一般情況下,電極常形成部分非均勻電場。此時,電極常數(shù)必須用標準溶液進行確定。標準溶液一般都使用KCl溶液這是因為KCl的電導(dǎo)率的不同的溫度和濃度情況下非常穩(wěn)定,準確。0.1mol/l的KCl溶液在25℃時電導(dǎo)率為12.88ms/cm。
所謂非均勻電場(也稱作雜散場,漏泄場)沒有常數(shù),而是與離子的種類和濃度有關(guān)。因此,一個純雜散場電極是最復(fù)雜的電極,它通過一次校準不能滿足寬的測量范圍的需要。
廈門市哲控工業(yè)設(shè)備有限公司
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