地表水自动监测中电极法测定氨氮方法确认

为了对地表水自动监测中电极法测定氨氮进行方法确认,采用性能试验、方法比对、使用标准物质测量的方法对该方法进行了验证。结果表明重复性误差、零点漂移、量程漂移、最低检出限、线性相关系数满足要求,和纳氏试剂分光光度法无显著差异,经氨氮有证标准样品测试验证,该方法无明显的系统误差。

Verification of Using Electrode Method to Detect Ammonia Nitrogen in Automatic Monitoring of Surface Water

The electrode method is verified for detecting the ammonia nitrogen in the automatic monitoring of the surface water by means of performance test, comparison of methods, and testing of reference material. The results show that this method meets the requirements in respect of reproducibility error, zero drift, span drift, the lowest detection limit and the linear correlation coefficient, and the method produces little difference from the Nesslerg reagent spectrophotometry. After the verification of testing the certified standard sample of ammonia nitrogen, there is no significant system error with this method.