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Compute the ionic ratio

Source: R/misc_chem.R
calculate_ir.Rd

Calculate the ionic ratio of a water sample based on the output of get_chem and add it to the input data as a new column ir.

Usage

calculate_ir(data)

Arguments

data

Output of the get_chem function (hydrochemical data retrieved from Watina) or any dataset with at least the columns loc_code, chem_variable (with at least concentrations for Ca and Cl), value, unit and date. It can be a lazy object as well as a local object (get_chem(collect = TRUE)).

Value

A tibble similar to the input data but with an extra column ir with the calculated ionic ratio.

Details

Depending on the units of the Ca and Cl concentrations, the ionic ratio gets calculated as follows:

  1. if the Ca and Cl concentrations are in meq/l: ionic ratio = [Ca2+] / ([Ca2+] + [Cl-])

  2. if the Ca and Cl concentrations are in mg/l: ionic ratio = ((Ca_mg*2)/40.078) / (((Ca_mg*2)/40.078) + (Cl_mg/35.453))

The result is the ionic ratio ir without units (0-1).

Examples

if (FALSE) { # \dontrun{
watina <- connect_watina()

# get the chemical data
mydata <-
  get_locs(watina, area_codes = "ZWA") %>%
  get_chem(watina, "1/1/2019") %>%
  collect()

# compute ionic ratio and add as new field
mydata_with_ir <- calculate_ir(mydata)
} # }