超声波萃取离子色谱法测定固定污染源有组织废气中的硫酸雾

Determination of sulfuric acid mist in waste gas of stationary pollution source

建立离子色谱法测定固定污染源有组织废气样品中硫酸雾的分析方法。采用ICS-3000型离子色谱仪,色谱柱为IonPacAS18,以23mmol/L氢氧化钾溶液为淋洗液,流速为1.0mL/min;用玻璃纤维滤筒采样,加水超声萃取,过阳离子交换树脂柱,微孔滤膜过滤后测定样品中的硫酸根离子含量,将结果换算为硫酸含量。方法的线性范围为0.5～20mg/L,r=0.9995,检出限为0.1mg/L,在0.5、2、10mg/L浓度下进行精密度试验,RSD均小于5.0%(n=6),回收率为95%～106%。该方法操作简便、快速、准确,是理想的有组织废气中硫酸雾样品测定方法。

An ion chromatographic method was developed for the determination of sulfuric acid mist in waste gas of stationary pollution source.An ICS-3000 ion chromatograph was used.The separation was on an Ion PacAS18 column with KOH as eluant（1.0 mL/min）.The sample was collected with a glass fiber filter tube and was ultrasonically extracted after adding water.The extracted sample was passed through a cation-exchange resin column and a filter membrane before determination.The linear range was 0.5~20.0mg/L（r=0.9995）.The dtection limit was 0.1mg/L,the RSD was 5.0%（n=6）,and the recovery was 95%~106%.The method is simple to operate,rapid and accurate.