碱性过硫酸钾氧化-气相分子吸收光谱法测定水中总氮  

Total Nitrogen Determination in Water by Gas Molecular Absorption Spectrometry with Alkaline Potassium Persulfate Oxidation

作　　者：莫怡玉 茅丽秋 吴卓智 

机构地区：[1]湛江市海洋与渔业环境监测站,广东湛江524039 [2]湛江市港务管理局环境监测站,广东湛江524027

出　　处：《环境监测管理与技术》2010年第4期47-49,共3页The Administration and Technique of Environmental Monitoring

摘　　要：采用碱性过硫酸钾氧化-气相分子吸收光谱法测定水中总氮,用螺纹盖聚四氟乙烯消化管代替比色管,称重法校正体积,加大NaOH用量,讨论了干扰及消除办法。方法在0μg^20.0μg范围内线性良好,检出限为0.016 mg/L,标准溶液平行测定的RSD≤1.5%,实际水样加标回收率为99.2%~102%,测量结果的扩展不确定度为3.3%。Total nitrogen in water was determined by gas molecular absorption spectrometry with potassium persulfate oxidation.The detection used polyfluortetraethylene digestive tubes with whorl cap instead of colorimeter tubes,volume calibration by weighing method and increased NaOH dosage.The interference and its eliminate measurement were discussed.A good linearity was in range from 0 μg to 20.0 μg.The detection limit was 0.016 mg/L.RSD of parallel standard solution was ≤1.5%.Spiked recoveries of samples were between 99.2% and 102%.Expanded uncertainty of test results was 3.3%.

关 键 词：总氮 碱性过硫酸钾 气相分子吸收光谱法 水质 

分 类 号：O657.3[理学—分析化学]