The Making and Storage of PH Meter Standard Buffer Solution
1. The pH standard substance should be stored in a dry place. For example, the mixed phosphate pH standard substance will deliquesce when the air humidity is high. Once deliquescence occurs, the pH standard substance cannot be used.
2. Secondary distilled water or deionized water should be used to prepare pH standard solution. If it is used for 0.1 grade pH meter measurement, ordinary distilled water can be used.
⒊The prepared pH standard solution should be diluted with a smaller beaker to reduce the pH standard solution sticking to the beaker wall. In addition to emptying the plastic bags or other containers that store pH standard substances, they should also be rinsed with distilled water several times, and then poured into the prepared pH standard solution to ensure that the prepared pH standard solution is accurate.
4. The prepared standard buffer solution can generally be stored for 2-3 months. If turbidity, mold or precipitation are found, it cannot be used any longer.
5. Alkaline standard solution should be sealed and stored in polyethylene bottles. Prevent carbon dioxide from forming carbonic acid after entering the standard solution and lower its pH value.
