The role of laboratory and field leaching tests in hazard identification for solid materials.
The use of various in vitro toxicity assays for testing environmental solid samples is dependent on the availability of reliable methods for the sampling and pretreatment of the material. This study focuses on the evaluation of leaching behaviour as a first step in the context of the toxicity testing of solid environmental matter. Spent shale, from oil shale retorting, was chosen as a suitable example of deposited solid waste material. For the generation of leachate in the laboratory setting, a standard two-stage batch-leaching test was applied to the samples of technogenic waste. In the field, a new type of lysimeter, which does not disturb the surface, was used for in situ leachate collection. The chemical composition of water extracts was found to be different under field conditions, as compared with the laboratory experiments. Thus, the hazard identification of a solid technogenic waste by in vitro toxicological tests applied to laboratory leachates would not be the best solution. The content of hazardous ingredients could be underestimated if only laboratory tests are used. For risk assessment concerned with solid waste materials, the generation of leachate by using field lysimeters is recommended.
Kirso
Uuve
U
National Institute of Chemical Physics and Biophysics, Tallinn, Estonia. uuve@kbfi.ee
Irha
Natalya
N
Reinik
Janek
J
Urb
Gary
G
Laja
Margit
M
D004957:Estonia; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000009:adverse effects* / Q000032:analysis; D010578:Petroleum / Q000032:analysis / Q000633:toxicity; D010636:Phenols / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D012037:Refuse Disposal / Q000295:instrumentation*; D018570:Risk Assessment / Q000379:methods*; D012995:Solubility; D018675:Toxicity Tests; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
D007220:Industrial Waste; D010578:Petroleum; D010636:Phenols; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D014867:Water