Zhao Zhen-Hua, Zhang Ping, Chen Yong-Heng, Yao Yan, Wu Ying-Juan, Geng Xin-Hua, Deng Xiang-Zhou
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2010 Dec;30(12):3375-8.
Pyrite is one of the common natural mineral. It is easily oxidized and brings heavy metal contaminations, therefore it is the main source of acidity mine drainage. The study on the dynamics of pyrite is helpful to comprehending the mechanism of its pollution. In the present paper, an experimental method was designed that phenanthroline reacts with Fe2+ that is released from pyrite in solution, and produces stable orange-red complex compound. It can be detected by absorption spectroscopy. In-situ characterization of oxidation of pyrite can be achieved by this method. The results showed that the method is reliable and accurate, and it has high sensitivity and little interference; the reaction rate of oxidation increased linearly with time, corresponding to the characterization of zero-order reaction; oxidation of pyrite belongs to the surface reaction and the process of surface reaction is rate determining step.
黄铁矿是常见的天然矿物之一。它易于氧化并带来重金属污染，因此是酸性矿山废水的主要来源。对黄铁矿动力学的研究有助于理解其污染机制。本文设计了一种实验方法，即邻菲罗啉与溶液中黄铁矿释放的Fe2+反应，生成稳定的橙红色络合物。可通过吸收光谱法进行检测。通过该方法可实现黄铁矿氧化的原位表征。结果表明，该方法可靠、准确，具有高灵敏度和低干扰；氧化反应速率随时间呈线性增加，符合零级反应特征；黄铁矿的氧化属于表面反应，表面反应过程是速率决定步骤。
