permcoef: Calculates permeability coefficients
In transmem: Treatment of Membrane-Transport Data

Description Usage Arguments Details Value Author(s)

Permeability coefficients across a membrane as derived from integrated Fick's law can be obtained from transport data according to the equation

\ln{\Bigg(\frac{C}{C^0}\Bigg)}= -\frac{P~a}{V}t

where P is the permeability coefficient, a is the membrane exposed area, C and C^0 are the species concentrations at any time and at initial time in the feed phase, respectively, and V is solution volume.

1 2	permcoef(trans, vol, area, units = c("cm^3", "cm^2", "h"), conc0 = NULL, plot = FALSE)

`trans`	Data frame with the complete transport information of interest species. Must be generated using `conc2frac`.
`vol`	Volume of the feed solution.
`area`	Membrane exposed area to the feed solution.
`units`	Units in which volume, area and time are provided. Volume and area are function's parameters while the time is extracted from the `trans` data frame.
`conc0`	Initial concentration of the species in the feed solution. The value may be extracted from transport information if the data frame provided in `trans` is not normalized. See `conc2frac` for details.
`plot`	logical default to `TRUE`. Should the plot be made?

Species concentration units may be arbitrary as long as the permeability coefficient is calculated using the change in concentration ratio which is, as most ratios, adimensional

A numeric vector with the permeability coefficient and it's standard uncertainty from the regression. Units are meters per second.

Cristhian Paredes, craparedesca@unal.edu.co

Eduardo Rodriguez de San Miguel, erdsmg@unam.mx

transmem documentation built on July 1, 2020, 10:38 p.m.