eem_coble_peaks | R Documentation |
Extract fluorescence peaks
eem_coble_peaks(eem, verbose = TRUE)
eem |
An object of class |
verbose |
Logical determining if additional messages should be printed. |
According to Coble (1996), peaks are defined as follow:
Peak B: ex = 275 nm, em = 310 nm
Peak T: ex = 275 nm, em = 340 nm
Peak A: ex = 260 nm, em = 380:460 nm
Peak M: ex = 312 nm, em = 380:420 nm
peak C: ex = 350 nm, em = 420:480 nm
Given that peaks A, M and C are not defined at fix emission wavelength, the maximum fluorescence value in the region is extracted.
An object of class eemlist
.
A data frame containing peaks B, T, A, M and C for each eem. See details for more information.
Different excitation and emission wavelengths are often used to measure
EEMs. Hence, it is possible to have mismatchs between measured wavelengths
and wavelengths used to calculate specific metrics. In these
circumstances, EEMs are interpolated using the
interp2
function from the parcma
library. A
message warning the user will be prompted if data interpolation is
performed.
Coble, P. G. (1996). Characterization of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy. Marine Chemistry, 51(4), 325-346.
\Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/0304-4203(95)00062-3")}interp2
file <- system.file("extdata/cary/scans_day_1/", "sample1.csv", package = "eemR")
eem <- eem_read(file, import_function = "cary")
eem_coble_peaks(eem)
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