Journet E. auteur aut IRD Desboeufs K. V. auteur aut IRD Caquineau Sandrine auteur aut IRD Colin J. L. auteur aut IRD text journalArticle eng To understand the impact of dust deposition on ocean primary productivity, the evaluation of dust input is not sufficient, and the soluble iron supply is also needed. Measurements of iron in aerosols suggest a much higher solubility than in soil, implying substantial atmospheric processing of chemical or physical nature. Here, we have investigated the effect of the mineralogy on iron solubility. We have measured iron solubility from some minerals commonly found in dust (clay, feldspar and iron (hydr-)oxides). Firstly, we observe a greater solubility of iron resulting from clays (similar to 4%) in comparison to iron (hydr-) oxides (<1%), independently of specific surface of minerals. Secondly, by considering amount of dissolved iron and the mineralogical composition of dust, our results indicate that dissolved iron fraction mainly comes from clay dissolution in contrast to that assumed in some biogeochemical models. In consequence, it appears that iron solubility is closely linked to the mineralogical composition of aerosol. specialized 064 35 7 NIL_47-NIL_51 2008 0094-8276 https://www.documentation.ird.fr/hor/PAR00002293 10.1029/2007GL031589 0094-8276 https://www.documentation.ird.fr/hor/PAR00002293 IRD - Base Horizon / Pleins textes 2008-05-06 2017-08-23 PAR00002293 fre