EA.adjust: Corrects raw d13C and 15N to vs. VPBD and air

In gholtgrieve/HEEL: Miscellaneous Functions From HEEL Members

Corrects raw d13C and 15N to vs. VPBD and air

Description

This function takes the raw d13C and d15N from IsoDat software and corrects them to VPDB and air, respectively, based on the working standards from the run. Two-point calibration curves are generated based on measured and known values of the working standards; this calibration is then applied to both the samples and standards. The function also calculates the percent C and N of samples and standards in a similar fashion using known mass C and N in the glutamic acid standard (GA1) and peak area (masses 44 and 28).

Usage

EA.adjust(results)

Arguments

results

List containing results from previous functions.

Value

List containing four dataframes:

standard.CN

Dataframe of raw data IsoDat data for the standards and QTY standards; updated to with new column for final corrected data.

sample.CN

Dataframe of raw data IsoDat data for the unknown samples form the sequence; updated to with new column for final corrected data.

calibration.coefficients

Dataframe of slope and intercept values used during data standardization.

measured.standard.means

Dataframe of average d13C and d15N of standards vs. tank and vs. international standards.

standard C & N data ($standard.CN), sample C & N data ($sample.CN), and calibration model coefficients ($calibration.coefficients).

Author(s)

Gordon W. Holtgrieve

gholtgrieve/HEEL documentation built on Nov. 20, 2023, 10:59 a.m.