pbratios: Processing Pb isotope ratio data

#' Raw csv report with Pb isotope ratio data.
#'
#' This raw report was obtained saving as .csv the original .rep file produced by the mass
#' spectrometer Perkin Elmer ELAN ICP-MS.
#'
#' Field separator are "," and decimal separator are ".". Standards with known Pb isotope ratios are
#' used to correct the instrumental mass bias by the standard bracketing technique and are labelled
#' as \code{SRM}. QC data are BCR CRM 482 and are labelled as \code{CRM}. The dataset comprises PM10
#' samples collected from 2010 to 2014 at Ny-Ålensund (Svalbards, Norwegian Arctic).
#'
#' @name pm10nya-raw
#'
#' @format The file has 26988 rows and 7 columns.
#'
#' @author Andrea Bazzano and Marco Grotti.
#'
#' @source Processed data were published in Bazzano, Cappelletti, Udisti and Grotti, Long-range
#'   transport of atmospheric lead reaching Ny-Ålesund: Inter-annual and seasonal variations of
#'   potential source areas. Atmospheric Environment, 2016, 139, 11-19.
#'
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