Общие проблемы в использование из рН метр
1. Как к судить ли те pH композит электрод есть нормальный
Electrode potential: switch the gear of the instrument to the mV range, put the electrode into the standard buffer solution with pH{{0}}.86, the best value is around 0mV, and the maximum is within plus or minus 40mV. If it exceeds this range, the instrument will not be calibrated normally, and the calibration will be wrong.
6.86pH - 0mV plus or minus 40mV
9.18pH - around 120-130mV
4.00pH - around 170mV
2. Как часто делает the pH электрод нужно быть калибровано?
3. How to store the pH electrode?
When the electrode is not in use, it needs to be stored in 3mol/L potassium chloride solution (3M KCl);
4. How long is the life of the pH electrode?
Под нормальный использование и надлежащий обслуживание, the life of the pH electrode is 1 год.
5. When measuring pH, the sample temperature is 10 degree . Does the pH meter with automatic temperature compensation display the pH value at 10 degree or 25 degree ?
The pH meter показывает the pH value of the solution at the current temperature; if the sample temperature is 10 degree , the pH meter показывает the value of the solution at 10 градус . The температура компенсация of the acidity meter refers to compensating the influence of temperature on the pH electrode, but it cannot commissate the pH value at any temperature to 25 degree .
6. How long is the shelf life of pH buffer solution?
Как правило, , in the unopened state, the shelf life is 1 year. Once open and used, due to the action of various molds and carbon dioxide in the air, it is easy to wear. It is recommended to store the buffer solution in the fridge after opening, and it is recommended to store it for no more than one month.
7. Why can't the pH composite electrode be soaked in deionized water for a long time?
If the composite electrode is immersed in deionized water for a long time, the KCl концентрация inside the жидкость переход (такой как внутри песок сердцевина) будет будет сильно уменьшено, и the потенциал of the жидкость переход will увеличение, resulting in электрод нестабильность.
8. How to operate if the external reference solution of the pH electrode is polluted?
For rechargeable электроды, you can prepare a new KCl solution and add it in, pour it out after the first and second additions, so as to clean the inner cavity.
