A new method of generation of gases at parts per million (ppm) levels for gas standards was developed. This method enables generation of many sorts of gases including SO2, NOx, (NO and NO2), H2S, HCN, and NH3 by a simple apparatus and simple operations. The rate of gas generation depends on pH, concentration, and temperature of the solution for gas generation, which contains a specific solute and buffer agents. This method possesses precision and.accuracy equal to those of the permeation tube, and the variation of the concentration of generated gas was less than 3%. Gases generated by this method can be utilized for calibration of the measuring instruments, biological and medical experiments, and studies on chemical reactions in ambient air.
ASJC Scopus subject areas
- Environmental Chemistry