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首页> 外文期刊>Journal of applied sciences and environmental management >Comparative Dissolution of Natural Goethite Samples in HCl and HNO_3
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Comparative Dissolution of Natural Goethite Samples in HCl and HNO_3

机译：天然针铁矿样品在HCl和HNO_3中的相对溶解度

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The dissolution of goethite samples in mineral acids from to extreme parts of Nigeria (Osogbo and Kaduna) have been investigated. The rate of dissolution was found to be slightly faster in HCl than HNO_3. The higher rate of dissolution in HCl could be attributed to the complcxing ability of Cl~- in addition to the H~+ effect while lowering effect by NO_3~- was attributed to adsorption of NO_3 on to the gocthitc surface. Mononuclcar complexes, especially bidcntatc of oxyanion are found to accelerate dissolution as opposed to binuclcar complexes. A binuelear bidenlale surface complex formation between NO_3~- and Fe~(3+) was therefore proposed to account for the inhibition observed. The possible formation of Fe—Cl reduces both the surface positive charge and the repulsion between the oxide surface and protons in solution. This produced accelerated proton dissolution. The effect of temperature on the initial dissolution rale fil into Arrhcnius equation, with Kaduna goethite exhibiting higher rale than Osogbo type in both acids. The activation energies for Kaduna goethite sample are 66.11 and 82.43 kJmol~(-1) in 0.1M HCl and 0.1M HNO_3 respectively while for Osogbo goelhite sample are 54.60 and 76.32 kJmol~(-1) in 0.1M HCl and 0.1M HNO_3 respectively. The frequency factors of 8.4 x 10~(-4) & 11.17x10~(-4) snd 5.0 x 10~(-5) and 3.09 x 10~(-3) for Kaduna and Osogbo goethite samples were oblained.
机译：已经研究了针铁矿样品在矿物酸中从尼日利亚到极端地区（Osogbo和Kaduna）的溶解。发现在HCl中的溶解速率比HNO_3稍快。在HCl中较高的溶解速率除了归因于H〜+效应外，还归因于Cl〜-的络合能力，而NO_3〜-的降低作用归因于NO_3吸附在Gocthitc表面上。与单核糖复合物相反，发现单核糖复合物，尤其是氧阴离子的双胍可加速溶解。因此，提出了在NO_3〜-和Fe〜（3+）之间形成双耳二联体表面复合物的方法，以解释所观察到的抑制作用。 Fe-Cl的可能形成减少了表面的正电荷以及氧化物表面和溶液中质子之间的排斥。这产生了加速的质子溶解。温度对初始溶解度规则的影响符合Arrhcnius方程，在两种酸中，Kaduna针铁矿均显示出比Osogbo型更高的规则性。 Kaduna针铁矿样品在0.1M HCl和0.1M HNO_3中的活化能分别为66.11和82.43 kJmol〜（-1），而Osogbo针铁矿样品在0.1M HCl和0.1M HNO_3中的活化能分别为54.60和76.32 kJmol〜（-1）。 。 Kaduna和Osogbo针铁矿样品的频率因子分别为8.4 x 10〜（-4）和11.17x10〜（-4），分别为5.0 x 10〜（-5）和3.09 x 10〜（-3）。

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