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目的确立离子色谱法测定生活饮用水中的氨氮的可行性。方法水样经0.45 nm的水性滤膜过滤,用ICS-3000离子色谱仪测定,并与水杨酸分光光度法进行比较。结果离子色谱法测定的相对偏差(RSD)为0.34%,加标回收率为99.0%～105.0%。水杨酸分光光度法测定的相对标准偏差(RSD)为0.69%,回收率为97.2%～100.0%。两种方法测定结果经统计学检验,差异无统计学意义(t=1.76,P>0.05)。结论离子色谱法精密度高,准确性好,操作简便,可同时测定多种阳离子,适用于饮用水中氨氮检测。
Objective To establish the feasibility of ion chromatography for the determination of ammonia nitrogen in drinking water. Methods Water samples were filtered through a 0.45 nm aqueous filter and compared with salicylic acid spectrophotometry using an ICS-3000 Ion Chromatograph. Results The relative deviation (RSD) measured by ion chromatography was 0.34% and the recoveries were 99.0% ~ 105.0%. The relative standard deviation (RSD) of salicylic acid was 0.69% and the recovery was 97.2% ~ 100.0%. The results of two methods were statistically tested, the difference was not statistically significant (t = 1.76, P> 0.05). Conclusion Ion chromatography has the advantages of high precision, good accuracy and simple operation. It can measure many kinds of cations simultaneously and is suitable for the detection of ammonia nitrogen in drinking water.