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|Title:||Occurrence, release and alteration of chromite nanoparticles|
|Keywords:||Chromite;hausmannite;chamosite;clinochlore;colloid;nanoparticles;transmission electron microscopy;aggregation;adsorption|
|Abstract:||Many environmental risk assessments are based on the total concentration of elements in natural waters/ soils, ignoring that a significant proportion of elements is associated with nanoparticles. TEM analysis of the silicate minerals from a chromitite sample from the Mum and Alice June claims, California confirmed that Cr-rich silicates contained an abundance of chromite nanoparticles. Subsequently, the colloidal fraction of a Cr-rich silicate leaching experiment revealed that the chromite nanoparticles persist through the weathering of their host silicate, confirming that chromite nanoparticles can be a significant form of Cr in the environment. The oxidation of chromite nanoparticles in the presence of Mn-oxides (best known environmental oxidiser of Cr3+) was tested with 6 batch experiments at pH 5 over a 9-month period. These experiments reveal that the dominant redox reaction between chromite nanoparticles and Mn-oxides is the oxidation of Fe2+(rather than Cr3+) by Mn3+.|
|Appears in Collections:||Geology - Master's Theses|
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|Occurence, release and alteration of chromite nanoparticles - Final - McClenaghan.pdf||2.06 MB||Adobe PDF||View/Open|
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