Integrated Development Toolbox for Aquatic Chemical Model
Generation
Andreas F. Hofmann, Karline Soetaert, Filip J.R. Meysman,
Mathilde Hagens
Toolbox for the experimental aquatic chemist, focused on
acidification and CO2 air-water exchange. It contains all elements to
model the pH, the related CO2 air-water exchange, and
aquatic acid-base chemistry for an arbitrary marine,
estuarine or freshwater system. It contains a suite of tools for
sensitivity analysis, visualisation, modelling of chemical batches,
and can be used to build dynamic models of aquatic systems.
As from version 1.0-4, it also contains functions to calculate
the buffer factors.

Rigorous Data Reduction and Error Propagation of '40Ar/39Ar'
Data
person("Pieter", "Vermeesch", , "p.vermeesch@ucl.ac.uk", role = c("aut", "cre"))
Processes noble gas mass spectrometer data to determine the isotopic composition of argon (comprised of 36Ar, 37Ar, 38Ar, 39Ar and 40Ar) released from neutron-irradiated potassium-bearing minerals. Then uses these compositions to calculate precise and accurate geochronological ages for multiple samples as well as the covariances between them. Error propagation is done in matrix form, which jointly treats all samples and all isotopes simultaneously at every step of the data reduction process. The package includes methods for regression of the time-resolved mass spectrometer signals to t=0 ('time zero') for both single- and multi-collector instruments, blank correction, mass fractionation correction, detector intercalibration, decay corrections, interference corrections, interpolation of the irradiation parameter between neutron fluence monitors, and (weighted mean) age calculation. All operations are performed on the logs of the ratios between the different argon isotopes so as to properly treat them as 'compositional data', sensu Aitchison [1986, The Statistics of Compositional Data, Chapman and Hall].

Rigorous Data Reduction and Error Propagation of Ar40 / Ar39
Data
Processes noble gas mass spectrometer data to determine the isotopic composition of argon (comprised of Ar36, Ar37, Ar38, Ar39 and Ar40) released from neutron-irradiated potassium-bearing minerals. Then uses these compositions to calculate precise and accurate geochronological ages for multiple samples as well as the covariances between them. Error propagation is done in matrix form, which jointly treats all samples and all isotopes simultaneously at every step of the data reduction process. Includes methods for regression of the time-resolved mass spectrometer signals to t=0 ('time zero') for both single- and multi-collector instruments, blank correction, mass fractionation correction, detector intercalibration, decay corrections, interference corrections, interpolation of the irradiation parameter between neutron fluence monitors, and (weighted mean) age calculation. All operations are performed on the logs of the ratios between the different argon isotopes so as to properly treat them as 'compositional data', sensu Aitchison [1986, The Statistics of Compositional Data, Chapman and Hall].
utils, stats, methods, graphics, grDevices