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169);"> <input class="submit fl" type="submit" name="Submit" value="GO"> </form> </div> </div> </div>  <div id="dfzxrx7" class="ly_crumb"> <img src="/skins/257424/images/home.png"> <p>當前位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > <span>為什么要使用便攜式cod測定儀呢</span></p> </div>   <div id="pv7hpft" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">為什么要使用便攜式cod測定儀呢</h1> <div id="7nh7v7j" class="NyNewsdetail_tips">更新時(shí)間：2021-11-29 點(diǎn)擊次數：1090</div> <div id="drxt7nd" class="NyNewsdetail_con" id="c_detail_wrap"> <div>　　<a href="http://www.7b2c.com/jsshengaohua-Products-29440494/" target="_blank"><strong>便攜式cod測定儀</strong></a>是一款專(zhuān)門(mén)用于檢測水中COD含量而生的儀器設備，運用密閉消解管密閉消解，在強酸性溶液中，用含有一定量的重鉻酸鉀的氧化劑，并在催化劑的作用下于165℃恒溫消解水樣，使水中還原性物質(zhì)被氧化，在不同波長(cháng)下測定其未被還原產(chǎn)生的Cr6+和被還原產(chǎn)生的Cr3+的總吸光度或測定被還原產(chǎn)生的Cr3+的吸光度。<br /> </div><p align="center"><img src="https://img77.chem17.com/9/20211129/637737939476499806513.jpg" width="525" height="452" align="middle" alt="" /></p><p> </p><div>　　水質(zhì)COD我們也可以稱(chēng)之為化學(xué)需氧量，它是指在一定的條件下，采用一定的強氧化劑處理水樣所消耗的氧化劑量，是水中還原性物質(zhì)多少的一個(gè)重要指標。水中的還原性物質(zhì)有各種有機物、硫化物、亞硝酸鹽、亞鐵鹽等，通常以有機物為主，因此COD又往往作為衡量水中有機物質(zhì)含量多少的指標。當COD值越大，說(shuō)明水體受有機物的污染越嚴重。COD對水質(zhì)和生態(tài)環(huán)境的影響非常大，COD含量升高的有機污染物，一旦進(jìn)入江河湖泊，如果不能及時(shí)進(jìn)行處理，許多的有機物可能會(huì )被水底的泥土所吸附，長(cháng)年累月的積累下來(lái)，這些有機物會(huì )對水中各種生物造成傷害，并持續數年毒害作用。這個(gè)毒害作用有兩方面的影響：</div><div>　　一方面，會(huì )引起水中生物的大量死亡，水體中的生態(tài)平衡遭到破壞，嚴重的甚至直接摧毀整個(gè)河流的生態(tài)系統。</div><div>　　另一方面，毒素在魚(yú)蝦等水生物的體內慢慢進(jìn)行積累，一旦人類(lèi)進(jìn)食這些受到毒害的水生物，毒素就會(huì )隨之進(jìn)入人體，長(cháng)年積累下來(lái)，會(huì )造成致癌、畸形，基因突變等不可預測的嚴重后果。</div><div>　　當COD很高時(shí)，就會(huì )造成自然水體水質(zhì)的惡化，原因在于，水體自?xún)粜枰堰@些有機物給降解，COD的降解肯定需要耗氧，而水體中的復氧能力不可能滿(mǎn)足要求，水中DO就會(huì )直接降為0，成為厭氧狀態(tài)，在厭氧狀態(tài)也要繼續分解（微生物的厭氧處理），水體就會(huì )發(fā)黑、發(fā)臭（厭氧微生物是看起來(lái)很黑，有硫化氫氣體生成）。</div> </div> <div id="hjdxhld" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/jsshengaohua-Article-2867735/">氨氮檢測儀的使用環(huán)境要求</a></li> <li>下一篇：<a 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