摘要
提出并讨论了土壤的潜在还原容量、有效还原容量和条件还原容量等概念；通过对采自北京和唐山地下水饮用水源区３个包气带土壤样品的土柱淋滤实验，研究了土壤对水溶液中六价铬（Ｃｒ（ＶＩ））的还原作用，研究了上述土壤各种还原容量之间的关系及影响因素；探讨了向土壤中投加适量常见、无毒、价廉的还原性物质（如厩肥、ＦｅＳ和风化煤等）以提高土壤还原能力的方法和将其应用于去除灌溉用污染地下水中六价铬（Ｃｒ（ＶＩ））的可能性．实验结果表明，在正常环境条件下，土壤的有效还原容量比土壤的潜在还原容量低３个数量级左右．向土壤中投加适量还原性物质可以大大提高土壤的有效还原容量．与ＦｅＳ和风化煤相比，厩肥还原效果最好，具有更持续的还原能力．
The concept of soil reduction capacity and its potential application to remediating of Cr contaminated soil and groundwater were discussed.Three types of reduction capacity of soil,i.e.,the potential reduction capacity,available reduction capacity,and conditional reduction capacity were suggested.Three soil samples were collected from a groundwater pumping area and a Cr contaminated groundwater area in Tangshan City in north China.Soil column leaching experiments were conducted to evaluate the relations between the carious reduction capacity for Cr(Ⅵ) of soils.Approaches to increase the available reduction capacity of the soil by adding selected reductive materials,such as cattle manure,FeS and weathered coal were investigated.Results showed that the available reduction capacity of soil was about three orders of magnitude lower than the corresponding potential reduction capacity.Adding of selected reductive materials to soil could increase the available reduction capacity of soil. Compared with FeS and weathered coal, the cattle manure proved to be a better reductive material apparently with a prolonged reduction potential.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1997年第3期334-339,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金
国家"八五"科技攻关项目
关键词
铬
土壤
还原容量
地下水
污染治理
chromium, reduction capacity, remediation, groundwater, soil.
