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目的:建立同时测定饮用水中7种无机阴离子含量的测定方法。方法:样品用0.2μm滤膜过滤后直接进样,离子色谱法同时测定氟化物、氯化物、亚硝酸盐氮、溴化物、硝酸盐、硫酸盐和磷酸盐。色谱柱为:IonPac AS19型阴离子交换色谱柱(4 mm×250 mm i.d)和IonPac AG19保护柱;检测方式为:抑制型电导检测器。结果:本法相关性好(r>0.9993),精密度高(RSD%<3.0),样品加标回收率为95.0%～103.7%,检出限分别为:F-:0.0015 mg/L;Cl-:0.0010 mg/L;NO2--N:0.0019 mg/L;SO42-:0.0012 mg/L;Br-:0.0018 mg/L;NO3-:0.0013 mg/L;HPO24-:0.0023 mg/L。结论:该方法操作简单、快速、准确、线性范围广,可满足大批量水样检测分析要求。
Objective: To establish a method for simultaneous determination of 7 inorganic anions in drinking water. Methods: Samples were filtered directly on a 0.2 μm filter and simultaneously determined for fluoride, chloride, nitrite, bromide, nitrate, sulfate and phosphate by ion chromatography. The columns were: IonPac AS19 anion exchange column (4 mm × 250 mm i.d) and IonPac AG19 guard column; detection mode: suppressed conductivity detector. Results: The method has good correlation (r> 0.9993), high precision (RSD% <3.0), spiked recoveries of samples ranged from 95.0% to 103.7%, and the detection limits were: F-: 0.0015 mg / -: 0.0010 mg / L; NO2-N: 0.0019 mg / L; SO42-: 0.0012 mg / L; Br-: 0.0018 mg / L; NO3-: 0.0013 mg / L; HPO24-: 0.0023 mg / L. Conclusion: The method is simple, rapid, accurate and has a wide linear range. It can meet the requirements of large-scale water samples detection and analysis.