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/><span>如何正確浸泡pH復(fù)合電極？</span></p></div> <div id="aqgwbbhhdpu" class="clear"></div> </div> </div>   <div id="aqgwbbhhdpu" class="NyNewDetail"> <div id="aqgwbbhhdpu" class="NyNewDetail_Main"> <h1 class="NyNewDetail_Name">如何正確浸泡pH復(fù)合電極？</h1> <div id="aqgwbbhhdpu" class="NyNewDetail_Tips"> <span><img src="/skins/257424/images/ico04.png" />更新時間：2017-12-20</span><span><img src="/skins/257424/images/ico05.png" />點擊次數(shù)：3005</span> </div> <div id="aqgwbbhhdpu" class="NyNewDetail_Content" id="c_detail_wrap"> <p><span style="font-size:14px"><span style="font-family:微軟雅黑"> pH電極使用前必須浸泡，因為pH球泡是一種特殊的玻璃膜，在玻璃膜表面有一很薄的水合凝膠層，它只有在充分濕潤的條件下才能與溶液中的H+離子有良好的響應(yīng)。</span></span></p><p style="text-align:center"><img alt="" src="http://img49.chem17.com/9/20171220/636493713991508182199.jpg" style="height:457px; width:500px" /></p><p><span style="font-size:14px"><span style="font-family:微軟雅黑"> 同時，玻璃電極經(jīng)過浸泡，可以使不對稱電勢大大下降并趨向穩(wěn)定。pH玻璃電極一般可以用蒸餾水或pH4緩沖溶液浸泡。通常使用pH4緩沖液更好一些，浸泡時間8小時至24小時或更長，根據(jù)球泡玻璃膜厚度、電極老化程度而不同。同時，參比電極的液接界也需要浸泡。因為如果液接界干涸會使液接界電勢增大或不穩(wěn)定，參比電極的浸泡液必須和參比電極的外參比溶液一致，浸泡時間一般幾小時即可。</span></span></p><p><span style="font-size:14px"><span style="font-family:微軟雅黑"> 因此，對pH復(fù)合電極而言，就必須浸泡在含KCl的pH4緩沖液中，這樣才能對玻璃球泡和液接界同時起作用。這里要特別提醒注意，因為過去人們使用單支的pH玻璃電極已習(xí)慣于用去離子水或pH4緩沖液浸泡，后來使用pH復(fù)合電極時依然采用這樣的浸泡方法，甚至在一些不正確的pH復(fù)合電極的使用說明書中也會進行這種錯誤的指導(dǎo)。這種錯誤的浸泡方法引起的直接后果就是使一支性能良好的pH復(fù)合電極變成一支響應(yīng)慢、精度差的電極，而且浸泡時間越長性能越差，因為經(jīng)過長時間的浸泡，液接界內(nèi)部(例如砂芯內(nèi)部)的KCl濃度已大大降低了，使液接界電勢增大和不穩(wěn)定。當(dāng)然，只要在正確的浸泡溶液中重新浸泡數(shù)小時，電極還是會復(fù)原的。</span></span></p><p><span style="font-size:14px"><span style="font-family:微軟雅黑"> 另外，pH電極也不能浸泡在中性或堿性的緩沖溶液中，長期浸泡在此類溶液中會使pH玻璃膜響應(yīng)遲鈍。</span></span></p><p> </p><p><span style="color:#FF0000"><strong><span style="font-size:14px"><span style="font-family:微軟雅黑">正確的pH電極浸泡液的配制</span></span></strong></span></p><p><span style="font-size:14px"><span style="font-family:微軟雅黑"> 取pH4.00緩沖劑(250ml)一包，溶于250ml純水中，再加入56克分析純KCl，適當(dāng)加熱，攪拌至*溶解即成。</span></span></p><p><span style="font-size:14px"><span style="font-family:微軟雅黑"> 為了使pH復(fù)合電極使用更加方便，一些進口的pH復(fù)合電極和部分國產(chǎn)電極，都在pH復(fù)合電極頭部裝有一個密封的塑料小瓶，內(nèi)裝電極浸泡液，電極頭長期浸泡其中，使用時拔出洗凈就可以，非常方便。這種保存方法不僅方便，而且對延長電極壽命也是非常有利的，但是塑料小瓶中的浸泡液不要受污染，要注意更換。</span></span></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-1472251/">COD高低濃度的測定方法</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-1379067/">盛奧華| 實驗玻璃器皿清洗小竅門</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 id="aqgwbbhhdpu" class="w1400"> <div 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