當(dāng)氨氮 ≥ 總氮時(shí)的處理方式
在進(jìn)行總氮和氨氮的檢測(cè)時(shí)，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）。總氮的定義是水中各種形態(tài)無機(jī)和有機(jī)氮的總量，包括NO3-、NO2-和 NH4+等無機(jī)氮和蛋白質(zhì)、氨基酸和有機(jī)胺等有機(jī)氮，以每升水含氮毫克數(shù)計(jì)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(zhì)污染的程度。
理論上總氮等于氨氮、有機(jī)氮與硝態(tài)氮的和，在實(shí)際的實(shí)驗(yàn)中往往達(dá)不到理論上的結(jié)果，部分樣品會(huì)存在氨氮 ≥ 總氮。為什么會(huì)出現(xiàn)這種倒掛的情況，是哪一步出現(xiàn)了問題？
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