Calculates MEQ values for 'long' data in mg/L. Expects columns: "aqua_code" and "RESULT", where "aqua_code" is the parameter type (e.g., "Zn_diss") and RESULT is the numeric concentration in mg/L.
Arguments
- d
Data frame. Long data containing parameters and results
- drop_na
Logical. Whether to omit missing parameters
Details
For conversion details see the included data frame, meq_conversion.
Also see ?meq_conversion for a description of the data.
MEQs are calculated by dividing the parameter concentration in mg/L by the conversion factor.
Note: This is an internal function, exported for clarity in calculations
Examples
d <- data.frame(aqua_code = c("Cl", "HCO3"), RESULT = c(5.7, 38.3))
d
#> aqua_code RESULT
#> 1 Cl 5.7
#> 2 HCO3 38.3
meq(d, drop_na = TRUE)
#> # A tibble: 2 × 4
#> aqua_code RESULT UNIT aqua_unit
#> <chr> <dbl> <chr> <chr>
#> 1 Cl_meq 0.161 meq meq
#> 2 HCO3_meq 0.628 meq meq
meq(d)
#> # A tibble: 18 × 4
#> aqua_code RESULT UNIT aqua_unit
#> <chr> <dbl> <chr> <chr>
#> 1 Al_diss_meq NA meq meq
#> 2 CO3_meq NA meq meq
#> 3 Ca_meq NA meq meq
#> 4 Cl_meq 0.161 meq meq
#> 5 Cu_diss_meq NA meq meq
#> 6 F_meq NA meq meq
#> 7 Fe_diss_meq NA meq meq
#> 8 HCO3_meq 0.628 meq meq
#> 9 K_meq NA meq meq
#> 10 Meas_Alk_meq NA meq meq
#> 11 Mg_meq NA meq meq
#> 12 Mn_diss_meq NA meq meq
#> 13 NH4_meq NA meq meq
#> 14 NO2_meq NA meq meq
#> 15 NO3_meq NA meq meq
#> 16 Na_meq NA meq meq
#> 17 SO4_meq NA meq meq
#> 18 Zn_diss_meq NA meq meq