Dissolution kinetics of iron-containing particles: A review
TANG Yu-jing1,2, JIA Xiao-hong1, LI Rui1, ZHANG Guo-hua1, TANG Ming-jin1
1. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：Aerosol deposition is one of the primary sources of soluble iron in the open ocean, having significant impacts on the oceanic primary productivity. However, large uncertainties in the deposition flux of soluble iron from aerosol particles still remain, due to the following reasons:1) iron solubility varies largely for aerosol particles from different sources; 2) chemical reaction during atmospheric transport would significantly affect iron solubility of aerosol particles. Laboratory studies of dissolution kinetics of iron-containing particles in aqueous solutions in the past 20 years have been reviewed in this paper, to assess the enhancement effects on iron solubility by atmospheric aqueous reactions. Dissolution kinetics of iron-containing particles have been summarized for proton-promoted dissolution, ligand-promoted dissolution and photoreductive dissolution mechanisms. In addition, pH, anion components and light radiation jointly determined the dissolution mechanisms of iron-containing particles; and iron speciation is the major factor which determines the potential solubility of iron. Lastly, an outlook for future research was also presented.
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