同时测定电厂炉水PO_4^(3-)、SiO_3^(2-)的注入试剂流动注射分析

Simultaneous Determination of Phosphate and Silicate in Boiler Water in Power Plants with Reversed Flow Injection Spectrophotometry

本法利用FIA—T1—721流动注射仪,基于形成硅钼蓝和磷钼蓝反应,以炉水作载流,用双注入试剂时间差法建立一次注入监测两种物质的方法。此法适用于中压、高压、超高压及亚临界锅炉水质的监测,监测速度比现有PO_4^(3-)表、S_1O_3^(2-)表快15倍,可望作为一种新型炉水磷、硅同时监测的在线分析法。

In this paper a new method of simultaneous determination of phosphate and silicate in boiler water in power plants by the reversed flow injection analysis (rFIA)-spectrophotometry was established using a selfmade instrument FIAT1-721 based on time difference between the reagent injections. The rFIA method is used for water quality monitoring in middle, high, superhigh and suberitical pressure boilers. The analytical speed of the method is about 15 times higher than that of conventional on-line phosphate analyzer and silicate analyzer.