生态环境学报Issue(5)：851-856,6.
重金属在燃煤烟气脱硫石膏改良盐碱土壤中迁移的实验研究
Experimental investigation on distribution profiles of heavy metals in the desulfurization gypsum amended saline and sodic soils
摘要
Abstract
Flue gas desulfurization (FGD) gypsum has been applied as an amendment to saline and sodic soils for nearly two decades. It has been proven that FGD gypsum is effective for reclaiming sodic soils. However, as a byproduct from wet desulfurization process, FGD gypsum thus contains some heavy metals either from coal or from limestone. The heavy metals that have entered the soils amended with FGD gypsum may be leached to the soil environment. To date, very few data are available to show the potential environmental risks of the heavy metals introduced by FGD gypsum on the soils. The migration of these extra heavy metals in the soils remains unclear. In this paper, soil column leaching experiments were carried out to investigate the distribution profiles of heavy metals, such as Pb, Cd, Cr, As and Hg, in different soil horizons. The results showed that the pH value, total dissolved salts (TDS) and exchangeable sodium percentage (ESP) significantly decreased in the FGD gypsum amended soils compared with those in the unamended soil. No significant accumulation of heavy metals was found in the soils with the introduction of FGD gypsum. However, Cd and Hg contents increased slightly in 60-80 cm and 40-60 cm horizons respectively, while Pb content in each horizon were significantly lower than those in the top surface horizon. Moreover, the contents of the heavy metals in the soils were well complied with the Environmental Quality Standard for Soils in China (GB 15618—1995), which implied that FGD gypsum would not deteriorate the soil environmental quality.关键词
土柱试验/重金属/脱硫石膏/盐碱土壤Key words
soil-column experiment/heavy metals/FGD gypsum/sodic soils分类
农业科技引用本文复制引用
王淑娟,陈群,李彦,张宁,赵博,禚玉群,陈昌和..重金属在燃煤烟气脱硫石膏改良盐碱土壤中迁移的实验研究[J].生态环境学报,2013,(5):851-856,6.基金项目
国家科技支撑计划（2013BAC02B06）；清华大学自主科研计划 （）
