convert_conc: Convert between volume and mass concentrations

In Ostluft/rOstluft: Tools for handling air quality data by Ostluft

Convert between volume and mass concentrations

Description

This function converts between volume and mass concentration by standard conditions. The constants used are equivalent to the one used in AIRMO for sites below 1500m a.s.l:

R   = 8.314151     [kg * m2 / (s2 * mol * K)]
T   = 20.00        [°C]
p   = 1013.00      [hPa]

mol masses:
CO  = 28.01        [g / mol]
NO  = 30.01        [g / mol]
NO2 = 46.01        [g / mol]
O3  = 48.00        [g / mol]
SO2 = 64.06        [g / mol]

It is possible to change this constants via functions during run time for a session. See convert_set_R(), convert_set_mol_masses(), convert_set_conc_lookup()

Usage

convert_conc(data, parameter, from, to, method = "return", ...)

convert_conc_multiple(data, conversions, method = "return", ...)

Arguments

data	containing the parameter to convert
parameter	to convert
from	start unit
to	target unit
method	one of "return", "append", "replace". "return" only returns the converted data, "append" appends the converted data at the end, "replace" replaces the original data for the parameter with the converted
...	addional parameters passed to conversion function. see purrr::partial(), parts_to_mass(), mass_to_parts()
conversions	tibble with columns paramter, from, to. each row is a conversion

Value

converted data

See Also

• parts_to_mass()

• mass_to_parts()

• purrr::partial()

Examples

min30 <- system.file("extdata", "Zch_Stampfenbachstrasse_min30_2013_Jan.csv",
                     package = "rOstluft.data", mustWork = TRUE)

airmo_min30 <- read_airmo_csv(min30)
convert_conc(airmo_min30, "NO", "\u00b5g/m3", "ppb", method = "return")


conversions <- tibble::tribble(
  ~parameter, ~from, ~to,
  "CO", "ppm", "mg/m3",
  "NO", "ppb", "\u00b5g/m3",
  "O3", "ppb", "\u00b5g/m3",
  "NO2", "ppb", "\u00b5g/m3",
  "SO2", "ppb", "\u00b5g/m3"
)

min30 <- system.file("extdata", "Zch_Stampfenbachstrasse_min30_2013_Jan.csv",
                     package = "rOstluft.data", mustWork = TRUE)

airmo_min30 <- read_airmo_csv(min30)
airmo_min30_parts <- dplyr::filter(airmo_min30, .data$unit == "ppb" | .data$unit == "ppm")
convert_conc_multiple(airmo_min30_parts, conversions, method = "return")

Ostluft/rOstluft documentation built on Feb. 6, 2024, 1:26 a.m.