How to calibrate the pH meter with the three-point method
Pro the kalibrace hotovo s 7.004.01, if the third point is needed, should I use the 9.21 buffer or 10.01, 9.18, 12.46, 1.68 and other buffers? How to determine?
1. In fact, the pH correction at the third point mainly depends on your sample conditions. As you said, there are many kinds of calibration solutions ranging from pH 1.68 to 12.46, and the appropriate calibration solution should be selected according to the final pH range of the sample. We commonly use 4.00, 6.86, 9.18. If your sample is more alkaline, you need 9.18, 10.01, 12.46. Calibration sequence is also different according to different instruments. Some require calibration in order, while others do not. The instrument will automatically recognize it. You need to refer to the relevant instrument manual.
2. Ne hmota co druh z pH metr% 2c bod z pH% 7b% 7b1% 7d% 7d musí být kalibrován, a bod z pH% 7b% 7b2% 7d% 7d musí být kalibrován první během vem dvoubodová kalibrace. Kdy dělání kalibrace, start from 7.0, a the selected standard solution is related to the pH value of the solution to be measured, so that the pH value of the solution can fall within the calibrated pH range. General, two points can be used to meet the requirements. If the requirements are very high, the third point should be considered. Some instruments can calibrate three points, and there is an optional mode, which can be used direct. For some that don't, two-point two-point proofreading is general used, that is, proofreading twice.
3. my obvykle použití kalibrace sekvence 7, 4, 10. check the acid first a then the base.
Pak pH metr has been idle for a long time, and the electrode is not placed in the protective solution, how to activate the electrode and calibrate it? What needs attention? How to prepare the standard calibration solution? What details should be paid attention to when using a pH meter?
