中文摘要：

大气气溶胶中含铁的矿物在铁的生物地球化学循环中起着重要作用。Fe3O4是气溶胶中一类重要的含铁矿物。采用分光光度法测定Fe3O4在草酸中的溶解特征,分析Fe3O4溶解的速率控制机理并对溶解Fe3O4进行动力学模拟。结果表明,草酸溶解铁的过程可能是受运移和表面反应综合制约的溶解动力学过程,其他动力学模拟结果表明,草酸溶解Fe3O4控制机理比较复杂。

英文摘要：

Iron-containing phases present in mineral dust aerosol play a key role in the global biogeochemical cycling of iron.Fe3O4 is one of important iron oxides in mineral dust aerosol.The amounts of Fe3O4 dissolved by oxalic acid were determined using spectrophotometer.Rate-controlled mechanisms were analyzed and related kinetic models evaluated.The result showed that the rate-limited steps included both solute mass transfer in the bulk solution and surface reaction in the solid during the dissolution of Fe3O4 by oxalic acid aqueous solution.Kinetic data did not satisfactorily conform to the solid-liquid equilibrium,heterogeneous surface reaction,and solid-phase diffusion equations,respectively and this indicated that the dissolution mechanism of Fe3O4 by oxalic was complex.