Solubility, sorption, and soil respiration effects of tungsten and tungsten alloys
Solubility, sorption, and soil respiration effects of tungsten and tungsten alloys
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DOI：
10.1080/15275920490423980
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发表时间：
2004-03-01
影响因子：
1.8
通讯作者：
Larson, S
中科院分区：
文献类型：
--
作者：
Dermatas, D;Braida, W;Larson, S
这项实验室研究解决了与钨和钨氧化物在环境（土壤-水）中的归宿和运输有关的问题。将二氧化钨和三氧化钨溶解在pH从4.0调节至11.0的水溶液中。对于初始pH值小于10.0，溶解钨浓度保持相当恒定的约10.0 mg/L的WO 2和增加从0.3 mg/L到2.0 mg/L的WO 3与初始pH值的增加值。大量的溶解钨被发现时，钨粉或合金件暴露于水溶液。溶解沿着溶液pH和溶解氧浓度的耗尽而发生。根据存在的合金元素，最终溶解的钨浓度从70到475 mg/L变化。pH值的降低、溶解氧的消耗和高水平的溶解钨可能与环境法医学有关。在铁、镍、钴等合金元素的存在下，钨强烈吸附到特征良好的模型土壤中。钨的吸附伊利石和蒙脱石粘土发生与pH值的增加，似乎是不可逆的。这种行为可显著地延迟钨的移动性。钨粉与土壤的混合比例高于3%（w/w），导致土壤基质酸化，并对土壤微生物群落有显着的影响，通过土壤呼吸测定。
This laboratory study addresses issues related to the fate and transport of tungsten and tungsten oxides in the environment (soil-water). Tungsten dioxide and tungsten trioxide were dissolved in aqueous solutions whose pH had been adjusted from 4.0 to 11.0. For initial pH smaller than 10.0, dissolved tungsten concentration remained fairly constant at around 10.0 mg/L for WO2 and increased from 0.3 mg/L to 2.0 mg/L for WO3 with increasing values of initial pH. Large amounts of dissolved tungsten were found when tungsten powder or alloy pieces were exposed to aqueous solutions. The dissolution occurs along depletion in solution pH and dissolved oxygen concentration. Depending upon the alloying elements present, the final dissolved tungsten concentration varied from 70 to 475 mg/L. Reduction in pH, dissolved oxygen depletion, and high levels of dissolved tungsten may be of relevance to environmental forensics. In the presence of alloying elements such as iron, nickel, and cobalt, tungsten strongly sorbed to well-characterized model soils. Sorption of tungsten to illite and montmorillonite clays occurs with an increase in pH and appears to be nonreversible. This behavior may significantly retard tungsten mobility. The mixing of tungsten powder with soils at rates higher than 3% (w/w) resulted in acidification of the soil matrix and had a significant impact on soil microbial community as determined by soil respiration.