光催化氧化-分光光度法测定自然水体中痕量总氮

用超细TiO2紫外光催化氧化反应器将各类含氮化合物完全转化为硝酸盐后用紫外分光光度法定量测定．以对硝基苯酚为主要研究对象，研究了多种光催化反应条件对降解率的影响．用本文方法对多种典型含氮化合物和自然水样进行了预氧化分解处理，痕量总氮的测出率达到95％以上，试样分解时间6min以内，且为连续流动方式，在水质在线监测方面具有良好的应用前景．

Investigation on the Spectrophotometric Determination of Trace Total Nitrogen in Natural Water by Photocatalytic Oxidation

A novel degradation method for the determination of trace nitrogen was proposed, h was based upon the fact that nitrogen in various compounds could be transformed into nitrate, which was fuirther determined by UV spectorphotometry. Several effects on the ratio of catalytic degradation were discussed according to nitrobenzene. Typical nitrogenous compounds and natural water were decomposed by the proposed method. Recoveries of trace total nitrogen were 95% and above. The degradation time is less than 6 min with a continuously floating manner. It could be easily improved to be an online monitoring method.