Table 5.

The parameters used in the models of mercury recycling in the environment

Chemical properties	Elemental Hg		Inorganic Hg2+		MeHg+
Air/water partition coefficient K AW	0.117	Estimated by Clapeyron for Henry’s law constant at 25 °C	NAa	–	9.00 × 10−6c	Recommended literature value
Fraction absorbed on the skin	NRb	–	0	EA (2009)	0.1	EA (2009)
Diffusion coefficient in the air, m2/s	6.34 × 10−6	Estimated by the method according to Heinsohn and Cimbala (2003)	NA	–	8.61 × 10−6	Estimated by the FSG method
Diffusion coefficient in water, m2/s	2 × 10−9	Estimated by the method according to Hayduk and Laudie (1974)	NA	–	1.7	Recommended literature value
log Kow—octanol/water partition coefficient (log), dimensionless	0.62	Recommended literature value	NA	–	1.9	Estimated using a non-hydrophobic relation with the octanol/water partition coefficient log Kow
log Koc/w—organic carbon/water partition coefficient (log), cm3/g	4.16d	–	NA	–	251.1	Recommended literature value
Relative molar mass, g/mol	200.59	Recommended literature value	NA	–	NA	–
Soil/water partition coefficient, cm3/g	NA	–	500	Recommended literature value	1.13 (25 °C)	Recommended literature value
Vapor pressure, Pa	0.07028	Recommended literature value	NA	–	100 (21 °C)	Recommended literature value
Water solubility, mg/L	0.056 (25 °C)	Recommended literature value	74,000 (20 °C)	Recommended literature value	0.5	EA (2009)
Soil-to-dust transport factor	0.5	EA 2009	0.5	EA 2009	1	EA (2009)

^a NA not applicable; the models usually do not require these values for organic/inorganic compounds

^b NR not relevant

^cThe experimentally determined value of K _AW for the Cl⁻ ionic concentration of 0.2 × 10⁻³ mol

^dThe value estimated from the soil/water partition coefficient for the inorganic components of mercury with the organic carbon content of 0.0348 (equivalent to 6 % of SOM)