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)消耗水中的溶解氧。在氧充足情況下，氨氮又可進(jìn)一步被硝化細菌氧化成亞硝酸鹽氮和硝酸鹽氮，繼續消耗水中的溶解氧。地表水體中如果存在較高的氨氮，能對水生生物造成毒害，毒害作用主要是由水中分子氨(NH3)造成的。分子氨對魚(yú)類(lèi)是極毒的，可使魚(yú)類(lèi)產(chǎn)生毒血癥。<div>　　因此使用<strong>氨氮測定儀</strong>測定氨氮非常有必要，那么在測定時(shí)需要注意哪些問(wèn)題呢？</div><div>　　進(jìn)行氨氮剖析的實(shí)驗室，室內不能有揚塵喝銨鹽類(lèi)化合物，不要與硝酸鹽氮等剖析項目同時(shí)進(jìn)行，由于硝酸鹽氮測試中須運用氨水，而氨水的揮發(fā)性很強，納氏試劑吸取氛圍中的氨而導致測試結果偏高。所運用的試劑、玻璃器皿等實(shí)行用品要獨自寄存，避免穿插污染，影響空缺值。</div><div>　　使用氨氮測定儀進(jìn)行實(shí)驗時(shí)對水的要求很高，平常的蒸餾水一般達不到實(shí)行要求，需進(jìn)行二次加工得到無(wú)氨水。依據實(shí)際工作經(jīng)歷，在用蒸餾法制備無(wú)氨水時(shí)，應棄去前一部分餾出液和后一部分鎦出液，只取中間部分餾出液于密封玻璃瓶中保存，如許制取的無(wú)氨水空缺值低，但二次加工制取無(wú)氨水腳時(shí)費力，也不經(jīng)濟。用復合樹(shù)脂交流柱制得新穎去離子水替代無(wú)氨水進(jìn)行氨氮的測定，空缺吸光度能到達實(shí)行要求。</div> </div> <div id="7ff5lfl" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/jsshengaohua-Article-1914126/"> 為什么總氮測定儀越來(lái)越受到大家的青睞</a></li> <li>下一篇：<a href="/jsshengaohua-Article-1844252/">留心！測定氨氮需要注意這些事</a></li> </ul> </div> </div>   <div id="rhd5ntz" class="foot_box"> <div id="ldbvvzd" class="footCon"> <div id="txhxrld" 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