Αποτελέσματα Αναζήτησης
Acids pH/ mV Table Bases 355 +296 +237 +177 +118 +59 -118 -177 -237 -296 -355 414 0 0.0 Examples of Common pH z 7.0 100 11.0 12.0 13.0 14.0
When the temperature is 25 °C, the theoretical Nernst slope is 59.16 mV/pH unit. Thermo Scientific pH meters display the slope as a percentage of the theoretical value. For example, a
The Theory of pH Measurement. pH measurement has a wide variety of industrial applications in virtually every industry. These range from water conditioning to specific process related measurements to waste treatment.
To calculate the slope percentage of your pH probe: 1) Measure and record the mV value in pH 7.0 buffer; this is the electrode offset. 2) Measure the mV value in a second buffer, such as pH 4.0. 3) To determine the electrode slope, calculate the absolute mV difference in between the two buffers. 4) Divide this by the difference of pH units ...
The determination of pH is one of the most common process chemical measurements made today. This booklet explains the principles behind the measurement and discusses ways of avoiding common pitfalls. The booklet also discusses industrial ORP (oxidation-reduction potential) measurements.
A pH 4.01 buffer at 35 ºC is used during calibration and reads a mV value of 157.4. The displayed slope of the calibration is 95.3 %. The true value of pH 4.01 buffer at 35 ºC is 4.02.
This chapter, NFM A6.4, provides guidance and protocols for the measurement of pH of a water sample, which include the scientific basis of the measurement, selection and maintenance of equipment, calibration, proce-dures for measurement and reporting, and troubleshooting.
