A sample object of class ir. The data set
contains ATR-MIR spectra for a set of organic reference materials
along with their metadata (types of samples and a description) and
accessory data (Klason lignin mass fraction and holocellulose mass fraction).
Format
A data frame with 58 rows and 7 variables:
- id_measurement
An integer vector with a unique id for each spectrum.
- id_sample
A character vector with a unique id for each sample.
- sample_type
A character vector containing class labels for the types of reference materials.
- sample_comment
A character vector containing comments to each sample.
- klason_lignin
A numeric vector with the mass fractions of Klason lignin in each sample.
- holocellulose
A numeric vector with the mass fractions of holocellulose in each sample.
- spectra
See
ir_new_ir().
Source
The data set was derived from https://www.nature.com/articles/s41467-018-06050-2 and published by Hodgkins et al. (2018) under the CC BY 4.0 license https://creativecommons.org/licenses/by/4.0/. Hodgkins et al. (2018) originally derived the data on Klason Lignin and Holocellulose content from De La Cruz, Florentino B. et al. (2016) .
References
De La Cruz, Florentino B., Osborne J, Barlaz MA (2016).
“Determination of Sources of Organic Matter in Solid Waste by Analysis of Phenolic Copper Oxide Oxidation Products of Lignin.”
Journal of Environmental Engineering, 142(2), 04015076.
ISSN 0733-9372, doi:10.1061/(ASCE)EE.1943-7870.0001038
.
Hodgkins SB, Richardson CJ, Dommain R, Wang H, Glaser PH, Verbeke B, Winkler BR, Cobb AR, Rich VI, Missilmani M, Flanagan N, Ho M, Hoyt AM, Harvey CF, Vining SR, Hough MA, Moore TR, Richard PJH, De La Cruz, Florentino B., Toufaily J, Hamdan R, Cooper WT, Chanton JP (2018).
“Tropical peatland carbon storage linked to global latitudinal trends in peat recalcitrance.”
Nature communications, 9(1), 3640.
doi:10.1038/s41467-018-06050-2
.