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class="detail_title">WTW在線分析儀測定總氮時要做哪些準備</h1> <div class="details_tongji">發布時間：2022-09-16　點擊量：<span id="Click">207</span> </div> <div class="n_con"> <div>　　想要了解<strong><a href="http://www.zbzuoxiang.cn/Products-22171122.html" target="_blank">WTW在線分析儀</a></strong>如何測定總氮，就必須要弄明白什么是氮。水質中大部分氮的產生來自農業土壤的降雨和沖洗。而其中的一小部分來自污水和工業廢物。氮在環境中扮演著非常重要的角色所有發生在地面，地面和廢水中的生物過程都離不開它。</div><div>　　</div><div>　　目前天然存在于環境中中的氮有以下幾種形式：氣態氮，氨氮，硝酸鹽，亞硝酸鹽和亞硝酸鹽，以及許多有機化合物簡單歸類為有機氮。而水中之總氮為硝酸鹽氮、亞硝酸鹽氮、凱氏氮之總和。</div><div>　　</div><div>　　WTW在線分析儀測總氮的分析方法：</div><div>　　</div><div>　　總氮由無機氮和有機氮組成。有三個主要程序如何分解所有氮素物質并將它們轉化為單一類型的可測量化合物。</div><div>　　</div><div>　　1、基于硝酸鹽和亞硝酸鹽還原成銨然后對樣品的消化。這種減少可以由Devarda的合金直接進行，也可以由鋅進行與間苯三酚反應后。間苯三酚形成硝基和亞硝基間苯二酚被鋅還原為它們的氨基衍生物。將礦化的樣品堿化并蒸餾氨。</div><div>　　</div><div>　　2、堿化的水樣用過氧化氫氧化消化，在約150℃和增加的壓力條件下加入二硫酸鹽。樣品可以用微波、烤箱或電加熱塊。由常規測定消化產生硝酸鹽的方法</div><div>　　</div><div>　　3、氮化合物在氧氣中催化點燃在1000℃的環境中形成與臭氧反應的NO的測量方法。</div><div>　　</div><div>　　無機氮的分析是由于對廢水質量的要求，污水處理廠和河水處理廠。這個參數應該是總和的硝酸鹽，亞硝酸鹽和銨。這個建議不一定適用于含有的工業網點其他無機氮化合物，如來自煤碳化的氰化物和硫氰化物。另一種方法是計算總氮和有機氮之間的差異。</div> </div> </div> <div class="artview_prev_next"> <p class="artview_prev"><span></span>上一篇：<a href="/Article-1086627.html">關于臺式分光光度計維護小常識的介紹</a></p> <p class="artview_next"><span></span>下一篇：<a 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