What should the reading be when the pH meter is stable?
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Drug testing can only be carried out once the pH meter is stable; so what should the reading be when it is stable? Is there a fixed value?
I don’t understand. Our company uses hashing; just marking the efficiency values is sufficient for a long time
If it is an aqueous solution with a very low solute concentration and high purity of water, the conductivity of such a solution will be low; the pH value will be unstable and difficult to maintain at a constant level. In this case, if adding a small amount of potassium chloride does not affect the measurement, the sample can be dissolved in a dilute potassium chloride solution for analysis. If the solute concentration is high and the solution has good electrical conductivity, resulting in unstable measurement values, it may be due to a poor grounding system of the instrument. Ensure that the instrument is properly grounded, and check whether the shielding layer of the electrode cable is intact. If the shielding of the electrode cable is damaged, it is recommended to replace the electrode cable or even the electrode itself.