摘要：

中水替代天然水回用于火力发电厂具有显著的环境效益，得到广泛的应用，但是中水在利用中的生、化 过程使得中水比自然水具有高得多的腐蚀性，而氨氮含量是反映中水可用性的最重要污染物指标之一，必须对其进 行及时、准确的监测。以电极测定法为基础，建立了氨氮电极电位测定法分析系统，在优化的实验条件下，对该分析 系统的各项性能进行了测定，并与现行的纳氏试剂光度法进行了比较。结果表明：该方法满足了火电厂中水回用技 术对氨氮含量测定快速准确的要求。该方法的推广应用将具有重要的实用价值。

关键词: 中水, 氨氮, 氨气敏电极电位法, 纳氏试剂光度法

Abstract:

Regenerated water is widely used in power plants for replacing natural water because of its substantial benefit to the environment， but the characteristics of pollutants in recycled water and the biochemical process in use make the recycled water become much more corrosive than natural water. Ammonia -nitrogen content in recycled water is one of the most important pollutant indexes reflecting the availability of the recycled water. It is necessary to monitor ammonia -nitrogen content timely and accurately. Based on electrode determination， the ammonia -nitrogen determination -electrode potential determination analytical system is established. Under optimized conditions， all the performances of the analytical system are determined， and is compared with Nessler reagent photometry. The results show that as recycled water is reused in power plants， this method meets the demands of detecting the ammonia-nitrogen content quickly and accurately. Its popularization and application are of great practical meanings.

Key words: recycled water, ammonia-nitrogen, ammonia gas sensory electrode potential determination, Nessler reagent photometry

中图分类号: 

• O661

• O657