to_VPDB {isogeochem}

Converting isotope delta from VSMOW to VPDB

Description

to_VPDB() convert d18O value expressed on the VSMOW scale to the VPDB scale.

Usage

to_VPDB(d18O_VSMOW, eq = "IUPAC")

Arguments

d18O_VSMOW

d18O values expressed on the VSMOW scale (‰).

eq

Equation used for the conversion.

• "IUPAC" (default): the IUPAC recommended equation listed in Brand et al. (2014) and Kim et al. (2015).

• "Coplen83": the equation listed in Coplen et al. (1983) and the Hoefs book.

Details

The IUPAC recommended equation to convert between the scales is:

\delta^{18}O_{VPDB} = 0.97001 \times \delta^{18}O_{VSMOW} - 29.99

Value

Returns the d18O value expressed on the VPDB scale (‰).

References

References are listed at to_VSMOW().

See Also

to_VSMOW() converts d18O values expressed on the VPDB scale to the VSMOW scale.

Examples

to_VPDB(0)
to_VPDB(0, eq = "Coplen83")