| 柠檬酸/柠檬酸钠淋洗铬污染土壤效果及弱酸可提取态铬含量的变化 |
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| 引用本文： | 梁丽丽,郭书海,李刚,李淑彩,吴波,张玲妍.柠檬酸/柠檬酸钠淋洗铬污染土壤效果及弱酸可提取态铬含量的变化[J].农业环境保护,2011(5):881-885. |
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| 作者姓名： | 梁丽丽 郭书海 李刚 李淑彩 吴波 张玲妍 |
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| 作者单位： | [1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目（09ZY441YZ）; 国家高技术研究发展计划（863）（2009AA06310）; 国家水体污染控制与治理科技重大专项（2008ZX07208） |
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| 摘 要： | 研究了用0.2 mol.L-1柠檬酸/柠檬酸钠（摩尔比为1∶1）复合淋洗剂对污染土壤中铬的淋洗效果,及淋洗过程中C（rⅥ）和C（rⅢ）以及弱酸可提取态的含量随淋洗时间的变化,污染土壤取自于沈阳市沈北新区铬渣堆放场地污染土壤。结果表明,在该复合淋洗剂的解吸附与络合的双重作用下,总铬的短时间去除效率较高,淋洗8 h和24 h的去除率分别为33.6%和36.0%,其中淋洗24h时C（rⅥ）和C（rⅢ）的去除率分别达到38.5%和30.0%。淋洗过程中土壤中铬的形态发生了重新分配,弱酸可提取态占总铬比例增加,从而有利于铬在土壤中的迁移。
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| 关 键 词： | 铬 柠檬酸 柠檬酸钠 复合淋洗剂 弱酸可提取态 |
The Effects of Cr Removal from Contaminated Soil and the Content Changes of Acid Extractable Fraction by Citric/Sodium Citrate Leaching |
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| LIANG Li-li,GUO Shu-hai,LI Gang,LI Shu-cai,WU Bo,ZHANG Ling-yan.The Effects of Cr Removal from Contaminated Soil and the Content Changes of Acid Extractable Fraction by Citric/Sodium Citrate Leaching[J].Agro-Environmental Protection,2011(5):881-885. |
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| Authors: | LIANG Li-li GUO Shu-hai LI Gang LI Shu-cai WU Bo ZHANG Ling-yan |
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| Institution: | 1.Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;2.Graduated School of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | The Cr removal effect of contaminated soil collected from a chromite ore processing residue（COPR） deposited site in Shenbei district,Shenyang,was studied by using 0.2 mol·L-1 citric/sodium citrate（mole ratio：1∶1） leaching.Batch experiments were also performed to determine the content changes of Cr（Ⅵ）,Cr（Ⅲ） and acid extractable fraction during the leaching process.Results demonstrated that a high removal efficiency of total Cr was achieved in a short contact time,being 33.6% within 8 h and 36.0% within 24 h,partially due to the desorption and complexation of citric/sodium citrate.The removal efficiency was 38.5% for Cr（Ⅵ） and 30.0% for Cr（Ⅲ） by the end of the experiment.During the leaching process,the fractions of Cr were redistributed,and the amount of the acid extractable fraction in total Cr increased.It seemed that Cr was extracted from inaccessible fractions and was redistributed in accessible fractions,which enhanced the mobility of Cr in COPR soil. |
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| Keywords: | Cr citric acid sodium citrate composite leaching agent acid extractable fraction |
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