Testing contaminant mobility in soils and waste materials.
Pollutant mobility in soils and waste materials is usually tested by standardized leaching procedures. In Germany, batch expts. are run for 24 h at a liq.:solid ratio of 10:1 (wt./wt.). While the mobility of metal(loid)s and hydrophilic org. compds. (e.g., phenols) can adequately be tested by automatic titrn. stands, working at const. pH values (e.g., pH 4 or 10), the mobility of hydrophobic org. chems. like polycyclic arom. hydrocarbons (PAH) or polychlorinated biphenyls (PCB) is more difficult to det. Natural solubilizing agents must be considered when testing mobility of hydrophobic org. chems. Several leaching expts. using natural and synthetic leaching solns. are presented. Exptl. results showed that sodium dodecyl sulfate (SDS) is a suitable ref. leaching soln. The solubilizing potential of SDS is comparable to one of the most potent natural leaching solns. (e.g., compost water), and thus represents a worst case. Future leaching tests of the environmental mobility of hydrophobic pollutants should incorporate the solubilizing effects of amphiphilic substances.
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