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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (2): 278-281.doi: 10.11924/j.issn.1000-6850.2011-1704

所属专题： 土壤重金属污染

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

柠檬酸对铬污染不同质地土壤萃取与淋洗的研究

姜晓琪 李旭霖 张娇 吕姜宁 昌晶 崔德杰   

  • 收稿日期:2011-06-08 修回日期:2011-10-21 出版日期:2012-01-15 发布日期:2012-01-15
  • 基金资助:

    青岛市公共领域科技支撑计划项目

Study of Citric Acid on Extraction and Washing from Different Soil Polluted by Cr

  • Received:2011-06-08 Revised:2011-10-21 Online:2012-01-15 Published:2012-01-15

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摘要：

为了探索柠檬酸对不同质地铬（Cr）污染土壤的萃取条件及淋洗效率，进行了不同浓度、固液比、时间的萃取和土柱淋洗试验。结果表明：柠檬酸对铬污染不同质地土壤修复效果为：砂土＞壤土＞粘土；砂土、壤土所需萃取条件较小，粘土较大。不同萃取条件对铬污染土壤萃取效果影响较大：柠檬酸浓度为0.05 mol/L时，3种土壤萃取效果较好。3种质地土壤最佳固液比和时间分别为：粘土1/14，32 h；砂土1/6，16 h；壤土1/10，28 h。通过柠檬酸淋洗，粘土在10~20 cm土层发生再吸附，砂土与壤土在30~40 cm土层发生再吸附。本研究为铬污染土壤修复了提供技术支持。

关键词: 农村集体经济组织, 农村集体经济组织, 股份合作社, 产权, 制度绩效

Abstract:

In order to explore extraction conditions and soil column washing about the citric acid to extract chromium (Cr) from different textures soils, the author took different concentrations, the liquid-solid ratios and the times and washing tests. The results showed that the analytical ability of the citric acid on 3 soils were sand soil>loam>clay. Sandy soil and loam needed big extraction conditions, clay needed smaller extraction conditions. Different concentrations effected extraction, when the concentration of citric acid was 0.05 mol/L, it was good to all the soils. The best liquid-solid ratio and time to soils were clay 1/14, 32 h; sandy soil 1/6, 16 h; loam 1/10, 28 h. The heavy metals contents of clay between 10 and 20 cm layer were bigger than other soil layers. The heavy metals contents of sand soil and loam between 30 and 40 cm layer were bigger than other soil layers. This research provided the technical support for removing chrome from soil.