Surface water, groundwater, drinking water, and source water testing

1. Scope of Application 1.1 This method is applicable to the determination of p-value in drinking water, surface water, and industrial wastewater. 1. The color, turbidity, colloidal substances, oxidants, reducing agents, and higher salt content of water do not interfere with the measurement. However, in strongly acidic solutions with a pH less than 1, there may be so-called acid errors, which can be measured based on acidity. In alkaline solutions with a pH greater than 10, errors may occur due to the presence of a large amount of sodium ions, resulting in a low reading, commonly referred to as sodium difference. The method of eliminating sodium difference is to use a specially designed low sodium difference electrode, and to calibrate the instrument, a standard buffer solution similar to the pH value of the measured solution can also be used. Temperature affects the potential of the electrode and the ionization equilibrium of water. It is necessary to adjust the compensation device of the instrument to match the temperature of the solution, and ensure that the temperature error between the tested sample and the standard buffer solution used for calibration is within ± 1 ℃

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