 3×10–5 g/（m2·d）. And, the normalized release rate of Nd reached the highest values(5×10–5 g/（m2·d）) when pH=4, whilst the normalized release rate of Nd remained the lowest value(1×10–5 g/（m2·d）) near neutral environment（pH=6.7）.
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