Extract absorbance at a given wavelength

Returns the absorbance value at a specified wavelength, reported in cm^-1. Optionally calculates specific absorbance (SUVA), reported in m^-1.

Usage

get_absorbance(abs, wl, cuvle = 1, suva = FALSE)

Arguments

abs

An `abs` or `abslist` object.

wl

A vector of absorbance wavelengths.

cuvle

Cuvette (path) length in cm.

suva

If `TRUE`, returns specific absorbance (SUVA).

Value

A vector of absorbance (or specific absorbance) values. If a value cannot be extracted, "DOC01" is returned.

Details

If metadata is not present, SUVA cannot be calculated and `NA` will be returned. To add metadata, use [add_metadata()].

If the wavelength requested is not in the absorbance data, it will be interpolated first using [abs_interp()].

Examples

abslist <- add_metadata(metadata, example_abs)

a254 <- get_absorbance(abslist, 254)
suva254 <- get_absorbance(abslist, 254, suva = TRUE)