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A standard titration solution is a highly accurate standard solution, and the concentration must be accurate to the fourth decimal place. Strict control and calibration of water quality, reagents, and instruments must be carried out during preparation or calibration. When calibrating the concentration of the standard titration solution, two people are required to conduct experiments, with each person conducting four parallel runs. The relative value of the extreme range of the four parallel runs measured by each person shall not exceed 0.15% of the relative value of the critical range of repeatability. The relative value of the extreme range of the eight parallel runs measured by two people shall not exceed 0.18% of the relative value of the critical range of repeatability. Take the average of the parallel measurement results of two people and eight people as the measurement result. During the calculation process, retain five significant digits, and take four significant digits for the concentration value report.
The concentration of the standard solution prepared in this standard refers to the concentration at 20 ℃. If there is a temperature difference during calibration and use, it should be corrected.
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