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Soil – Air And Sediment – Water Partition Coefficient

The soil matrix includes the following multicomponent such as

• Soil – air
• Soil – water
• Soil – solids

It also includes the soil that are contaminated with free phase of organic compounds or mixture of compounds or soil – organic carbon phase. The chemical concentration in soil is relative sum of all chemical concentration existing in all phases of soil. The soil matrix concentration Csm or mass balance of soil matrix is expressed as follows

Csm = Θsp Csp + ΘW CW + ΘA CA + Θorg Corg

Csm = mass of chemical/volume of soil

Where Θsp refers to fractional volume of soil particles

ΘW refers to fractional volume of soil – water

ΘA refers to fractional volume of soil – air

Θorg refers to fractional volume of soil – organic carbon

The soil matrix – air partition coefficient is expressed as follows.

Hsm/A = Csm/ CA

The Csm value is substituted in Hsm/A to get the following equation.

Hsm/A = (1- ε) Hsp/A + ΘW HW/A + ΘA + Θorg (1/HA/org)

where ε is porosity of soil. Soil porosity is referred as fractional volume of soil total void space to fractional volume of soil solids (1- ε).

Hsp/A is ratio of solid particles to air partition coefficient (Hsp/A = Csp/CA)

HA/org is air – organic phase partition coefficient (HA/org = CA/Corg)

The sediment – water partition coefficient can be expressed in the absence of free organic phase as follows

Hsed/W = (1- ΘW) Hsp/W + ΘW

in which, Hsed/W is assumed to impose no air inside sediment.

Questions:

• What is soil – air partition coefficient?
• What is sediment – water partition coefficient?
• What are applications of soil – air partition coefficient?
• What are applications of sediment – water partition coefficient?
• How to determine soil- air/ sediment – water partition coefficient?
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