CAJ | 학술논문

在一定温度下，对羟基苯甲酸与硝酸盐在浓硫酸中发生反应，生成物在碱性溶液中产生黄色化合物，该黄色化合物在390～420 nm处有强烈吸收，利用该现象可实现对硝酸盐氮的测定。为了确保对羟基苯甲酸与硝酸盐反应温度一致，用试管代替比色管、用漩涡混合器代替手动摇晃试管，结果6次平行测定3.91 mg/L硝酸盐氮标准溶液，相对标准偏差0.77%，对合成水样及实际水样加标回收率处于97.0%～102.1%。
재일정온도하，대간기분갑산여초산염재농류산중발생반응，생성물재감성용액중산생황색화합물，해황색화합물재390～420 nm처유강렬흡수，이용해현상가실현대초산염담적측정。위료학보대간기분갑산여초산염반응온도일치，용시관대체비색관、용선와혼합기대체수동요황시관，결과6차평행측정3.91 mg/L초산염담표준용액，상대표준편차0.77%，대합성수양급실제수양가표회수솔처우97.0%～102.1%。
At certain temperature and in concentrated sulfuric acid,p-hydroxybenzoic acid reacts with nitrate in water. The resultant brings about a kind of yellow compound in alkaline solution. The yellow compound has strong adsorption capacity in a range of 390-420 nm. This phenomenom can be made use of for determining nitrate nitrogen. To ensure a concordant reaction temperature for p-hydroxybenzoic acid and nitrate,a test tube is used for replacing colorimetric tube and vortex-mixture for replacing manual shaking tube. As a result,the relative standard deviations (n=6) is less than 0.77% for 3.91 mg/L of nitrate nitrogen standard solution through 6 times of parallel determi-nation. The standard recovery rates of synthetic water sample and actual water sample are between 97.0%-102.1%.