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Preserva Lab

pH Meter

Preserva Wellness laboratory has a pH meter which is an instrument used to measure the pH level of a liquid. pH is the unit of measure that describes the degree of acidity or alkalinity.
It is measured on a scale of 0 to 14. The solution is said to be acidic if its pH level is between 0-7, neutral if it is 7 and alkaline or basic if it is over 7. At the time of making any solution or testing the juices, its pH level is checked to ensure there is no clash with the other substances to be added to the finished products.

The quantitative information provided by the pH value expresses the degree of the activity of an acid or base in terms of hydrogen ion activity. The pH value of a substance is directly related to the ratio of the hydrogen ion [H+] and the hydroxyl ion [OH-] concentrations. If the H+ concentration is greater than OH-, the material is acidic; i.e., the pH value is less than 7. If the OH- concentration is greater than H+, the material is basic, with a pH value greater than 7. If equal amounts of H+ and OH- ions are present, the material is neutral, with a pH of 7. Acids and bases have free hydrogen and hydroxyl ions, respectively.


In small laboratories, this pH test is done by using strips or by titration but they are not accurate, therefore Preserva Wellness laboratory has invested in a good quality pH meter. It gives accurate results post calibration. This instrument is much better than other conventional methods of determining the pH.



The benefit of using a pH meter to measure the acidity of a solution is that it is a lot simpler to use than using test strips or completing a titration experiment. Test strips and titrations both use a colour indicator; some people may perceive a different colour than the result. A meter will have a few buttons to operate the machine, and gives a result immediately. The result can be given on a digital display, which will provide a more precise result than a test strip and are able to measure down to the 0.01th of pH unit. There are pH test strips that cover ranges smaller than 0 to 14 which can give a more accurate level of detail than standard strips, but these are still not as accurate as a pH meter.

When the samples are being madefor any product, pH values are checked on a regular basis to ensure the levels of each substance being added to the solution remains in a pre-determined pH zone. For example, all Aloe Vera juices have a pH level below 7 since aloe vera by its nature is acidic and all other fruits, extracts and pulp added to it to make the juices are acidic.Therefore, the pH level of the finished product also has to be acidic.


Precautions while handling and storing the pH meter:

Wash the electrode and reference junction in purified water.
Do not leave the electrode dry; keep the electrode in storage medium.
Do not wipe the glass electrode bulb with any coarse material. Use only tissue paper.
Dissolve the salts deposits by immersing them in a container filled with some tap water for ten to fifteen minutes. Then thoroughly rinse with purified water.