PH meter is a commonly used instrument and equipment, which is mainly used to accurately measure the pH value of liquid medium. It can also measure the MV value of ion electrode potential with the corresponding ion selective electrode. It is widely used in industrial, agricultural, scientific research, environmental protection and other fields. . The instrument is also an essential inspection equipment in the food factory, drinking water factory QS, HACCP certification.
The pH meter should be calibrated periodically to make the precision and accuracy meet the requirements. How to calibrate the pH meter, or how to calibrate the pH meter. The following is the information compiled by the author. There are direct calibrations with the configured standard buffers, and some need to configure the standard buffers to recalibrate. Let's take a look at the two different preconditions and the same calibration method steps. For your reference friends.
Standard buffer (the standard buffer should be selected close to the pH of the test solution). There are currently 7 standard solutions. The following three solutions are generally used in China: (pH is at 25 ° C)
1) Potassium hydrogen phthalate (KHC8H4O4) 4.003pH; 0.05M
2) Mixed phosphate (Na2HPO4): mixed solution of potassium dihydrogen phosphate and disodium hydrogen phosphate 6.864 pH; 0.025M
3) Borax (Na2B4O7·l0H2O) 9.182 pH: 0.01M
The three standard buffers are configured as follows:1) pH4, potassium hydrogen phthalate standard buffer:
The potassium hydrogen phthalate [KHC8H4O4] 10.12g which was dried at 115 ± 5 ° C for 2 to 3 hours was accurately weighed, dissolved in water and diluted to 1000 ml.
2) pH 7, phosphate standard buffer (pH 7.4):
Accurately weighed 4.303 g of anhydrous sodium hydrogen phosphate and 1.179 g of potassium dihydrogen phosphate which were dried at 115 ± 5 ° C for 2 to 3 hours, dissolved in water and diluted to 1000 ml.
Additional supplement: phosphate standard buffer (pH 6.8) accurately weighed 3.533g of anhydrous sodium hydrogen phosphate and 3.387g of potassium dihydrogen phosphate dried at 115±5°C for 2～3 hours, dissolved in water and diluted to 1000ml .
3) pH9, borax standard buffer: Weigh accurately borax [Na2B4O7·10H2O] 3.80g (note: avoid weathering), add water to dissolve and dilute to 1000ml, place in polyethylene plastic bottle, close the plug, avoid carbon dioxide with air contact.
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