The two-point calibration for the pH electrode uses two buffers.Which of the following pH values are correct for these two buffers?
1)6.839
2)6.840
3)7.384
4)7.495

Question

Quizplus · Accepted Answer

The National Institute of Standards and Technology (NIST)and the International Federation of Clinical Chemistry (IFCC)have established standards for the calibration of blood gas electrodes.A one-point calibration uses a nearly normal pH buffer with a pH of 7.384.A second,lower pH buffer,pH 6.840 is analyzed in the two-point calibration to ensure that the electronic output of the electrode is linear over a wide range of pH levels.

The Two-Point Calibration for the PH Electrode Uses Two Buffers