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href="/Article/addyxe_1.html">氨氮的影響 (二)</a></div> <div id="zugiup3" class="left2"> <div id="kmjvgiv" class="left2top"> </div> <div id="33oaloa" class="left2_main"> <div id="3gbc3k3" class="n_info_con" id="printableview"> <h1> 氨氮的影響 (二)</h1> <div id="alezuzd" class="info_con_tit"> <div id="33oc33b" class="info_con_tit"> <div id="lolwj3m" class="n_tit"> <span>文章出處：</span><span>網(wǎng)責(zé)任編輯：</span><span>作者：</span><span>人氣：<span id="cntrHits">-</span></span><span>發(fā)表時(shí)間：2013-10-25 20:06:00</span> </div> </div> </div> <div class="cfhwa3m" id="cntrBody"> <p>關(guān)于氨的毒性，以前常以<a href="http://www.hnzhuanke.com/adqcj/adqcjgtfm.html">總氨</a>(NH3+NH4+)的濃度表示，然而在pH值等水質(zhì)條件不同時(shí)，即使總氨量一樣，毒性也可能相差很大，而用分子氨濃度表示毒性，就更為確切。養(yǎng)殖水域離子氨允許的濃度為每升5mg氮，而分子氨在每升0.2～1mg氮濃度時(shí),就對(duì)大多魚(yú)類(lèi)產(chǎn)生危害。<br /> <br /> 養(yǎng)殖水域分子氨濃度允許的值僅為每升0.1mg氮。滲進(jìn)生物體內(nèi)的分子氨(NH3)，將血液血紅蛋白分子的Fe2+氧成為Fe3+,降低血液的載氧能力，使呼吸機(jī)能下降。氨主要是侵襲粘膜，特別是魚(yú)鰓表皮和腸粘膜，其次是神經(jīng)系統(tǒng)，使魚(yú)類(lèi)等水生動(dòng)物的肝腎系統(tǒng)遭受破壞;引起體表及內(nèi)臟充血，嚴(yán)重的發(fā)生肝昏迷以致死亡。即使是低濃度的氨，長(zhǎng)期接觸也會(huì)損害鰓組織，出現(xiàn)鰓小片彎曲、粘連或現(xiàn)象。<br /> <br /> <strong>亞硝酸鹽及其毒性<br /> <br /> </strong>亞硝酸鹽是硝反應(yīng)不能完全進(jìn)行的間產(chǎn)物，水體溶氧缺乏，水性偏酸，加重了亞硝酸鹽的毒性。此外在秋冬季節(jié)，池塘水溫的突然變，也會(huì)阻礙硝的作用，使亞硝酸鹽的濃度增。亞硝酸鹽的作用機(jī)理主要是通過(guò)生物的呼吸，由鰓絲進(jìn)入血液，與血紅蛋白結(jié)合形成鐵血紅蛋白。血紅蛋白的主要功能是運(yùn)輸氧氣，而鐵血紅蛋白不具備這種功能，從而導(dǎo)致養(yǎng)殖生物缺氧，甚窒息死亡。一般情況下,當(dāng)水體亞硝酸鹽濃度達(dá)到0.1mg/l,就會(huì)對(duì)養(yǎng)殖生物產(chǎn)生危害。<br /> <br /> <strong>硝酸鹽氮及其危害<br /> </strong><br /> 一般認(rèn)為硝酸鹽對(duì)水生動(dòng)物沒(méi)有不良影響，其實(shí)在水體硝酸鹽的濃度較(60mg/l)、時(shí)間較長(zhǎng)時(shí)，也有一定的危害。較濃度的硝酸態(tài)氮，如果不能及時(shí)被微生物或植物吸收轉(zhuǎn)為其它形式帶走，一直會(huì)處于三態(tài)氮的動(dòng)態(tài)循環(huán)，一旦水體溶氧不足，隨時(shí)都會(huì)轉(zhuǎn)入反硝過(guò)程，又以<a href="http://www.hnzhuanke.com/adqcj/adqcjgtfm.html">氨氮</a>、亞硝酸鹽的形式危害水生動(dòng)物。溫室大棚缺乏光照的育苗與養(yǎng)殖水體，排污換水不及時(shí)氨氮不易脫離出水體，誘發(fā)出種種病害，致使太多的養(yǎng)殖與育苗生產(chǎn)不成功或失敗。如在20世紀(jì)90年代我國(guó)的養(yǎng)鰻、養(yǎng)鱉及部分蝦蟹育苗產(chǎn)業(yè)大起大落，長(zhǎng)期難以擺脫困境，與水體有機(jī)物質(zhì)轉(zhuǎn)不暢、自然生境模仿不成功等因素有直接的關(guān)系。</p> <p> </p> </div> <div id="eigvxko" class="apage" id="showfenye">   </div> <div id="al2soyl" class="gduo"> <span>下一篇：<a href="http://www.hnzhuanke.com/Article/addyxy_1.html" title="氨氮的影響 (一)">氨氮的影響 (一)</a></span>上一篇：<a href="http://www.hnzhuanke.com/Article/coddwh_1.html" title="COD的危害"> COD的危害</a></div> </div> <div id="nxa2eau" class="info_key"> <span>此文關(guān)鍵字：</span><a target='_blank' href="/Search/Index.aspx?kwd=%e6%b0%a8%e6%b0%ae%e5%8e%bb%e9%99%a4%e5%89%82">氨氮去除劑</a> <a target='_blank' href="/Search/Index.aspx?kwd=%e6%b0%a8%e6%b0%ae%e5%ba%9f%e6%b0%b4%e5%a4%84%e7%90%86">氨氮廢水處理</a> <a target='_blank' 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