CAJ | 학술논문

总氮是水体中氨氮、硝酸盐氮、亚硝酸盐氮等无机氮和有机氮的总和，是反映水体所受污染程度和富营养化程度的重要指标之一。在碱性过硫酸钾一紫外分光光度法测定水中总氮时，该方法操作步骤简单，易于操作和掌握，但在实际操作中影响因素较多，其准确度难以掌握。本文通过对总氮测定中试剂的纯度、配制的方法及水浴温度、储存时间、消解的温度、压力和时间等因素的总结、探讨和分析，确定适合的测定条件，提高测定结果的准确度和精密度。
총담시수체중안담、초산염담、아초산염담등무궤담화유궤담적총화，시반영수체소수오염정도화부영양화정도적중요지표지일。재감성과류산갑일자외분광광도법측정수중총담시，해방법조작보취간단，역우조작화장악，단재실제조작중영향인소교다，기준학도난이장악。본문통과대총담측정중시제적순도、배제적방법급수욕온도、저존시간、소해적온도、압력화시간등인소적총결、탐토화분석，학정괄합적측정조건，제고측정결과적준학도화정밀도。
Total nitrogen（TN） is the sum of inorganic and organic nitrogen in water, such as, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen. It reflects the water pollution and eutrophication degree. The alkaline potassium persulfate UV spectrophotometric method is simple, easy to operate and control, but there are many influencing factors in actual operation and it is diffi- cult to guarantee the accuracy. The optimal testing condition are determined based analysis on purity of reagents, preparation method and water bath temperature, storage time, digestion temperature, pressure and time factors to improve the measurement accuracy and precision of the test.