VERSITy

FEB 20114

UNI    

BT SOIL - 3

GAS – WATER EQUILIBRIUMAir

Water

absorption desorption

X(g)

X(aq)

GAS – WATER EQUILIBRIUMPM

FEB 20142 | 2010

Polarity & distribution coefficients

Gas (air)

Water (dissolved)

KH

Kd

Particles (sorbet)

GAS – WATER EQUILIBRIUMPM

FEB 2014

3 | 2010

POLARHydrophilicHigh water solubility

NON POLARHydrofobic (lipophilic)Low water solubility

Contact angle

Grease & oil

Charged subst (ions)

Soap /detergent

GAS – WATER EQUILIBRIUMPM

FEB 2014

LOTUS EFFECT

4 | 2010

GAS – WATER EQUILIBRIUMPM

FEB 20145

PHASE DISTRIBUTION

Koc and Kow relationship, From Curtis et al.

Kd = Cx,s/Cx,aq

Kd = KOC·fOC

(KOC = Kd/fOC)

KOW = Cx,oct/Cx,aq

GAS – WATER EQUILIBRIUMPM

FEB 2014

”ABDULS FORMULA”Calculation of Kd based on KOW and foc:

Log(Kd) = 1.04·log(KOW)+log(foc) – 0.84 Valid for log(KOW) < 5 and foc > 1 % Ref: Miljøstyrelsen (2002) Guidelines on Remediation of Contaminated Sites. (p248)

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GAS – WATER EQUILIBRIUMPM

FEB 2014

A BALLOON WITH ATMOSPHERIC AIR CONTAIN 20 PPM (VOL) CO2. THE AIR IS HEATED AND EXPANDS. AS CONSEQUENCE OF THE EXPANSION THE CO2 CONCENTRATION IN THE BALLOON:1. Increases 2. Is unchanged 3. Decreases 4. I don't know...

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CONCENTRATION

GAS – WATER EQUILIBRIUMPM

FEB 2014

THE BALLOON AGAIN: WHAT HAPPENS AS CONCEQUENCE OF THE EXPANSION WITH THE CO2 CONCENTRATIN IN MG/L ?1. It increases 2. It is unchanged 3. it decreases 4. I don't know

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GAS – WATER EQUILIBRIUMPM

FEB 20149

Substances Problem Sources

Heavy metals(Hg, Pb, Cd…)

Toxic & chronic effectsBio accumulation(strong sorption - Kd)

IndustryNon-point deposition: smoke, sludge and fertilizer

Mineral oil products(BTX, MTBE, PAH...)

Health. Taste + smell(indoor climate, water + skin contact)

Gasoline stations + tanks for oil heating

Chlorinated solvents(PCE, TCE..)

Cancer, toxicity.Bioaccumulation(indoor climate + water)

Dry cleaningMetal processingGraphic industry

PbCr

PCEBTX PAHThe Usual

Suspects…