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class="NyNewDetail"> <div id="aqgwbbhhdpu" class="NyNewDetail_Main"> <h1 class="NyNewDetail_Name">簡述電極法測試氨氮的含量</h1> <div id="aqgwbbhhdpu" class="NyNewDetail_Tips"> <span><img src="/skins/257424/images/ico04.png" />更新時間：2015-09-11</span><span><img src="/skins/257424/images/ico05.png" />點擊次數(shù)：2850</span> </div> <div id="aqgwbbhhdpu" class="NyNewDetail_Content" id="c_detail_wrap"> <p> 1、方法原理<br /> 氨氣敏電極為一復(fù)合電極，以pH玻璃電極為指示電極，銀-氯化銀電極為參比電極。此電極對置于盛有0.1mol/L氯化銨內(nèi)充液的塑料管中，管端部緊貼指示電極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玻璃電極有一層很薄的液膜。當(dāng)水樣中加入強堿溶液將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+ÖNH3+H+的反應(yīng)向左移動，引起氫離子濃度改變，由pH玻璃電極測得其變化。在恒定的離子強度下，測得的電動勢與水樣中氨氮濃度的對數(shù)呈一定的線性關(guān)系。由此，可從測得的電位確定樣品中氨氮的含量。<br /> 2、干擾及消除<br /> 揮發(fā)性胺產(chǎn)生正干擾；汞和銀因同氨絡(luò)合力強而有干擾；高濃度溶解離子影響測定。<br /> 3、方法適用范圍<br /> 本法可用于測定飲用水、地面水、生活污水及工業(yè)廢水中氨氮的含量。色度和濁度對測定沒有影響，水樣不必進行預(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。<br /> 4、方法的zui低檢出濃度為0.03mg/L氨氮；測定上限為1400mg/L氨氮。<br /> 5、注意事項<br /> (1) 繪制校準(zhǔn)曲線時可以根據(jù)水樣中氨氮含量自行取舍三或四個標(biāo)準(zhǔn)點<br /> (2) 實驗過程中應(yīng)避免由于攪拌器發(fā)熱而引起被測溶液溫度上升影響電位值的測定<br /> (3) 當(dāng)水樣酸性較大時應(yīng)先用堿液調(diào)至中性后再加離子強度調(diào)節(jié)液進行測定<br /> (4) 水樣不要加氯化汞保存<br /> (5) 攪拌速度應(yīng)適當(dāng)不使形成渦流避免在電極處產(chǎn)生氣泡<br /> (6) 水樣中鹽類含量過高時將影響氨氮測定儀測定結(jié)果必要時應(yīng)在標(biāo)準(zhǔn)溶液中加入相同量的鹽類以消除誤差</p> </div> <div id="aqgwbbhhdpu" class="NyPro_PrevNext"> <p class="NyProPrev"><img src="/skins/257424/images/jt10.png" />上一個：<a href="/jsshengaohua-Article-963147/">COD智能消解器的特點介紹</a></p> <a href="/article.html" class="NyProAll"><img src="/skins/257424/images/ProAll.png" />返回列表</a> <p class="NyProNext">下一個：<a href="/jsshengaohua-Article-823085/">新型COD智能消解器的概述</a><img src="/skins/257424/images/jt11.png" /></p> <div id="aqgwbbhhdpu" class="clear"></div> </div> </div> </div>   <div id="aqgwbbhhdpu" class="lyFoot"> <div id="aqgwbbhhdpu" class="lyFoot_main"> <div id="aqgwbbhhdpu" class="lyFoot_con"> <div 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