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氨氣敏電ji為一復(fù)合電ji，以pH玻璃電ji為指示電ji，銀-氯化銀電ji為參比電ji。此電ji對(duì)置于盛有0.1mol/L氯化銨內(nèi)充液的塑料管中，管端部緊貼指示電ji敏感膜處裝有疏水半滲透薄膜，使內(nèi)電解液與外部試液隔開，半透膜與pH玻璃電ji有一層很薄的液膜。當(dāng)水樣中加入強(qiáng)堿溶液將pH提高到11以上，使銨鹽轉(zhuǎn)化為氨，生成的氨由于擴(kuò)散作用而通過半透膜（水和其他離子則不能通過），使氯化銨電解質(zhì)液膜層內(nèi)NH4+?NH3+H+的反應(yīng)向左移動(dòng)，引起氫離子濃度改變，由pH玻璃電ji測(cè)得其變化。在恒定的離子強(qiáng)度下，測(cè)得的電動(dòng)勢(shì)與水樣中氨氮濃度的對(duì)數(shù)呈一定的線性關(guān)系。由此，可從測(cè)得的電位確定樣品中氨氮的含量。</p><p> 2、干擾及消除</p><p> 揮發(fā)性胺產(chǎn)生正干擾；汞和銀因同氨絡(luò)合力強(qiáng)而有干擾；高濃度溶解離子影響測(cè)定。</p><p> 3、方法適用范圍</p><p> 本法可用于測(cè)定飲用水、地面水、生活污水及工業(yè)廢水中氨氮的含量。色度和濁度對(duì)測(cè)定沒有影響，水樣不必進(jìn)行預(yù)蒸餾，標(biāo)準(zhǔn)溶液和水樣的溫度應(yīng)相同，含有溶解物質(zhì)的總濃度也要大致相同。</p><p> 4、方法的zui低檢出濃度為0.03mg/L氨氮；測(cè)定上限為1400mg/L氨氮。</p><p> 5、注意事項(xiàng)</p><p> (1) 繪制校準(zhǔn)曲線時(shí)可以根據(jù)水樣中氨氮含量自行取舍三或四個(gè)標(biāo)準(zhǔn)點(diǎn)</p><p> (2) 實(shí)驗(yàn)過程中應(yīng)避免由于攪拌器發(fā)熱而引起被測(cè)溶液溫度上升影響電位值的測(cè)定</p><p> (3) 當(dāng)水樣酸性較大時(shí)應(yīng)先用堿液調(diào)至中性后再加離子強(qiáng)度調(diào)節(jié)液進(jìn)行測(cè)定</p><p> (4) 水樣不要加保存</p><p> (5) 攪拌速度應(yīng)適當(dāng)不使形成渦流避免在電ji處產(chǎn)生氣泡</p><p> (6) 水樣中鹽類含量過高時(shí)將影響氨氮測(cè)定儀測(cè)定結(jié)果必要時(shí)應(yīng)在標(biāo)準(zhǔn)溶液中加入相同量的鹽類以消除誤差</p><p><br/></p> </div> <div id="uz4pg7q" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3083500.html">cod氨氮測(cè)定儀的特點(diǎn)</a></li> <li>下一篇：<a href="/Article-3083485.html">便攜式cod測(cè)定儀在使的特點(diǎn)</a></li> </ul> </div> </div>   <div id="uz4pg7q" class="ly_foot"> <div id="uz4pg7q" class="ly_Ftmain"> <div id="uz4pg7q" class="ly_FtLeft"> <div id="uz4pg7q" class="Ft_nav"><a href="/">首頁</a><a href="/aboutus.html" target="_blank" rel="nofollow">關(guān)于我們</a><a href="/products.html" target="_blank">產(chǎn)品展示</a><a href="/news.html" target="_blank">新聞中心</a><a href="/article.html" target="_blank">技術(shù)文章</a><a href="/honor.html" target="_blank" rel="nofollow">榮譽(yù)資質(zhì)</a></div> <div id="uz4pg7q" class="Ft_contact"> <div id="uz4pg7q" class="Ftcont_tit">聯(lián)系方式<em></em></div> <p>郵箱：1936867037@qq.com</p> 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