对测量海水中总溶解氮（TDN）的两种常用方法——高温燃烧法和过硫酸钾氧化法进行了比较。结果表明，两种方法在空白、精密度和准确度实验中不存在显著差异。对不同化合物的回收率均在92％～107％之间，加标回收实验回归曲线的斜率分别为0．93和0．92。对于现场海水样品的测定结果，两个断面拟合的斜率分别为0．92和0．97。HTC法比PO法对实际海水样品的氧化效率略高，在操作上也更方便、快捷。因此，高温燃烧法更适合海水中总溶解氮（TDN）的测定。%Nitrogen is an important nutrition for halobios . As an important component of total dissolved nitro- gen（TDN）, dissolved organic nitrogen （DON） has been paid more and more attention. Now, essentially all routine methods measure total dissolved nitrogen （TDN） and calculate DON by subtracting the dissolved inorganic nitrogen （DIN）. In this study, two common methods for determination of DON： persulfate oxidation （PO） and high tempera- ture combustion （HTC） were compared. The results show that both methods have good agreements at blank, precision and accuracy. They also resulted in high recovery for various nitrogen-containing compounds （92%-107%） with a slope of 0.93 and 0.92, respectively, which indicates a high oxidation rate. The results of field samples showed the slope of section linear fit results is 0.92 and 0.97. So both methods had their own advantages, but HTC method is more efficient.
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