离子色谱法应用于杭州地表水中有机酸及无机阴离子分布研究

Study on the Distribution of Organic Acids and Inorganic Anions in Surface Water in Hangzhou by Ion Chromatography

建立了离子色谱-抑制电导法同时检测杭州市地表水中的有机酸及无机阴离子,并对地表水中有机酸及无机阴离子的含量进行探讨。该方法的重现性(RSD)为0.15%~4.92%,相关系数r^(2)为0.9990~0.9999,加标回收率为84.36%~111.05%,最低检出限为0.003~0.028 mg/L。利用该建立的方法,对4种有机酸和7种无机阴离子的含量进行了测定,测定结果分析表明,杭州市地表水中的无机阴离子主要是SO_(4)^(3-)、Cl^(-)、NO_(3)^(-),其主要来源于机动车尾气和工业废水等;有机酸主要是甲酸、乙酸,其主要来源于机动车尾气、化工厂的直接排放。杭州市各地区由于地形地势等条件的差异,地表水中有机酸及无机阴离子的浓度含量不同,检测值差异较大。

An ion chromatography with inhibition conductance method was established for simultaneous determination of organic acids and inorganic anions in Hangzhou surface water.And the content of organic acids and inorganic anions in surface water were discussed.The repeatability of the method(RSD)is 0.15%~4.92%,the correlation coefficient r^(2) is 0.9990~0.9999,the standard addition recovery is 84.36%~111.05%,and the lowest detection limit is 0.003~0.028 mg/L.Using the establishedmethod,the contents of 4 kinds of organic acids and 7 kinds of inorganic anions were determined.The analysis results show that the inorganic anions in Hangzhou city surface water are mainly SO_(4)^(3-),Cl^(-),NO_(3)^(-),which mainly come from vehicle exhaust and industrial waste water,etc.Organic acids are mainly formic acid and acetic acid,which mainly come from automobile exhaust and direct emissions from chemical plants.Due to the difference of terrain and other conditions,the concentrations of organic acids and inorganic anions in the surface water in different areas of Hangzhou are different,and the detection values are quite different.