Question

The micro-electrode is enclosed in a water jacket with circulating water at a constant temperature of ___________ °C for determination of pH.

(a) 25

(b) 34

(c) 38

(d) 42

The question was posed to me in an international level competition.

This is a very interesting question from Spirometry topic in division Pulmonary Function Analysers of Biomedical Instrumentation

Answer 1

Right option is (c) 38

Easiest explanation: A micro-electrode for clinical applications requires only 20–25 ml of capillary blood for the determination of pH. The electrode is enclosed in a water jacket with circulating water at a constant temperature of 38°C. The water contains 1% NACI for shielding against static interference.