K_H2PO4: K\_H2PO4

In AquaEnv: Integrated Development Toolbox for Aquatic Chemical Model Generation

Description

PUBLIC function: calculates the dissociation constant of H2PO4

Usage

K_H2PO4(S, t, p=0, SumH2SO4=NULL, SumHF=NULL, khf="dickson", khso4="dickson")

Arguments

S	salinity in practical salinity units (i.e. no unit)
t	temperature in degrees centigrade
p	gauge pressure (total pressure minus atmospheric pressure) in bars
SumH2SO4	total sulfate concentration in mol/kg-solution (calculated from S if not supplied)
SumHF	total fluoride concentration in mol/kg-solution (calculated from S if not supplied)
khf	S, t relation for K\_HF needed for scale conversion: either "dickson" (default, Dickson1979a) or "perez" (Perez1987a)
khso4	S, t relation for K\_HSO4 needed for scale conversion: either "dickson" (default, Dickson1990) or "khoo" (Khoo1977)

Value

the dissociation constant of H2PO4 in mol/kg-solution on the free proton pH scale

Author(s)

Andreas F. Hofmann. Maintained by Karline Soetaert ([e-mail]).

References

Millero1995 (original, SWS pH version), DOE1994 (in a later revision cites Millero1995)

Examples

K_H2PO4(35, 15)
K_H2PO4(35, 15, 10)
K_H2PO4(S=35, t=15, p=10, SumH2SO4=0.03)
plot(K_H2PO4(35, 1:25), xlab="temperature / degC")

Example output

[1] 7.634028e-07
attr(,"unit")
[1] "mol/kg-soln"
attr(,"pH scale")
[1] "free"
[1] 7.710811e-07
attr(,"unit")
[1] "mol/kg-soln"
attr(,"pH scale")
[1] "free"
[1] 7.634339e-07
attr(,"unit")
[1] "mol/kg-soln"
attr(,"pH scale")
[1] "free"

AquaEnv documentation built on May 2, 2019, 4:59 p.m.