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Chemical reactions of uranium in ground water at a mill tailings site

机译:磨矿尾矿中地下水中铀的化学反应

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We studied soil and ground water samples from the tailings disposal site near Tuba City, AZ, located on Navajo sandstone, in terms of uranium adsorption and precipitation. The uranium concentration is up to 1 mg/1, 20 times the maximum concentration for ground water protection in the United States. The concentration of bicarbonate(HCO~-_3)in the ground water increased from≤7×10~-4 M, the background concentration, to 7×10~-3 M. negatively charged uranium carbonate complexes prevail at high carbonate concentrations and uranium is not adsorbed on the negatively charged mineral surfaces.
机译:我们研究了位于纳瓦霍砂岩上的亚利桑那州图巴市附近尾矿处置场的土壤和地下水样品,研究了铀的吸附和沉淀。铀浓度最高为1 mg / 1,是美国地下水保护最高浓度的20倍。地下水中的碳酸氢根(HCO〜-_3)浓度从≤7×10〜-4 M(背景浓度)增加到7×10〜-3M。在高碳酸盐浓度和铀浓度下,带负电荷的碳酸铀络合物普遍存在不会吸附在带负电的矿物表面上。

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