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href="/news.html">新聞中心</a> > <span>pH計如何維護保養(yǎng)？常見問題怎么解決？盛奧華為您支招！</span></p> </div>   <div id="sq82xwe7wu" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">pH計如何維護保養(yǎng)？常見問題怎么解決？盛奧華為您支招！</h1> <div id="sq82xwe7wu" class="NyNewsdetail_tips">更新時間：2017-06-14 點擊次數(shù)：2473</div> <div id="sq82xwe7wu" class="NyNewsdetail_con" id="c_detail_wrap"> <p><span style="font-family:helvetica neue"> </span><span style="font-family:helvetica neue">pH</span><span style="font-family:helvetica neue">計是化驗室中常見的一種小型檢測設備。對于ph計的使用和維護，一般人都會說很簡單、很容易。但實際上你對ph計的使用、維護、保養(yǎng)真的清楚了解嗎？是否要打一個小小的“？”</span></p><p><span style="font-family:helvetica neue"> <strong> 盛奧華</strong>專注環(huán)保水質(zhì)檢測儀行業(yè)已有20余年，為廣大新老客戶、朋友提供了很多的水質(zhì)監(jiān)測解決方案?？蛻舻臐M意，是我們zui大的回報，也是我們一直以來的追求。<strong>盛奧華</strong>研發(fā)生產(chǎn)的水質(zhì)檢測儀器種類繁多，包含臺式、便攜式、手持式、按鍵式、觸屏式等等。</span></p><p><span style="font-family:helvetica neue"> 首先為大家簡單科普一下<strong>盛奧華</strong>自主研發(fā)的兩款pH計：</span><span style="color:rgb(0, 176, 240)"><strong><span style="font-family:helvetica neue">臺式 PHS-300型、手持式 PHB-9型</span></strong></span><span style="font-family:helvetica neue">。如下圖：</span></p><p style="text-align:center"><span style="font-family:helvetica neue"><img alt="" src="http://img59.chem17.com/9/20170614/636330444048765767799.jpg" style="height:334px; width:500px" /> </span></p><p style="text-align:center"><span style="color:rgb(0, 112, 192)"><strong><span style="font-family:helvetica neue">圖1：臺式</span></strong><strong><span style="font-family:helvetica neue">pH</span></strong><strong><span style="font-family:helvetica neue">計：PHS-300型</span></strong></span></p><p style="text-align:center"><span style="color:rgb(255, 0, 0); font-family:wingdings"><span style="font-family:helvetica neue">◇</span></span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">全觸屏式臺式酸度計，個性化觸摸按鍵</span></p><p style="text-align:center"><span style="color:rgb(255, 0, 0); font-family:wingdings"><span style="font-family:helvetica neue">◇</span></span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">自動識別標準緩沖液功能，三點校準</span></p><p><span style="color:rgb(255, 0, 0); font-family:wingdings"><span style="font-family:helvetica neue"> ◇</span></span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">自動識別溫度補償功能</span></p><p style="text-align:center"><span style="font-family:helvetica neue"><img alt="" src="http://img60.chem17.com/9/20170614/636330444325354253683.jpg" style="height:383px; width:352px" /> </span></p><p style="text-align:center"><span style="color:rgb(0, 112, 192)"><strong><span style="font-family:helvetica neue">圖2：手持式</span></strong><strong><span style="font-family:helvetica neue">pH</span></strong><strong><span style="font-family:helvetica neue">計：PHB-9型</span></strong></span></p><p style="text-align:center"><span style="color:rgb(255, 0, 0); font-family:helvetica neue">◇</span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">背光LCD液晶顯示（可關掉）</span></p><p style="text-align:center"><span style="color:rgb(255, 0, 0); font-family:helvetica neue">◇</span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">同時顯示pH、溫度或mV（ORP）、溫度</span></p><p style="text-align:center"><span style="color:rgb(255, 0, 0); font-family:helvetica neue"> ◇</span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">具有手動溫度補償功能，支持二點標定，三點校正</span></p><p><span style="color:rgb(255, 0, 0); font-family:helvetica neue"> ◇</span><span style="color:rgb(255, 0, 0); font-family:helvetica neue">外形新穎，攜帶方便，操作簡便</span></p><p> </p><p><strong><span style="font-family:宋體">下面重點來嘍！本文主要從三方面出發(fā)：ph計的原理、保養(yǎng)、常見問題及解決方案，為大家詳細闡述pH計的方方面面。</span></strong></p><p><strong><span style="font-family:宋體">一.pH計的原理</span></strong></p><p><span style="font-family:helvetica neue">通過測定電極與參比電極組成的工作電池在溶液中測得的電位差，并利用待測溶液的pH值與工作電池的電勢大小之間的線性關系，再通過電流計轉換成pH單位數(shù)值來實現(xiàn)測定。</span></p><p> </p><p><strong><span style="font-family:宋體">二.pH計的保養(yǎng)</span></strong></p><p><strong><span style="font-family:helvetica neue">1.pH計玻璃電極的貯存</span></strong></p><p><span style="font-family:helvetica neue">pH計短期內(nèi)不用時，可充分浸泡在飽和溶液中。但若長期不用，應將其干放，切忌用洗滌液或其他吸水性試劑浸洗。</span></p><p><strong><span style="font-family:helvetica neue">2.pH玻璃電極的清洗</span></strong></p><p><span style="font-family:helvetica neue">玻璃電極球泡受污染可能使電極響應時間加長?？捎肅Cl4或皂液揩去污物，然后浸入蒸餾水一晝夜后繼續(xù)使用。污染嚴重時，可用5％HF溶液浸10～20分鐘，立即用水沖洗干凈，然后浸入0.1N HCl溶液一晝夜后繼續(xù)使用。</span></p><p><strong><span style="font-family:helvetica neue">3.玻璃電極老化的處理</span></strong></p><p><span style="font-family:helvetica neue">玻璃電極的老化與膠層結構漸進變化有關。舊電極響應遲緩，膜電阻高，斜率低。用氫氟酸浸蝕掉外層膠層，經(jīng)常能改善電極性能。若能用此法定期清除內(nèi)外層膠層，則電極的壽命幾乎是無限的。</span></p><p> </p><p><strong><span style="font-family:宋體">三.常見問題及解決方案</span></strong></p><p><strong><span style="font-family:helvetica neue">1.同一樣品，兩次測量的pH值不一樣？</span></strong></p><p><span style="font-family:helvetica neue">溫度變化或樣品本身發(fā)生了化學反應，都會引起pH值的變化。所以，應盡量保持溫度一致，并且避免化學反應。</span></p><p><strong><span style="font-family:helvetica neue">2.同一樣品，同時在兩臺pH計上測量，讀數(shù)不一致？</span></strong></p><p><span style="font-family:helvetica neue">由于兩臺pH計的校正條件不一樣（如，不同時間做的校正），造成測量值有差異。所以要用同一緩沖液在同一時間里對pH計進行校正，然后再同時測定。</span></p><p><strong><span style="font-family:helvetica neue">3.為什么緩沖液在有效期內(nèi)已經(jīng)變質(zhì)不能使用了？</span></strong></p><p><span style="font-family:helvetica neue">緩沖液的有效期是指未開封使用狀態(tài)下的保存期。一旦開封使用后，由于空氣中各種霉菌的作用，緩沖液較易變質(zhì)。 </span></p><p><span style="font-family:helvetica neue">注意：已使用過的緩沖液，千萬不能倒回原裝瓶中！</span></p><p><strong><span style="font-family:helvetica neue">4.電極需多久校準一次？</span></strong></p><p><span style="font-family:helvetica neue">電極的校準頻率取決于電極的使用、保養(yǎng)、樣品性質(zhì)以及測量精度等具體情況。建議每天校準一次，zui長不要超過每周一次校準。更換電極以及長時間不使用，在使用前必須先校準。</span></p><p><strong><span style="font-family:helvetica neue">5.如何保養(yǎng)pH電極？</span></strong></p><p><span style="font-family:helvetica neue">電極使用一段時間后，若發(fā)現(xiàn)斜率變低、響應速度變慢等情況，可嘗試下列方法:</span></p><p><span style="font-family:helvetica neue">①若測量樣品中含有蛋白質(zhì)，可用胃蛋白酶/鹽酸洗液清洗電極膜。 </span></p><p><span style="font-family:helvetica neue">②若測量樣品為油性/有機液體，可用丙酮或乙醇沖洗。</span></p><p><span style="font-family:helvetica neue">③若發(fā)現(xiàn)電極液絡部變臟變黑，可用硫醇清洗液清洗液絡部。</span></p><p><strong><span style="font-family:helvetica neue">6.樣品溫度為10℃，此時儀表顯示的是10℃還是25℃下的pH值？</span></strong></p><p><span style="font-family:helvetica neue">酸度計顯示的是溶液在當前溫度下的pH值,若在10℃測量，儀表顯示的是溶液10℃的值,如果需要得到25℃的pH，必須把溶液溫度升/降溫至25℃，再進行測量。酸度計的溫度補償指的是補償溫度對pH電極的影響，但不能將任何溫度下的pH值補償?shù)?5℃。</span></p><p><strong><span style="font-family:helvetica neue">7.為什么電極放在pH7.00的緩沖液中校正后，顯示為 7.02？</span></strong></p><p><span style="font-family:helvetica neue">此時緩沖液溫度在20℃左右。由于緩沖液的pH值會隨溫度變化有小量變化，7.00只是緩沖液在25℃下的值，而緩沖液在20℃時的值應為7.02。pH計能自動補償溫度對緩沖液的影響以保證測量精度。</span></p><p><strong><span style="font-family:helvetica neue">8.pH電極壽命有多長？</span></strong></p><p><span style="font-family:helvetica neue">pH電極的壽命與測量樣品的性質(zhì)、樣品溫度及使用的頻率、保養(yǎng)情況有關。在正常使用、正確保養(yǎng)的情況下，pH電極壽命為1至2年。</span></p><p><strong><span style="font-family:helvetica neue">9.檢測pH計準不準?</span></strong></p><p><span style="font-family:helvetica neue">測pH計準不準?*可靠和zui簡單的方法就是以pH標準緩沖溶液來進行檢定。取三個pH標準緩沖溶液：pH6.86、pH4.00、pH9.18（是新鮮配制并且溫度相同），以pH6.86進行定位校準，以pH4.00進行斜率校準，然后測試pH9.18看pH計是否準確，是否合格立見分曉。如果精度不合格，還可以進一步判斷是pH計有問題還是pH電極有問題。 </span></p><p><strong><span style="font-family:helvetica neue">10.pH計數(shù)字不穩(wěn)定現(xiàn)象原因總結：</span></strong></p><p><span style="font-family:helvetica neue">①檢查電極是否已損壞；</span></p><p><span style="font-family:helvetica neue">②應該是電極使用的時間太長了，先校準看一下是否有效；</span></p><p><span style="font-family:helvetica neue">③</span><span style="font-family:helvetica neue">清洗一下玻璃球，是不是時間長了，上面附著了一些有機物，導致反應不靈敏；</span></p><p><span style="font-family:calibri; font-size:16px"> </span></p><p> </p> </div> <div id="sq82xwe7wu" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/jsshengaohua-News-877338/">6月“盛奧華”儀器應用案例大集錦</a></li> <li>下一篇：<a href="/jsshengaohua-News-870206/">又是一年高考季，“盛奧華”與考生們一起努力、加油！</a></li> </ul> </div> </div>   <div id="sq82xwe7wu" class="foot_box"> 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