离子色谱法测定净水产品中F^-﹑Cl^-﹑NO_2^-﹑NO_3^-﹑HPO_4^(2-)和SO_4^(2-)

ANALYSIS OF FLUORID,CHLORIDE,NITRITE,NITRATE,PHOSPHATE AND SULFATE IN WATER PURIFICATION PRODUCTS BY ION CHROMATOGRAPHY

建立了离子色谱法测定净水产品中的F-、Cl-、NO2-、NO3-、HPO42-、SO42-6种阴离子。根据净水产品的类型分别选择配制水浸提和直接净化配制水两种方法处理样品,选用IonPac AS9-HC色谱柱(250 mm×4 mm),8.0 mmol/L Na2CO3为淋洗液,抑制电导检测。方法的检出限为0.007～0.13 mg/L,定量下限为0.02～0.41 mg/L,相对标准偏差为0.9%～1.4%(n=6)。净水杯、净水器、超滤净水器和反渗透净水器等净化处理水的加标回收率为84.2%～103.8%。该方法操作简便、准确可靠、灵敏度高,适用于净水产品中痕量阴离子的检测。

A method was developed for the determination of fluorid, chloride, nitrite, nitrate, phosphate and sulfatein water purification products by ion chromatography coupled with suppressed conductivity detection. According to the types of water purification products, the sample was soaked with tap water （ control of water） or the tap water was pretreated directly. The separation of six anions was performed on IonPac AS9 - HC analytic column（ 250 mm × 4 mm ）with an eluent containing 8.0 mmol/1 Na2CO3. The limit of detection and limit of quantification were 0.007 - 0.13 mg/L and 0.02 - 0.41 mg/L respectively with the relative standard deviations of 0.9% - 1.4% （ n = 6）. The method was applied successfully for the determination of six anions in water samples pretreated by water - purification cup, water purifier, ultrafihration purifier and reverse osmosis apparatus with recoveries of 84.2% - 103.8%. Results demonstrated that the method was simple, accurate, reliable and sensitive for the determination of trace anions in water purification products.