高压消解/流动注射光度法同时测定水中总氮与总磷

采用流动注射分析仪测定水中的总氮与总磷,结果显示,总氮在0.00～10.0 mg/L、总磷在0.00～1.00 mg/L的范围内,均可以获得良好的线性方程,相对误差<5%,相对标准差为1%～3%,方法的最低检出限分别为2.27μg/L和2.11μg/L,低于国标方法检出限,总氮的回收率为97.2%～108%,总磷的回收率为100%～106%,该方法适用于同时自动检测水中总氮与总磷的含量.

Determination of Total Nitrogen and Phosphorus in Water by Automatic High Pressure Digestion/Flow Injection Analyzer

The flow injection analyzer was used for determination of total nitrogen and phosphorus in water. The results show that there is a good linear relationship when the total nitrogen and phosphorus are in the range of 0.00 to 10.0 mg/L and 0.00 to 1.00 mg/L respectively. The relative errors are all less than 5%. The relative standard deviations are all in the range of 1% to 3%. The minimum detection limits are 2.27 μg/L and 2.11 μg/L respectively, being lower than those by the national method. The recoveries of total nitrogen and phosphorus are 97.2% to 108% and 100% to 106% respectively. The method is suitable to automatically analyze total nitrogen and phosphorus in water at the same time.