Abstract
A method for determining nitrogen oxides and sulfur oxides by ion chromatography was investigated in order to develop a method for eliminating nitrogen oxides and sulfuric oxides in stack gas using nitrate melts. A Toyo Soda IC-Anion-PW column, an electrical conductivity detector and a UV detector were used. The effect of pH and concentrations of phosphoric acid and gluconic-Borax complex on retention times were investigated for nitrite, nitrate, sulfite and sulfate ions in an aqueous solution. A solution containing 0.7mM potassium gluconate, 0.7mM Borax, 0.1mM potassium dihydrogen phosphate and EDTA (1.5mM/l) adjusted to pH 7.4 with boric acid was found to be an optimum eluent. Nitrous acid, sulfurous acid and sulfuric acid in nitrate melts containing abundant ions of nitric acid were determined by this method.
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