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What Is Span Adjustment (electric Potential Gradient Adjustment)? |
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Answer» ACTUALLY, the EMF per PH of a glass electrode is not ALWAYS equal to the value of 2.3026RT/F in the Nernst equation. Therefore, a pH meter requires compensation for small differences from the theoretical slope of potential, which can be done by adjustment using a pH 4 or pH 9 standard solutions. This is called SPAN adjustment. Actually, the emf per pH of a glass electrode is not always equal to the value of 2.3026RT/F in the Nernst equation. Therefore, a pH meter requires compensation for small differences from the theoretical slope of potential, which can be done by adjustment using a pH 4 or pH 9 standard solutions. This is called span adjustment. |
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