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DKK電極是怎么樣復(fù)原的？正確浸泡DKK電極的方法。<div>　　<a href="http://m.cn-liling.com/shzmhb-ParentList-1057698/" target="_blank"><strong>DKK電極</strong></a>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)。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。DKK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。</div><div>　　因此，對DKK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DKK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。</div><div>　　(1)球泡前端不應(yīng)有氣泡，如有氣泡應(yīng)用力甩去。</div><div>　　(2)DKK電極從浸泡瓶中取出后，應(yīng)在去離子水中晃動并甩干，不要用紙巾擦拭球泡，否則由于靜電感應(yīng)電荷轉(zhuǎn)移到玻璃膜上，會延長電勢穩(wěn)定的時間，更好的方法是使用被測溶液沖洗電極。</div><div>　　(3)DKK電極插入被測溶液后，要攪拌晃動幾下再靜止放置，這樣會加快電極的響應(yīng)。尤其使用塑殼pH復(fù)合電極時，攪拌晃動要厲害一些，因為球泡和塑殼之間會有一個小小的空腔，電極浸入溶液后有時空腔中的氣體來不及排除會產(chǎn)生氣泡，使球泡或液接界與溶液接觸不良，因此必須用力攪拌晃動以排除氣泡。</div><div>　　(4)在粘稠性試樣中測試之后，<strong>DKK電極</strong>必須用去離子水反復(fù)沖洗多次，以除去粘附在玻璃膜上的試樣。有時還需先用其他溶劑洗去試樣，再用水洗去溶劑，浸入浸泡液中活化。</div><div>　　(5)避免接觸強酸強堿或腐蝕性溶液，如果測試此類溶液，應(yīng)盡量減少浸入時間，用后仔細(xì)清洗干凈。</div><div>　　(6)避免在無水乙醇、濃硫酸等脫水性介質(zhì)中使用，它們會損壞球泡表面的水合凝膠層。</div><div>　　(7)DKK電極的外殼材料是聚碳酸酯塑料(PC)，PC塑料在有些溶劑中會溶解，如四氯化碳、三氯乙稀、四qing呋喃等，如果測試中含有以上溶劑，就會損壞電極外殼，此時應(yīng)改用玻璃外殼的pH復(fù)合電極。</div><div>　　</div> 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