Method 1314 – Percolation Column
Liquid-Solid Partitioning (LSP) as a Function of Liquid-to-Solid Ratio for Constituents in Solid Materials Using an Up-flow Percolation Column Procedure
Summary
This test is designed to provide the liquid-solid partitioning of constituents in a granular solid material as a function of liquid-to-solid ratio (L/S), based on elution volume, under percolation conditions. Granular material is moderately packed into a cylindrical glass column and is contacted by leaching solution at a low flowrate. Solution is introduced in an up-flow pumping mode to minimize air entrainment and flow channeling. Eluate concentrations and cumulative mass releases of constituents of potential concern are plotted as a function of cumulative L/S. Eluate concentrations may be compared to quality control and assessment limits for interpretation of method results.
Detailed Description:
Method 1314 is a percolation column test designed to obtain liquid-solid partitioning (LSP) information as a function of liquid-solid ratio (L/S). L/S is represented as the cumulative volume of leaching solution passing through a column containing a known mass of material. For some materials, particle size reduction may be required to meet column dimension requirements and facilitate the approach to equilibrium.
Solid material is loosely packed into a borosilicate glass column and contacted with a percolating leaching solution at low flowrate. Liquid is pumped in an up-flow direction to minimize channel and air entrapment. Eluates are collected at specific cumulative L/S values between L/S 0.2 and 10 mL/g-dry. Eluate concentrations and constituent cumulative release plotted as a function of L/S.
The results of Method 1314 provide an estimate of porewater concentrations at low L/S and illustrate how LSP changes as soluble constituents are released during succesive pore volumes.
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Overview Presentation of Method 1314