Batch equilibrim test methodology for estimating the retardation factor (Rd) using a hexachlorocyclohexane (HCH) solution

Abstract:

This paper presents part of a geo-environmental site investigation of a contaminated site, located in Santo André, State of São Paulo, Brazil. The adsorption capacity of the HCH (Hexachlorocyclohexane) isomers by the local natural soil, using the batch equilibrium test was studied. The batch equilibrium test method allows the construction of the adsorption isotherms, for estimating parameters, like the partition coefficient (Kd) and the retardation factor (Rd). The test methodology was consisted by three phases: elaboration of the pollutant solution; determination of the equilibrium time; and determination of the sorption isotherms. The preliminary results shown that the HCH isomers for the study site is less adsorbed by the soil than expected, presenting low Kd and Rd values. Also, the interpretation of these results can allow better understanding the behavior of the contamination plume and how each HCH isomer interacts with the physical environment.


Reference:
MACEDO, Letícia dos Santos; MANÉO, Fernanda Peixoto; MONDELLI, Giulliana. Bath equilibrium test methodology for estimating the retardation factor (Rd) using a hexachlorocyclohexane (HCH) solution. In: INTERNATIONAL CONFERENCE OF ENVIRONMENTAL GEOTECHNICS, 2013, Torino. Proceedings… ISSMGE

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