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梅特勒ph計(jì)的維護(hù)保養(yǎng)要點(diǎn)介紹

發(fā)布日期: 2025-08-07
瀏覽人氣: 87
   梅特勒ph計(jì)作為測(cè)量溶液酸堿度的核心儀器,其準(zhǔn)確性直接關(guān)系到實(shí)驗(yàn)數(shù)據(jù)的可靠性與產(chǎn)品質(zhì)量的穩(wěn)定性。然而,長(zhǎng)時(shí)間使用后,電極老化、污染或校準(zhǔn)失效等問題會(huì)嚴(yán)重影響測(cè)量精度。因此,定期的維護(hù)與保養(yǎng)不僅能夠延長(zhǎng)使用壽命,更能確保每一次測(cè)量都精準(zhǔn)無誤。本文將為您詳細(xì)解析梅特勒ph計(jì)的維護(hù)保養(yǎng)要點(diǎn)。
 

 

  一、日常清潔與檢查
 
  1、電極清潔
 
  電極是敏感的部件,易受到污染物的影響。每次使用后,應(yīng)用蒸餾水或去離子水沖洗電極,去除附著的樣品殘留。若電極表面出現(xiàn)蛋白質(zhì)沉積或油脂污染,可使用專用清洗液(如0.1mol/L HCl或蛋白酶溶液)進(jìn)行浸泡清洗,隨后用清水沖洗干凈。
 
  2、檢查電極狀態(tài)
 
  定期觀察電極玻璃球泡是否完整,有無裂紋或氣泡。若發(fā)現(xiàn)電極響應(yīng)變慢或測(cè)量值漂移嚴(yán)重,可能是電極老化或內(nèi)部電解液干涸,需及時(shí)更換或補(bǔ)充電解液。
 
  二、定期校準(zhǔn)與標(biāo)定
 
  1、標(biāo)準(zhǔn)緩沖液選擇
 
  使用新配制的pH標(biāo)準(zhǔn)緩沖液進(jìn)行校準(zhǔn),常見的有pH 4.00、7.00和10.00三種。確保緩沖液未過期且儲(chǔ)存得當(dāng),避免污染。校準(zhǔn)頻率建議每天使用前進(jìn)行一次,或在測(cè)量高精度要求樣品前重新校準(zhǔn)。
 
  2、校準(zhǔn)操作規(guī)范
 
  按照說明書進(jìn)行兩點(diǎn)或三點(diǎn)校準(zhǔn),先低后高依次使用標(biāo)準(zhǔn)液。每次更換緩沖液前必須用去離子水沖洗電極,并用濾紙輕輕吸干表面水分。校準(zhǔn)完成后,記錄偏差值,若發(fā)現(xiàn)系統(tǒng)誤差較大,需排查電極性能或更換新電極。
 
  三、電極的保存與再生
 
  1、電極保存方法
 
  不使用時(shí),應(yīng)將pH電極浸泡在專用的電極保護(hù)液或3mol/L溶液中,防止玻璃膜干涸,保持電極活性。切勿將電極長(zhǎng)時(shí)間置于蒸餾水中,以免造成離子流失,影響測(cè)量穩(wěn)定性。
 
  2、電極再生處理
 
  對(duì)于老化或反應(yīng)遲鈍的電極,可嘗試進(jìn)行再生處理。將電極在稀鹽酸中短時(shí)間浸泡后,再用清水沖洗并重新校準(zhǔn)。若仍無法恢復(fù)性能,則應(yīng)更換新電極。
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