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<span>pH計你知道多少？</span></p> </div>   <div id="ad8vrx8" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">pH計你知道多少？</h1> <div id="xqmdz9i" class="NyNewsdetail_tips">更新時(shí)間：2021-05-06 點(diǎn)擊次數：1918</div> <div id="nlm85d8" class="NyNewsdetail_con"> <div>　　1.什么是pH標準緩沖溶液？它有哪些特點(diǎn)？<br /> </div><div>　　pH緩沖溶液是一種能使pH值保持穩定的溶液。如果向這種溶液中加入少量的酸或堿，或者在溶液中的化學(xué)反應產(chǎn)生少量的酸或堿，以及將溶液適當稀釋?zhuān)@個(gè)溶液的pH值基本上穩定不變，這種能對抗少量酸堿或稀釋?zhuān)筽H值不變化的溶液就稱(chēng)為緩沖溶液。<br /> </div><div>　　pH標準緩沖液有以下特點(diǎn)：<br /> </div><div>　　(1)標準溶液的pH值是已知的，并達到規定的準確度；<br /> </div><div>　　(2)標準溶液的pH值有良好的復現性和穩定性，具有較大的緩沖容量，較小的稀釋值和較小的溫度系數；<br /> </div><div>　　(3)溶液的制備方法簡(jiǎn)單。<br /> </div><div>　　2.pH緩沖溶液有何用途？<br /> </div><div>　　(1)pH測量前標定校準pH計。<br /> </div><div>　　(2)用以檢定pH計的準確性，例如，用pH=6.86和pH=14.00，標定pH計后，將pH電極插入pH=9.18溶液中，檢查儀器顯示值和標準溶液的pH值是否一致。<br /> </div><div>　　(3)在一般精度測量時(shí)檢pH計是否需要重新標定。pH計標定并使用后也許會(huì )產(chǎn)生漂移或變化，因此在測試前將電極插入與被測溶液比較接近的標準緩沖液中，根據誤差大小確定是否需要重新標定。<br /> </div><div>　　(4)檢測pH電極的性能。<br /> </div><div>　　3.如何配制pH標準緩沖溶液？<br /> </div><div>　　對于一般pH測量，可使用成套的pH緩沖試劑(可配制250mL)，配制溶液時(shí)，應使用去離子水，煮沸15～30分鐘(加適量玻璃珠，防止爆沸)，以除去溶解的二氧化碳。剪開(kāi)塑料袋將試劑倒入燒杯中，用適量去離子水使之溶解，并沖洗包裝袋，再倒入250mL容量瓶中，稀釋至刻度，充分搖勻即可。<br /> </div><div>　　4.pH電極為何要浸泡？如何正確浸泡pH復合電極？<br /> </div><div>　　因為pH球泡是一種特殊的玻璃膜，在玻璃膜表有一很薄的凝膠層，它只有在充分濕潤的條件下才能與溶液中的氫離子有良好的影響。同時(shí)，玻璃電極經(jīng)過(guò)浸泡，可以使不對稱(chēng)電勢大大下降并趨向穩定。<br /> </div><div>　　pH復合電極一般用3.3mol/LKCl溶液或飽和KCl溶液浸泡。<br /> </div><div>　　正確的pH電極浸泡液的配制：取pH=4.00緩沖劑(250mL)一包，溶于250mL純水中，再加入56克分析純KCl，適當加熱，攪拌至*溶解即成。<br /> </div><div>　　5.如何正確使用pH復合電極？<br /> </div><div>　　(1)球泡前端不應有氣泡，如有氣泡應用力甩去。<br /> </div><div>　　(2)電極從浸泡瓶中取出后，應在去離子水中晃動(dòng)并甩干，不要用紙巾擦拭球泡，否則由于靜電感應電荷轉移到玻膜上，會(huì )延長(cháng)電勢穩定的時(shí)間，更好的方法是使用被測溶液沖洗電極。<br /> </div><div>　　(3)pH復合電極插入被測溶液后，要攪拌晃動(dòng)幾下再靜止放置，這樣會(huì )加快電極的響應。尤其使用塑殼pH復合電極時(shí)，攪拌晃動(dòng)要厲害一些，因為，球泡和塑殼之間會(huì )有一個(gè)小小的空腔，電極浸入溶液后有時(shí)空腔中的氣體來(lái)不及排除會(huì )產(chǎn)生氣泡，使球泡與溶液接觸不良，因此必須用力攪拌晃動(dòng)以排除氣泡。<br /> </div><div>　　(4)在粘稠性試樣中測試之后，電極必須用去離子水反復沖洗多次，以除去粘附在玻璃膜上的試樣。有時(shí)還需先用其它試劑洗去試樣，再用水洗去溶劑，浸入浸泡液中活化。<br /> </div><div>　　(5)避免接觸強酸強堿或腐蝕性溶液，如果測試此類(lèi)溶液，應盡量減少浸入時(shí)間，用后仔細清洗干凈。<br /> </div><div>　　(6)避免在無(wú)水乙醇、濃硫酸等脫水性介質(zhì)中使用，它們會(huì )損壞球泡表面的水合凝膠層。<br /> </div><div>　　6.什么是pH計的二點(diǎn)校準?<br /> </div><div>　　對于精密級的pH計，除了設有“定位”和“溫度補償”調節外，還設電極“斜率”調節，它就需要用二種標準緩沖液進(jìn)行校準。一般先以pH=6.86或pH=7.00進(jìn)行“定位”校準，然后根據測試溶液的酸堿情況，選用pH=4.00(酸性)或pH=9.18或pH=10.01(堿性)緩沖溶液進(jìn)行“斜率校正，具體操作步驟為：<br /> </div><div>　　(1)電極極洗凈并甩干，浸入pH=6.86或pH=7.00標準溶液中，溫度補償旋鈕置于溶液溫度處。待示值穩定后，調節定位旋鈕使儀器示值為標準溶液的pH值。<br /> </div><div>　　(2)取出電極洗凈并甩干，浸入第二種標準溶液。待示值穩定后，調節儀器斜率旋鈕，使儀器的示值為第二種標準溶液的pH值。<br /> </div><div>　　(3)電極極洗凈并甩干，再浸入pH6.86或pH7.00標準溶液中，如果誤差超過(guò)0.02pH，則重復第(1)，(2)步驟。直至在二種標準溶液中不需要調節旋鈕都能顯示正確的PH值。<br /> </div><div>　　(4)取出電極洗凈并甩干，將pH溫度補償旋鈕調節至樣品溫度，將電極浸入樣品溶液，晃動(dòng)后靜止放置，顯示穩定后讀數。<br /> </div><div>　　7.如何判斷你的pH計是否準確？<br /> </div><div>　　取三個(gè)標準緩沖溶液：pH=6.86、pH=4.00、pH=9.18(較好是新鮮配制并且溫度相同),以pH=6.86F進(jìn)行定位校準,以pH=4.00進(jìn)行斜率校準,然后測試pH=9.18，pH計是否準確，是否合格立見(jiàn)分曉。<br /> </div><div>　　注意事項<br /> </div><div>　　儀器在使用前必須進(jìn)行校準。如果儀器不關(guān)機，可以連續測定，一旦關(guān)機就要校準。但12小時(shí)即使不關(guān)機也必須校準一次。</div> </div> <div id="3wxjfbf" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-2641357.html">一體防爆電導率儀的原理及特點(diǎn)講解</a></li> <li>下一篇：<a href="/Article-2632550.html">你知道溶氧儀在水產(chǎn)養殖中有哪些作用嗎？</a></li> </ul> </div> </div>   <div id="ryul38w" class="ly_foot"> <div id="t3ulwip" class="ly_Ftmain"> <div id="333rija" class="ly_FtLeft"> <div id="nl9sefb" class="Ft_nav"><a href="/">首頁(yè)</a><a href="/aboutus.html" target="_blank">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">榮譽(yù)資質(zhì)</a></div> <div id="h8htpqn" class="Ft_contact"> <div id="dkwxt3m" 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