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Model 1316 -Pre-Method
Method 1316 is used to determine the liquid-solid partitioning of inorganic constituents and non volatile organic constituents at the natural pH of the solid material as a function of liquid-to-solid ratio. The method entails placing a known mass of material in an extraction vessel, adding a prescribed volume of deionized water to the vessel, and then tumbling the sealed vessel end-over-end for a prescribed duration. Five parallel extractions are made. Each extraction is identical, with the exception of the volume of extraction fluid. The liquid-to-solid ratio varies from 0.5 to 10 mL/g dry material, including the moisture of the sample “as received”.
The particle size of solidified material is reduced to 5 mm or less to ensure that conditions approach liquid-solid equilibrium and that mass transport through large particles is minimized. The smaller the particles, the less the leaching duration. For example, when 85% of the particles are less than 5.0 mm, the contact time is 72 ± 2 hrs. When 85% of the particles are smaller than 0.3 mm, the contact time is 24 ± 2 hrs.
After tumbling for the prescribed duration, solids are separated from liquids through a combination of settling and filtration. The eluate’s pH, specific conductivity, and oxidation-reduction potential are determined within one hour after tumbling is completed. The remaining eluate is appropriately preserved and stored for chemical analyses. A liquid-solid partitioning curve is plotted for each constituent of concern and used to assess the efficacy of the stabilization process.
