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Calculation of pO2 in Water Equilibrated with a Mixture of Room Air and Nitrogen

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Abstract

When gas A is dry air and mixed with an oxygen-free dry gas or gas mixture B (e.g., N2), then the \( {p_{{{\rm{O}}_{\rm{2}}}}} \) in water equilibrated with this gas mixture is

$$ {p_{{{\rm{O}}_{\rm{2}}}}} = {(_{\rm{b}}}p - {p_{{{\rm{H}}_2}}}{\rm{o,}}{T_{\rm{s}}}) \times {\phi _{\rm{A}}} \times \phi _{{{\rm{o}}_{\rm{2}}}}^*, $$
((1))

where bp is barometric pressure [kPa], \( {p_{{{\rm{H}}_{\rm{2}}}}}{\rm{o,}}{T_{\rm{s}}} \) is the saturation water vapor pressure at the temperature of the water sample, ΦA is the volume fraction of gas A in the gas mixture leaving the gas mixing pump,

$$ {\phi _{\rm{A}}} = {{{p_{\rm{A}}}} \over {_{\rm{b}}p}}{\rm{and1 - }}{\phi _{\rm{A}}} = {{{p_{\rm{B}}}} \over {_bp}}, $$
((2))

\( \phi _{{{\rm{o}}_{\rm{2}}}}^* \) is the volume fraction of oxygen in dry air which can be taken as constant \( \phi _{{{\rm{o}}_{\rm{2}}}}^* = 0.20946 \).

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© 1983 Springer-Verlag Berlin Heidelberg

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Gnaiger, E. (1983). Calculation of pO2 in Water Equilibrated with a Mixture of Room Air and Nitrogen. In: Gnaiger, E., Forstner, H. (eds) Polarographic Oxygen Sensors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81863-9_29

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  • DOI: https://doi.org/10.1007/978-3-642-81863-9_29

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-81865-3

  • Online ISBN: 978-3-642-81863-9

  • eBook Packages: Springer Book Archive