Wpływ temperatura na pH pomiar dokładność
For pH elektrody, the effect of temperature is {{0}}.00}3pH/ degree . example, a 0.2-grade elektroda is calibrated in a buffer solution of pH 7.{{1{1{19}}}} 7d at 30 degree , and then the solution at 60 degree is tested (zakładając that the pH range of the solution is at pH6 There is a difference between pH7.00 and pH7.00 by one pH unit), then the maximum error caused by temperature is 30 x 0.003=0.09pH. If it is 3 pH units (in the range of pH {18}}), the maximum error is 0.27pH, from which it can be seen that the temperature has a great influence on pH. Of course, we może również wyciągać wnioski od to. W porządku do zredukować błąd z temperatura do pH pomiar, my powinni zwracać uwagę to następni trzy punkty:
(a) Próbuj do wybierz a bufor roztwór zamknij do pH wartość z roztwor do być zmierzone do kalibrować pH metr.
(b) Spróbuj do make the temperature of the calibration solution the same or close to the temperature of the measured solution.
(c) A pH metr z temperatura kompensacja powinien być wybrany.
pH meters with an accuracy higher than {{0}}.1pH have temperature compensation adjustments, while pH meters with a grade of 0.2 do not have temperature compensation. Some 0.2-grade pH meters also claim to have 0.1-grade accuracy. In fact, this is impossible. Some people confuse the two concepts of resolution 0.lpH and precision 0.lpH. Even in terms of one pH unit, the pH error at a distance of 60 degree is 0.003 x 60=0.18pH. Therefore, the highest accuracy of a pH meter without temperature compensation is only 0.2pH
