pH Balancer’s pH level Testing Method

Each batch of pH Balancer upon arrival in Singapore have go through AVA comprehensive lab tests and will only be allowed to release for sales with the authority’s approval. We also constantly monitor the water quality by sending samples for independent lab tests which include measuring the water pH level. Products are tested by TUV & SGS.

Determining pH of packaged drinking water

  1. Introduction
    1. The pH value is the negative logarithm of the hydrogen ion concentration.
    2. If the potential difference between the glass electrode immersed in water and the reference electrode (usually a dry mercury electrode) is E, and the potential difference in the buffer solution with a certain pH at the same temperature is Es, then the pH of the water is:
      pH-pHs=(E-Es)/2.3026RT/F
      R=8.3144Joule/°C mol
      T=T°C+273.15°C
      F=96495Coul/gm.eq
    3. The alkaline ionized water of our factory is weakly alkaline (pH 8~9) because the electrical conductivity is extremely low (below 45μs/cm). When the pH is measured, it is easy to absorb carbon dioxide in the air to produce carbonic acid and lower the pH, and lose the true value of the sample.
  2. Equipment
    1. pH meter
    2. Glass electrode and reference electrode (usually a dry mercury electrode)
    3. Buffer solution
  3. Analysis method
    1. Connect the pH meter power supply.
    2. Wash the electrode with distilled water and blot it with absorbent cotton or absorbent
      paper.
    3. Adjust the pH meter with two pH buffers (requires the pH value principle).
    4. Determine the pH value of the water sample and measure the temperature change within ±1°C.
    5. When measuring the pH value of alkaline ionized water samples, immerse the
      electrode with sample water, wait for the near equilibrium to change the sample water, try not to stir the sample, avoid sample absorption of carbon dioxide that will lower the pH and lose the true value of the sample.
  4. Notes
    1. When determining the pH value, the results of three consecutive times shall comply with the reproducibility specifications specified by the pH meter.
    2. When the pH value is greater than the water sample 11, try to use a electrode with little alkaline error or the measured value to correct it.