Abstract
Small quantities of nitrate, nitrite and sulphate ions may be determined simultaneously by infrared spectrophotometry, utilising the potassium bromide disk technique. The solid samples are prepared by freeze-drying aqueous solutions of these ions containing potassium bromide. An anion-exchange procedure is readily coupled with the infrared measurement through the freeze-drying step. This permits the concentration of very dilute sample solutions, and eliminates the interferences of phosphate, carbonate, and organic matter. The method has been applied to the determination of nitrate, nitrite and sulphate in water samples, where it is found to compare favourably with other methods.
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