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目的建立一种离子色谱-电导检测方法,用于同时测定雾霾空气PM2.5中的5种阳离子(Na+、NH+4、K+、Mg2+、Ca2+)。方法采用超声法对石英纤维滤膜上待测物进行提取,ICS-5000离子色谱仪进行测定,保留时间定性,外标法定量。结果在一定的浓度范围内,各待测物的分离效果好,分离度≥1.8。在各自的线性范围内,各组分的峰面积与质量浓度呈良好的线性关系,相关系数(r)均>0.999。Na+、NH+4、K+、Mg2+、Ca2+的检出限分别为0.000 8μg/m3、0.002 5μg/m3、0.002 0μg/m3、0.002 0μg/m3、0.001 4μg/m3,各个组分的回收率为91.9%~108.0%,相对标准偏差(RSD)为0.2%~3.5%。结论该方法中样品处理简便、快速,方法的灵敏度高、重现性好,可用于雾霾天气PM2.5中Na+、NH+4、K+、Mg2+、Ca2+5种阳离子的检测。
Objective To establish an ion chromatography-conductivity detection method for the simultaneous determination of five kinds of cations (Na +, NH + 4, K +, Mg2 +, Ca2 +) in haze air PM2.5. Methods Ultrasound was used to extract the analytes on the quartz fiber filter. The ICS-5000 ion chromatograph was used to determine the retention time and the external standard method. The results in a certain concentration range, the separation of the test substance is good, resolution ≥ 1.8. Within their respective linear ranges, the peak area of each component showed a good linear relationship with the mass concentration, and the correlation coefficient (r) was> 0.999. The detection limits of Na +, NH + 4, K +, Mg2 + and Ca2 + were 0.0008μg / m3, 0.002μg / m3, 0.002μg / m3, 0.002μg / m3 and 0.001μg4μg / m3 respectively. The recoveries of each component were 91.9 % ~ 108.0%, relative standard deviation (RSD) was 0.2% ~ 3.5%. Conclusion The method is simple, rapid, sensitive and reproducible. It can be used to detect Na +, NH + 4, K +, Mg2 + and Ca2 + in haze weather PM2.5.