Before using the electrode rinse with water and then soaked in naphtha. After each measurement electrode should wash naphtha before continuing measurements.
Using the solution's high to measure low salt concentrations and vice versa because of low world will have many confounding factors make measuring results not exactly.
When the sampling should be shaken well and form completely dissolved in the solvent. If not tan residue remaining in the sample measurement results will be inaccurate because not yet dissolved salt.
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