pH12.46, etc., should be packed in a polyethylene bottle) with a tight cap. It should be stored at a low temperature (5-10°C) in the refrigerator. Generally, it can be used for about two months. If there is turbidity, mildew, or precipitation, it cannot be used. When using, you should prepare several 50ml polyethylene vials, pour the buffer solution in the large bottle into the vial, and place it at ambient temperature for 1 to 2 hours, and wait for the temperature to equilibrate before use. Do not pour back into the big bottle after use to avoid contamination. The buffer solution in the small bottle can be used for 2~3 days under environmental conditions of >10℃. Generally, the use time of the three solutions of pH7.00, pH6.86 and pH4.00 can be used. Longer, pH 9.18 and pH 10.01 solutions absorb CO2 in the air, and their pH values are relatively easy to change.
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