pH对宁夏引黄灌区盐碱化土壤重金属吸附-解吸过程的影响

发布时间：2018-07-10 09:08

  本文选题：镉 + 铅　； 参考：《生态环境学报》2017年10期

【摘要】：高pH值是宁夏引黄灌区盐碱化土壤的显著特征,研究盐碱化土壤的高pH值对不同重金属元素的富集和释放规律,可为宁夏引黄灌区盐碱化土壤重金属污染的控制及治理提供科学依据。通过调节pH值,采用土柱淋溶的方法,模拟盐碱化土壤的Cd和Pb的吸附-解吸过程,研究pH对盐碱化土壤重金属Cd、Pb吸附-解吸特征、形态和生物活性的影响。结果表明:在试验设定的pH范围内,盐碱化土壤对Cd的吸附量随着pH值的升高而呈升高趋势,在pH值为8时达到峰值,对Pb的吸附量随pH的升高呈波动状变化状态,在pH值为10时达到峰值;同时,Cd的解吸量随吸附量增加而线性增大,解吸量随pH升高而增加,但解吸量随吸附量变化而变化的幅度随pH值的升高而减小,Pb的解吸量随吸附量增加而呈选择性增加。随着pH的升高,Cd可交换态和碳酸盐结合态的含量变化趋势相反,生物活性基本不变,其Fe/Mn氧化物结合态、有机结合态和残渣态的含量不变;Pb可交换态和碳酸盐结合态的含量随着pH的升高而升高,生物活性增强,有机结合态的含量减少,Fe/Mn氧化物结合态和残渣态的含量不变。宁夏引黄灌区盐碱化土壤的高pH值可以降低土壤对重金属Cd、Pb的吸附,缓解重金属污染引起的生态、粮食及其食品安全压力。
[Abstract]:High pH value is a significant characteristic of salinized soil in Ningxia Yellow River Irrigation area. The enrichment and release of different heavy metal elements in saline-alkali soil with high pH value are studied. It can provide scientific basis for controlling and controlling heavy metal pollution of salinized soil in Ningxia Yellow River Irrigation area. The adsorption and desorption processes of CD and Pb in salinized soils were simulated by means of soil column leaching by adjusting pH value, and the effects of pH on the adsorption and desorption characteristics, morphology and biological activity of CD Pb in salinized soils were studied. The results showed that the adsorption capacity of CD on saline-alkali soil increased with the increase of pH value, reached its peak value at pH 8, and the adsorption capacity of Pb fluctuated with the increase of pH value in the range of pH. The desorption capacity of CD increased linearly with the increase of adsorption capacity, and the desorption capacity increased with the increase of pH. However, the desorption amount decreased with the increase of pH and the desorption capacity of Pb increased with the increase of adsorption capacity. With the increase of pH value, the contents of exchangeable and carbonate bound forms of CD have the opposite trend, and the biological activity is almost unchanged, and the Fe / mn oxide bound state is almost unchanged. The contents of organic bound state and residue state are invariant. The contents of exchangeable Pb and carbonate bound state increase with the increase of pH, while the content of organic bound state decreases with the increase of pH, while the content of organic bound state decreases the content of Fe / mn oxide bound state and residue state. The high pH value of salinized soil in Ningxia Yellow River Irrigation area can reduce the adsorption of heavy metal CD ~ (2 +) Pb on the soil and relieve the ecological, food and food safety pressure caused by heavy metal pollution.
【作者单位】： 宁夏大学环境工程研究院;教育部中阿旱区特色资源与环境治理国际合作联合实验室;
【基金】：宁夏自然科学基金项目(NZ16030)
【分类号】：X53

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