conv_o2: Convert between units of oxygen partial pressure and...

In respirometry: Tools for Conducting and Analyzing Respirometry Experiments

Convert between units of oxygen partial pressure and concentration

Description

Unfortunately, a consensus on the best way to express how much oxygen is in water has not been formed to date. Until then, this function converts between all commonly used forms of dissolved O2 measurements.

Usage

conv_o2(
  o2 = 100,
  from = "percent_a.s.",
  to = "all",
  temp = 25,
  sal = 35,
  atm_pres = 1013.25
)

Arguments

o2	a numeric vector of the O2 value(s). Default is 100.
from	a string describing the unit used to measure o2. Default is "percent_a.s." Options are: percent_a.s. (percent air saturation) percent_o2 hPa kPa torr mmHg inHg mg_per_l ug_per_l umol_per_l mmol_per_l ml_per_l mg_per_kg ug_per_kg umol_per_kg mmol_per_kg ml_per_kg volumes_percent
to	a single string either describing the unit to which the conversion should be conducted (options are the same as in from), or the string "all" to return all units.
temp	temperature (°C). Default is 25 °C.
sal	salinity (psu). Default is 35 psu.
atm_pres	atmospheric pressure (mbar). Default is 1013.25 mbar.

Details

Conversions are based on relationships and values from the package marelac which utilizes saturation values from Weiss 1970.

Author(s)

Matthew A. Birk, [e-mail]

References

Weiss R. 1970. The solubility of nitrogen, oxygen, and argon in water and seawater. Deep-Sea Research. 17:721-735.

Examples

conv_o2(o2 = 50)
conv_o2(o2 = 1:50, from = "umol_per_l", to = "ml_per_l", temp = 10, sal = 0,
	atm_pres = 1100)
conv_o2()[c('mmHg','kPa')]

respirometry documentation built on July 9, 2023, 5:30 p.m.