convert_conc: Convert a value of the given concentration into another...

Description Usage Arguments Details Value See Also Examples

Description

A convenience wrapper around calc_factor_conc().

Usage

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convert_conc(x, from, to, molar_mass = 0, density_solute = 0,
  density_solution = 0)

Arguments

x

The value to convert.

from

A string containing the units of concentration A.

to

A string containing the units of concentration B.

molar_mass

The molar mass of the solute (g / mol).

density_solute

The density of the solute (g / l).

density_solution

The density of the solution (g / l), not the solvent!

Details

The following concentrations can be converted:

mass / volume: ".g / .l", ".g / .m^3", "% w / v"

molar / volume: ".M", ".mol / .l", ".mol / .m^3"

volume / volume: ".l/.l", ".l / m^3", ".m^3/.m^3", ".m^3 / .l", "% v / v", "v / v"

mass / mass: ".g / .g", "w / w", "% w / w"

Where "." symbolizes a metric prefix (see calc_factor_prefix()) :

For g, l, mol and M: d (deci), c (centi), m (milli), µ (micro), n (nano), p (pico) and f (femto).

For g you might use k (kilo) as well.

For m^3 (cubic metres) you may only use: d (deci), c (centi) and m (milli).

Note: % w / v is (incorrectly) taken as a short hand for 0.1 g / l.

Value

The converted value.

See Also

Other conversion functions: calc_factor_conc, calc_factor_prefix, convert_prefix

Examples

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library("dplyr")

# generate test data
data <- tibble(
  sample = c("A", "B", "C"),
  conc = c(4.5, 2.3, 5.1),       # concentration in g  / l
)

data %>%
  mutate(
    conc_ng_ml = convert_conc(x = conc, from = "g/l", to = "ng/ml"),
    # give molar mass in g / mol
    conc_mol_l = convert_conc(
      x = conc, from = "g/l", to = "M", molar_mass = 78.971),
    # give densities in g / l
    conc_pc = convert_conc(
      x = conc, from = "g/l", to = "%v/v", density_solute = 4810)
)

# throws an error
## Not run: 
# will throw an error because molar_mass is missing
fail <- convert_conc(x = 5, from = "g/l", to = "mol/l")

## End(Not run)

randomchars42/bioset documentation built on May 7, 2019, 9:43 p.m.