Water and wastewater operators and laboratory technicians who measure pH for compliance and process control may encounter occasional problems that require troubleshooting. A few simple guidelines can help in resolving these problems quickly and in performing pH analyses with reliable results.Troubleshooting a pH problem means looking at various aspects of the procedure to identify the cause. First and foremost, make sure the calibration buffers have not expired and replace them if they have.Second, it is best to calibrate with buffers poured fresh daily or at least weekly; buffers that are reused for extended periods, especially if kept uncovered, can become
