【摘要】 目的建立大气中硝酸盐和硫酸盐同时分离测定的离子色谱分析方法。方法以超纯水超声浸提分离滤膜采集的气溶胶样品中阴离子,提取液经过简单过滤后,直接进样分析。选用高容量阴离子交换分析柱IonPac AS11-HC及其保护柱AG11-HC,以20.0mmol/L KOH作为淋洗液,以1.00ml/min的流速进行等度洗脱,抑制型电导检测,较好地完成了大气中硝酸盐和硫酸盐的含量测定。结果本方法线性良好,硝酸盐和硫酸盐测定的线性相关系数r≥0.9999,对大气中硝酸盐和硫酸盐含量分析的方法定量限分别为0.011和0.024μg/m3。样品中硝酸盐和硫酸盐的加标回收率为99.6%～105.6%,样品平行测定结果相对标准偏差RSD<3%。结论该方法操作简单、快速、准确、灵敏度高,适用于大气中硝酸盐和硫酸盐的测定。更多还原

【Abstract】 Objective A method for determination of nitrate(NO-3) and sulfate(SO42-) in air of residential areas by ion-chromatography(IC) was established.Methods The anions in aerosol samples collected with filter member were extracted by ultrasonic leaching and separated on IonPac AS11-HC analytical column and IonPac AG11-HC guard column with 20.0 mmol/L potassium hydroxide eluted at 1.00 ml/min,and then detected by DS6 suppressed conductivity detector,with the satisfactory determination of atmospheric nitrate and sulfate.Results The correlation coefficient of nitrate and sulfate were greater than 0.9999.The quantification limit of NO-3 and SO42-was 0.011μg/m3 and 0.024μg/m3 respectively.The sampling filter members were divided into four parts equally and spiked,and the recoveries of nitrate and sulfate were 99.6% ～105.6%.The relative standard deviation(RSD) of nitrate and sulfate were less than 3%.Conclusion The method was simple,rapid,reproductive and sensitive for determination of nitrate and sulfate in air of residential areas.更多还原