Interaction of radium with freshwater sediments and their mineral components
Interaction of radium with freshwater sediments and their mineral components
复制标题
镭与淡水沉积物及其矿物成分的相互作用
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
P. Strejc
中科院分区：
文献类型：
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作者：
P. Benes;Z. Borovec;P. Strejc
用放射性示踪法研究了在与废水和地表水中普遍存在的条件类似的条件下，痕量镭在白云母和长石(钠长石)上的吸附和解吸。研究了pH、液固比、时间、离子强度(Na+)以及Ca~(2+)或SO_4~(2+)−离子的存在对反应的影响。已经得出的结论是，如果这两种矿物作为海底沉积物的主要成分存在，或以每升几毫克或更高浓度的悬浮固体存在，这两种矿物都会对地表水中镭的去向和迁移产生重大影响。即使是从中等酸性的水中，白云母也能吸收镭。随着环境水盐度的增加，吸附在白云母和钠长石上的镭不易释放。然而，1M的HCl可以实现几乎完全的解吸。讨论了镭在两种矿物上的吸附机理和吸附部位的特征。
Radiotracer method has been used for investigation of the adsorption and desorption of traces of radium on muscovite and feldspar (albite) under conditions similar to those prevailing in waste and surface waters. The effects of pH, liquid to solid ratio, time, ionic strength (Na+) and presence of Ca2+ or SO42− ions have been studied. It has been concluded that both minerals can significantly affect the fate and migration of radium in surface waters if present as major components of bottom sediments or as suspended solids in concentrations of several milligrams per liter or higher. Muscovite can absorb radium even from moderately acidic waters. Radium adsorbed on muscovite and albite cannot be easily released upon an increase of the salinity of ambient water. However, almost complete desorption can be achieved with 1M HCl. Mechanisms of radium adsorption on both minerals and character of the adsorption sites are discussed.