當氨氮 ≥ 總氮時的處理方式
在進行總氮和氨氮的檢測時，使用較多的方法分別是《堿性過硫酸鉀消解紫外分光光度法》（HJ636-2012）和《納氏試劑分光光度法》（HJ535-2009）?？偟亩x是水中各種形態(tài)無機和有機氮的總量，包括NO3-、NO2-和 NH4+等無機氮和蛋白質、氨基酸和有機胺等有機氮，以每升水含氮毫克數計算。氨氮是指水中以游離氨（NH3）和銨離子（NH4+）形式存在的氮。兩者常被用來表示水體受營養(yǎng)物質污染的程度。
理論上總氮等于氨氮、有機氮與硝態(tài)氮的和，在實際的實驗中往往達不到理論上的結果，部分樣品會存在氨氮 ≥ 總氮。為什么會出現這種倒掛的情況，是哪一步出現了問題？
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