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Element Analysis-isotope Mass Spectrometry System:an Alternative Method for Measuring Total Nitrogen Contents

ZHU Yun,LEI Guo-liang,LIN Yan-yu,CHEN Xiu-ling(Institute of Geography,Fujian Normal University,Key Laboratory of Humid Subtropical Eco-geographical Process,Ministry of Education,Fuzhou 350007,China)  
Total Nitrogen(TN) can be obtained from nitrogen isotope ratio(15N/14N) measured through EA-MS,although EA-MS was mainly designed for the measurement of nitrogen isotope ratio.Using Nitrate standards of known nitrogen contents(i.e.IAEA N-1 and IAEA N-2 ω(ΤN)=21.21%),the function between nitrogen content and signal recorded by EA-MS was constructed.With the measuring of KNO3,NaNO2 and Urea,it was confirmed that this function was suitable for analyzing normal forms of nitrogen(NH4+,NO3-,NO2-).Both EA-MS system and Kjeldahl method produced consistent results for plant and sediment samples.It shows the EA-MS method for TN was reliable.Using this method,will reduce the analysis cost,and it is very useful for trace samples.
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