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id="3k2hsvbby" class="clear"></div> </form> </div> <div id="3k2hsvbby" class="clear"></div> </div> </div>   <div id="3k2hsvbby" class="ly_crumb"> <img src="/skins/270528/images/crumb_icon.png" /><p>當前位置：<a href="/">首頁</a> > <a href="/article.html">技術文章</a> > <span>ORP電極的校準和維護</span></p> </div>   <div id="3k2hsvbby" class="ly_NyNewsdetail"> <h1 class="NyNewsdetail_title">ORP電極的校準和維護</h1> <div id="3k2hsvbby" class="NyNewsdetail_tips">更新時間：2019-12-23 點擊次數(shù)：4205</div> <div id="3k2hsvbby" class="NyNewsdetail_con"> <p><span style="font-size:10.5000pt"><span style="font-family:宋體"> ① </span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">的清洗。電極用了一段時間需要清洗，特別是用于污水中的ORP電極易被H</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">2 </span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">S、HgCl</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">2</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">污染·因此如溶液中含有這些化合物，需要經(jīng)常對</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">進行清洗，甚至采用自動清洗裝置。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 用了一段時間，若<strong>傳感器</strong>工作不正常，可先檢查傳感器是否有機械性故障，如無，可用如下方法來清洗傳感器。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 首先用海綿蘸洗潔精對電極進行清洗，用清水漂洗后檢查傳感器是否能正常工作，如仍未奏效，把電極浸于稀鹽酸(5%)數(shù)分鐘后放于肥皂水中漂洗中和，再用清水沖洗。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 經(jīng)過上述處理，相當一部分有問題的電極可以恢復正常工作，有些電極可能用自動清洗系統(tǒng)，這種系統(tǒng)有一定效果，但對于污染嚴重的被測液其清洗效果不如手洗，有些電極可配超聲波清洗器，這種清洗器對硬度高的溶液去垢防結殼效果較好，對去除油脂性污染效果不很明顯。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> ② ORP電極的校準。氧化還原緩沖液是校準</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">隨時可用的標準溶液，ORP測量電極雖為金屬電極，其零點和斜率都不會有大的變化·但用緩沖液可發(fā)現(xiàn)微小故障，如電極表面被污染或參比電極零點偏移。 </span></span></p><p><strong><span style="font-size:10.5pt"><span style="font-family:宋體"> ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">采用氧化還原緩沖液進行校準，包括Fe</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體">2+</span></span></sup><span style="font-size:10.5000pt"><span style="font-family:宋體">/Fe</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體">3+</span></span></sup><span style="font-size:10.5000pt"><span style="font-family:宋體">的標準溶液，以及醌氫醌飽和酸性到中性的PH緩沖溶液。常見的是PH=4. 01的飽和醌氫醌緩沖溶液，其ORP應為265mV。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在實際測量時ORP值有時不正確，往往是電極表面被污染所造成，這時必須對ORP 極進行清洗，使之再生。在校準緩沖溶液中</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">測量ORP值不會產(chǎn)生差錯，若產(chǎn)生差錯則因參比電極或其隔膜有故障而引起，因此用ORP標準緩沖溶液校準時，以此來檢測ORP電極表面狀態(tài)是不適宜的。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 一般來說，用標準ORP校準緩沖液進行校準測量時，只限于檢查ORP電極組件系統(tǒng)單純功能。若ORP值超出允許范圍·可能原因如下：a.用錯參比電解質；b.因接地短路 (參比電極對地直流電阻至少是10M</span></span><span style="font-size:10.5000pt"><span style="font-family:times new roman">Ω</span></span><span style="font-size:10.5000pt"><span style="font-family:宋體">)使參比電極還原；c..參比電極隔膜被污染；d.ORP電極內部接觸不良。</span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 在校準時還應注意，氧化還原緩沖液可還原電極表面的鉑氧化膜，因此在用緩沖液檢查電極性能后，不能立即將鉑電極浸入強氧化性樣品液中，而應先用自來水沖洗后再放入待測樣品中測量。此外，還需注意的是用氧化還原緩沖液對</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP電極</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">進行性能檢查時。應在電極預處理以前進行。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> 對于pH/ORP測量系統(tǒng)而言，注意其共地問題，如有共地問題可采用隔離技術解決。此外，在安裝時需遵守基本規(guī)則：強電和弱電分開走線，強電和弱電避免用同一電源，這些對于pH值測量系統(tǒng)特別重要。因為pH傳感器是高陽抗輸出，易受干擾。 </span></span></p><p><span style="font-size:10.5000pt"><span style="font-family:宋體"> ③ </span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">ORP檢測儀</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">的調校方法。與</span></span><strong><span style="font-size:10.5pt"><span style="font-family:宋體">pH計</span></span></strong><span style="font-size:10.5000pt"><span style="font-family:宋體">的定量測量方法不同，ORP儀器測量的是一個比例量，也就是獲得水中的氧化性離子和還原性離子的比值[E=E</span></span><sup><span style="font-size:10.5000pt"><span style="font-family:宋體">0</span></span></sup><span style="font-size:10.5000pt"><span style="font-family:宋體">+F</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">k</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">*In(C</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">ox</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">/C</span></span><sub><span style="font-size:10.5000pt"><span style="font-family:宋體">red)</span></span></sub><span style="font-size:10.5000pt"><span style="font-family:宋體">]。因此，ORP的測量也就是一種測量溶液中的過氧化的方法，無論氧化劑是氯、碘、溴還是臭氧。ORP儀器的讀數(shù)是pH值的直接函數(shù)，因此ORP總是與pH值有關。</span></span></p> </div> <div id="3k2hsvbby" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/szhcy-Article-2074782/">化學需氧量（CODcr）水質在線自動監(jiān)測儀的術語和定義</a></li> <li>下一篇：<a href="/szhcy-Article-2072491/">水質化學需氧量的測定重鉻酸鹽法的步驟</a></li> </ul> </div> </div>   <div id="3k2hsvbby" class="foot_box"> <div id="3k2hsvbby" class="foot_t"> <div id="3k2hsvbby" class="w1200"> <a href="/">網(wǎng)站首頁</a>　|　<a href="/aboutus.html">關于我們</a>　|　<a 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