摘要
采用室内模拟酸雨淋溶土柱的方法,研究了酸雨作用下红壤中稀土元素La的释放特征.结果表明,酸雨加速了红壤中La的释放.在酸雨淋溶下La的释放一般表现出两阶段性特征:首先La释放量随淋溶量的增加而减小,然后随淋溶量的增加而增大.经过相当于9150～10650mm降水量的淋溶后,与对照(pH5.6)相比,pH4.5的酸雨使红壤La的累积释放量提高 5.11%～75.96%,pH3.5的酸雨使其提高16.64%～127.82%.除个别情况外,La释放量与Fe、Mn释放量呈显著或极显著性相关.初步推断多数红壤中的La主要吸附在Fe Mn氧化物表面或存在于Fe Mn氧化物中,其释放可能是由于吸附载体Fe Mn氧化物因H+的输入而解离所致.图4,表1,参8.
A soil leaching column experiment was designed to investigate the release of La from red soils under the influence by simulated acid rain. The results show that acid rain can accelerate the release of La from red soils.Under the influence by simulated acid rain,there is a stage characterister of La release from red soils changing with the leaching amount.At initial stage of leaching the La realse declines,and at last stage increases obviously.After 9 150～10 650 mm precipitation leaching,compared with pH5.6 precipitation,pH4.5 acid rain made the release of Cr increase-5.11%～75.96%,pH3.5 acid rain made it increase 16.64%～127.82%.In most cases,there was a remarkable correlation between the La reease and the Fe (or Mn) release.Probably because La is absorbed by Fe-Mn oxides,acid rain dissolves these oxides and simultaneously boosts the La release.4figs.,1tab.,8refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
2004年第4期88-91,共4页
Journal of Hunan University of Science And Technology：Natural Science Edition
关键词
酸雨
红壤
镧
释放特征
simulated acid rain
red soil
lanthanum
release
