US EPA

1344198 

Journal Article 

Leaching of copper, chromium, and arsenic through some free-draining New Zealand soils 

Carey, PL; Mclaren, RG; Cameron, KC; Sedcole, , JR 

1996 

Yes 

Australian Journal of Soil Research
ISSN: 0004-9573
EISSN: 1446-568X 

BIOSIS/96/28080 

34 

4 

583-597 

eng 

WOS:A1996UX86400010 

BIOSIS COPYRIGHT: BIOL ABS. Concentrated toxic solutions of copper, chromium, and arsenic (CCA) are used extensively in the New Zealand timber preservation industry. A 2% w/v solution containing cupric, dichromate, and arsenate ions was leached through undisturbed soil monolith lysimeters containing the surface and subsurface horizons of 2 free-draining New Zealand soils. The resulting breakthrough curves were successfully modelled using the Gompertz equation for biomass growth. Differences between soil horizons in the fitted Gompertz parameter values were related to differences in soil physical and chemical properties affecting leaching. Results were compared to those from a previous study investigating pulse leaching of a concentrated CCA solution of similar ion ratio using the same soils. Generally, solution leaching produced breakthrough curves influenced more by the soil's physical structure and less by kinetic processes (i.e. sorption and diffusion). This was in part due to the high metal co 

heavy metals; dichromate; leaching model; lysimeter