Social and Behavioral Sciences Commons^™

An Evaluation Of Ferrihydrite- And Metsorb™-Dgt Techniques For Measuring Oxyanion Species (As, Se, V, P): Effective Capacity, Competition And Diffusion Coefficients, Helen L. Price, Peter R. Teasdale, Dianne F. Jolley

Faculty of Science, Medicine and Health - Papers: part A

tThis study investigated several knowledge gaps with respect to the diffusive gradients in thin films(DGT) technique for measurement of oxyanions (As(III), As(V), Se(IV), Se(VI), PO43−, and V(V)) usingthe ferrihydrite and MetsorbTMbinding layers. Elution efficiencies for each binding layer were higherwith 1:20 dilutions, as analytical interferences for ICP-MS were minimised. Diffusion coefficients mea-sured by diffusion cell and by DGT time-series experiments were found to agree well and generallyagreed with previously reported values, although a range of diffusion coefficients have been reportedfor inorganic As and Se species. The relative binding affinity for both ferrihydrite and MetsorbTMwasPO43−≈ As(V) > V(V) ≈ As(III) > Se(IV) ≫ …