Dissolution Factors And Oxidative Potential Of Acid Soluble Irons From Chlorite Mineral Particles

Soluble irons from aerosol particles play a key role in assessment of biological and toxicological effects as a result of their oxidative potential. Several factors are responsible for controlling the solubility of irons released from aerosol mineral particles in acid solution. Here, factors of H+ concentrations, temperatures, solid-liquid ratios and particle sizes on acidsoluble irons from chlorite mineral particles were investigated in 48h. Our data demonstrated that the higher acidity, higher temperature, lower solid-liquid ratio, and smaller particle size were factors that positively influenced the solubility of FeT and Fe(II), and that the higher acidity, lower temperature, higher solid-liquid ratio, and smaller particle size positively improved the solubility of Fe(III). Fe(II) dissolved more easily than Fe(III) in the acid solution under all conditions; the percentage of Fe(III) among the total iron released from chlorite particles could be promoted by increasing the acidity, solid-liquid ratio, and particle size, or by lowering the temperature. In this acidolysis process, there is a clear order of importance of these influencing factors, H+ concentrations > particle sizes > temperatures and solid-liquid ratios. In addition, the dissolution data for FeT at pH = 0.7 and pH = 1 in 48 h could be well described and predicted by non-linear fitting with r2 > 0.99 according to continuous dissolution model. And the analysis of oxidative potential showed that Fe(II) dissolved from chlorite possessed a dominant position in generating reactive oxygen species.