This standard specifies the method for determining the pH value of groundwater using the Glass electrode method, which is suitable for the determination of pH value in water samples such as groundwater resource investigation, evaluation, monitoring and utilization. In experiments, the pH value of the solution can be obtained by measuring the potential difference between the indicator electrode and the reference electrode in the solution to be tested. Although the safety measures mentioned in the standard are limited, the user needs to have experience in laboratory operation and ensure compliance with relevant regulations to ensure experimental safety and data accuracy.