片段流动分析法测定水中氨氮

Segment Flow Analysis Applied to the Determination of Ammonia Nitrogen in Water

利用被亚硝基铁氰化钠催化的铵（NH4＋）与次氯酸盐和碱性苯酚溶液三者之间反应所生成的蓝色络合物（靛酚蓝）（λmax=660 nm）和应用FS-Ⅳ型流动分析仪,对水中氨（包括铵）氮作光度测定。对该方法的灵敏度、准确度和精密度进行了试验。测得的检出限、相对标准偏差及回收率值依次为0.003 mg.L^-1,〈2%及在90%~111%范围间。

By the use of the reaction among NHg, hypochlorite and alkaline solution of phenol, catalyzed by sodium nitroferricyanide, to produce a blue colored complex （λmax=660 urn） and by the use of the instrument FS-Ⅳ Flow Analyzer, ammonia （including ammonium） nitrogen in water was determined photometrically. Sensitivity accuracy and precision of the method were tested, and the values of D. L. , RSD and recovery obtained were 0. 003 mg · L^-1 , 〈2% and in the range of 90%-111% respectively.