Determination of twelve sorts of inorganic anion in drinking water by ion chromatography

Objective:To establish a new method for quantitative detection of inorganic anion in water including fluoride,chlorite,bromate,chloride,nitrite,bromide,sulfuret,chlorate,sulfite,nitrate,phosphate,sulfate.Methods:Ion chromatography was applied.IonPac AS9 was selected as the seperation column,9.0 mmol/L Na2CO3 was eluent.After deposited,decolored and filtrated,the samples was injected and analysized.Results:Enable to easily and effectively separate and deteminate twelve sorts of inorganic anion in water.In this method,good relative(r0.9991),broad linearity range,low detection limit,good analytic accuracy and precision were obtained(RSD%2.75).The average recoveries rates were between 91.2% and 102.6%.Interferential factors such as acidity alkalinity,coexist non-determinating ions were also studied to ensure results accuracy.Conclusion:This methond is simple,rapid,sensitive and accurate.It has good adaptility to various water samples.It is suitable for simultaneous determination of twelve sorts of inorganic anion in drinking water.