seacarb (version 2.3.1)

Kf: Stability constant of hydrogen fluoride (mol/kg)

Description

Stability constant of hydrogen fluoride (mol/kg)

Usage

Kf(S = 35, T = 25, P = 0, kf = "pf", pHscale="T")

Arguments

S

Salinity, default is 35

T

Temperature in degrees Celsius, default is 25oC

P

Hydrostatic pressure in bar (surface = 0), default is 0

kf

"pf" for using Kf from Perez and Fraga (1987) and "dg" for using Kf from Dickson and Riley (1979), default is "pf"

pHscale

choice of pH scale: "T" for the total scale, "F" for the free scale and "SWS" for using the seawater scale, default is "T" (total scale)

Value

• Kf
  Stability constant of hydrogen fluoride (mol/kg)

encoding

latin1

Details

Note that the arguments can be given as a unique number or as vectors. If the lengths of the vectors are different, the longer vector is retained and only the first value of the other vectors is used. It can therefore be critical to use vectors of the same length. The Perez and Fraga (1987) constant is recommended by Guide to Best Practices for Ocean CO2 Measurements (2007). The Dickson and Riley (1979) constants is recommended by DOE (1994). The pressure correction was applied on the free scale. The formulation of Dickson and Riley (1979) provides Kf on the free scale but that of Perez and Fraga (1987) provides it on the total scale. Hence, in that case, Kf was first transformed from the total scale to the free scale. With both formulations, the pressure correction was applied as described by Millero (1995), and the value was transformed back to the required scale (T, F or SWS).

References

DOE 1994 Handbook of methods for the analysis of the various parameters of the carbon dioxide system in sea water. ORNL/CDIAC-74. Oak Ridge,Tenn.: Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory. Dickson, A. G. and Riley, J. P. 1979 The estimation of acid dissociation constants in seawater media from potentiometric titrations with strong base. I. The ionic product of water. Marine Chemistry 7, 89-99. Dickson A. G., Sabine C. L. and Christian J. R., 2007 Guide to best practices for ocean CO2 measurements. PICES Special Publication 3, 1-191. Millero F. J., 1995. Thermodynamics of the carbon dioxide system in the oceans. Geochimica Cosmochimica Acta 59: 661-677. Perez, F. F. and Fraga, F. 1987 Association constant of fluoride and hydrogen ions in seawater. Marine Chemistry 21, 161-168.

Examples

Kf(S=35,T=25,P=0,kf="pf",pHscale="T")