Abstract: A method for removing dissolved contaminants from solution using a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants, in particular, arsenate and arsenite. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated titanium oxide is combined with other filter media to further improve the removal of dissolved contaminants.

Abstract: A method for removing dissolved contaminants from solution using a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants, in particular, arsenate and arsenite. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated titanium oxide is combined with other filter media to further improve the removal of dissolved contaminants.

Abstract: A method and corresponding sorbant for removing dissolved contaminants, such as arsenate, from water. The sorbant comprises an oxide of titanium and a sulfate salt, such as calcium sulfate.

Abstract: A method for removing dissolved contaminants, such as arsenate, from water by the step of contacting a sorbant with the water, the sorbant comprising more than ten weight percent of an oxide of titanium and more than one tenth weight percent of a sulfate salt, such as calcium sulfate, having a solubility in water at room temperature of less than 0.5 grams per liter of water, wherein the oxide of titanium is primarily titanium dioxide.

Abstract: An improved method for the continuous removal of dissolved oxygen from a flowing liquid containing sample bands, the invention being effective to remove the interference of the dissolved oxygen for purposes of reductive electrochemical detection of analyte of interest. As an example of utility, using a silicone rubber membrane in a shell and tube design, typically >99 percent of the dissolved oxygen can be removed by permeation from aqueous solutions within a residence time of six seconds. Applications of the technique to the post-column removal of dissolved oxygen from ion exchange and reverse phase chromatographic mobile phases prior to reductive electrochemical detection are particularly described and claimed.

Abstract: Method for determining total organic sulfur using reductive pyrolysis and specific electrochemical detection of sulfide ion at a mercury electrode. The method is especially useful for the determination of sulfur in matrices containing halogen or nitrogen compounds. Under routine conditions, a detection limit of less than 50 parts per billion (ppb) can be achieved using differential pulse cathodic stripping voltammetry as the detection mode.