Precautions for the use of ph tester
Before use, under normal circumstances, the pH meter should be calibrated once a day when it is used continuously, usually within 24 hours, and the instrument does not need to be recalibrated. The calibrated buffer solution is usually a pH 6.86 solution for the first time and a buffer close to the pH of the measurement solution for the second time. For example, if the assayed solution is alkaline, pH 9, choose 18 buffer, the water used to make pH 6.86 and pH 9.18 buffers should be boiled for 15 to 30 minutes in advance to remove dissolved carbon dioxide, during cooling To avoid contact with air, in order to prevent carbon dioxide pollution.
