Simultaneous Ion Chromatographic Determination of Ten Inorganic Anions in Drinking Water

Objective To establish a new method for quantitative detection of inorganic anions in drinking water including fluoride, chlorite, bromate, chloride, nitrite, bromide, chlorate, nitrate, phosphate, and sulfate. Methods Ion chromatography was applied. IonPac AS9 was selected as the separation column, 9.0mmol/L NaHCO_3 was used as the eluent. After deposited, decolored and filtrated,the sample water was injected and analyzed. Results The method showed good correlationship(r0.9991), broad linearity range, low detection limit, good analytic accuracy and precision, RSD%(2.28). The average recovery rates were between 94.0% and 103.0%. Interferential factors such as acidity alkalinity, coexisting non-determinating anions and neighbouring ions were also studied to ensure results accuracy. Conclusions The method is enabled to be easy and effectively separate and determine these 10 inorganic anions in drinking water. The method is simple, rapid, sensitive and accurate. It has good adapt to various water samples and suitable for simultaneous determination of 10 inorganic anions in drinking water.