the influence of sediment redox chemistry on chemically active forms of arsenic, cadmium, chromium, and zinc in estuarine sediment

摘要

Kinetics and chemical fractionation procedures were used to quantify the effect of the sediment redox (Eh) conditions on the behaviour of As, Cd, Cr, and Zn in the bottom sediment collected from a Louisiana coastal site receiving produced water discharge. Sediument samples were incubated in microcosms in which Eh-pH conditions were controlled. Sediment was sequentially extracted to determine metals in various chemical fractions (water soluble, exchangeable, bound to carbonates, bound to iron and manganese oxides bound to insoluble organic and sulfides) and the chemical inactive fraction (mineral residue).