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首页> 外文期刊>Environmental Geology >Potential effect of environmental pollution on the degree of dissolution of iron and aluminium oxides in lateritic soils
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Potential effect of environmental pollution on the degree of dissolution of iron and aluminium oxides in lateritic soils

机译：环境污染对红壤中铁和氧化铝的溶解度的潜在影响

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Problems associated with surface and groundwater pollution by aluminium and iron is becoming a serious environmental challenge facing the limited sources of quality drinking water. Al and Fe sesquioxides predominates in most of the lateritic soils within the tropical region. Their degree of dissolution and mobility into the surface and groundwater system is determined by the chemistry of the prevailing aqueous environment. This work assessed the potential effect of environmental pollution on the chemical composition of rain and its resultant runoff, hence its contribution to the degree of dissolution of Al and Fe oxides. This was achieved by first determining the sources of pollutants which could possibly affect the physicochemical composition of runoff using remotely sensed information and field observations. Thereafter rain and runoff water samples were collected from theses pre-determined sources, and were analysed for their physicochemical compositions. Similarly, soil samples were also collected from the field and analysed for their mineral and chemical compositions. An empirical method was then employed to determine the degree of dissolution of Fe and Al oxides in aqueous solutions of varying hydrogen ion concentration which was prepared using the combinations of sulphuric acid, nitric acid, ammonium hydroxide, and deionised water. The results revealed that the degree of dissolution of Fe and Al oxides in lateritic soils increases with increasing acidity and/or alkalinity of the aqueous solutions. Increase in the acidity and/or alkalinity of the prevailing rain and runoff was attributed to their high level of ammonium, sulphate, and nitrate content which was introduced into the environment through anthropogenic activities.
机译：面对铝和铁污染地表和地下水的问题，正面临着有限的优质饮用水来源所面临的严重环境挑战。在热带地区的大多数红土土壤中，铝和铁的倍半氧化物占主导地位。它们在地表和地下水系统中的溶解度和迁移度取决于主要水环境的化学性质。这项工作评估了环境污染对雨水化学成分及其产生的径流的潜在影响，从而评估了其对Al和Fe氧化物溶解程度的影响。这是通过使用遥感信息和实地观察首先确定可能影响径流理化成分的污染物的来源来实现的。此后，从这些预定来源收集雨水和径流水样品，并对其理化组成进行分析。同样，还从田间收集了土壤样品，并对其矿物和化学成分进行了分析。然后采用经验方法确定Fe和Al氧化物在氢离子浓度变化的水溶液中的溶解度，该溶液是使用硫酸，硝酸，氢氧化铵和去离子水的组合制备的。结果表明，Fe和Al氧化物在红壤性土壤中的溶解度随水溶液的酸度和/或碱度的增加而增加。普遍降雨和径流的酸度和/或碱度的增加归因于它们通过人类活动引入环境中的铵，硫酸盐和硝酸盐含量很高。

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