Standardize the meter as described below. Rinse the electrodes and your sample cup with pure deionized water. Then titrate 100.0 ml of deionized water with your 0.16N acid as follows: Make sure your digital titrator is working and reset to zero. Add 10 digits of acid, record digits and pH, increase acid to 20 digits, record pH; repeat until you have added 100 digits of acid and stop. Send the results to us and we will send you a report. If you want to see the results yourself, try plotting the hydrogen ion concentration (H = 10(-pH)) vs. digits and see if the line is straight.
An optical pH sensor is mainly composed of a pH indicator and an organic carrier. Its principle of measurement is to utilize the acid-based indicator to mark the hydrogen ions in the solution [12]. The interaction between the indicator and the hydrogen ions changes the structure of the indicator molecule, varying the optical properties of the optical pH sensor (absorption rate, reflectance, fluorescence, refractive index, color, etc.). By measuring the variations in optical characteristics, the pH value of the solution can be determined. At present, the more commonly used indicator types are fluorescent acrylamide [13], thymol blue [14], cresol red [15], bromophenol blue [16], and chlorophenol red [17], and a new nanometer-based indicator is also under development. In general, the indicator should be immobilized on an organic carrier, such as a polymer, agarose, hydrogel, or cellulose, via methods including adsorption, chemical bonding, and the sol-gel method [18]. The carrier can then be fixed on the probe to form an optical pH sensor for sensing pH variation for long hours in a solution.
working principle of ph meter pdf free
After the meter has been turned on, allowed to stabilize as necessary and properly calibrated, begin by rinsing the probe with deionized or distilled water and blotting the probe dry with lint-free tissue paper.
pH Measurement specifies the degree of relative acidity or alkalinity of an aqueous solution at a given temperature. It is generally measured using a pH Meter. All living beings depend on a proper pH level to sustain life and hence pH Measurement becomes an important aspect of our lives. This post will discuss in detail about what is pH Measurement, its working principle, how it is measured, its applications, advantages and disadvantages. 2ff7e9595c
Kommentarer