Methodology: | As Cr(VI) does not precipitate readily, chemical reduction followed by precipitation is a widely used technique for Cr(VI) removal. The resulting Cr(III) has low solubility in water and can either be precipitated as Cr(III) hydroxide or adsorbed on iron hydroxides and subsequently being removed from water through filtration. However, in this treatment process the role of natural organic matter has rarely been investigated and is not sufficiently understood. As a result the removal of Cr(VI) from natural organic containing ground water is a delicate task, especially if low concentration of total chromium are targeted. |