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pH和磷的交互作用对稳定化土壤砷释放的影响

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发表于 2019-3-4 14:19:35 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
pH和磷的交互作用对稳定化土壤砷释放的影响
Interacting effect of pH and phosphorus on the release of arsenic from stabilized soil
投稿时间:2017-05-04??修订日期:2017-09-18
DOI:
中文关键词:??稳定化土壤????pH????释放
Key Words:stabilized soil??arsenic??pH??phosphorus??release
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
徐文义 华东师范大学上海市城市化生态过程与生态恢复重点实验室 652680654@qq.com
谢爱军 上海立昌环境工程股份有限公司
黄民生 华东师范大学上海市城市化生态过程与生态恢复重点实验室 mshuan@des.ecnu.edu.cn
摘要点击次数: 27
全文下载次数: 16
中文摘要:
? ?? ?以3种含铁材料稳定化土壤(FeSO4、FeS和Fe0稳定化土壤)为研究对象,研究了不同pH和磷的交互作用对砷释放量的影响及其作用机理。结果表明,在pH=3条件下,随着时间的延长能够促进释放的砷重新趋于稳定化,而pH=11时3种稳定化土壤中砷的释放量显着增加,144h后分别约为前者的10.5、16和10倍。添加磷时,在3种pH条件下都促进了稳定化土壤中砷的释放,尤其在酸性条件下,相对于无磷体系砷的释放量增加最为明显。FeSO4稳定化土壤中砷的释放特征能用Elovich方程较好的描述,而双常数方程拟合FeS和Fe0稳定化土壤效果更优。在pH=3条件下,3种稳定化土壤中砷的释放量与Ca、Mg、Mn的溶出量呈(极)显着相关,而pH=11时FeSO4和FeS稳定化土壤中砷的释放量与SO42-的溶出量呈(极)显着相关,表明在酸性条件下,稳定化土壤砷的释放主要受Ca、Mg、Mn氧化物结合态砷溶解的影响,而碱性条件下,FeSO4和FeS稳定化土壤中砷的释放可能与硫化物的溶解有关。
Abstract:
? ?? ?Three kinds of stabilized soil (FeSO4、FeS and Fe0 stabilized soil) were chosen to study the interacting effect of pH and phosphorus on the release of arsenic and the mechanisms involved. The results showd that the arsenic release tended to stabilize again over time at pH 3, whereas the amount of arsenic release from three kinds of stabilzed soil dramatically increased at pH 11, after 144h reaching ~10.5, ~10 and ~16 times higher than the former, respectively. The addition of phosphorus promoted the release of arsenic from the stabilized soil at all three pH values studied. Especially, under acidic conditions, the increment of arsenic release relative to the treatments in the absence of phosphorus were highest. The arsenic release from FeSO4 stabilized soil could be described better by Elovich equation, while power function equation fitted FeS and Fe0 stabilized soil more appropriate. The amount of arsenic release was (highly) significantly correlated with the amount of dissolved Ca、Mg and Mn from three kinds of stabilized soil at pH 3, while there was (highly) signifigant correlation between arsenic and SO42- release from FeSO4 and FeS stabilized soil at pH 11. This implied that the arsenic release from stabilized soil was influenced mainly by dissolution of Ca、Mg and Mn oxides bounded As under acidic conditions, while arsenic release from FeSO4 and FeS stabilized soil might relate with dissolution of sulfides under alkaline conditions.
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