Method 1316 – Batch L/S
Liquid-Solid Partitioning (LSP) as a Function of Liquid-to-Solid Ratio for Constituents in Solid Materials Using a Parallel Batch Extraction Procedure
Summary:
This test provides the liquid-solid partitioning at the natural pH of the solid material as a function of liquid-to-solid ratio (L/S) under conditions that approach chemical equilibrium between the liquid and solid phases. This protocol consists of five parallel extractions of a particle-size reduced solid material (to facilitate the approach to equilibrium) in reagent water over a range of L/S values. The eluate concentrations at a low L/S provides insight into pore solution composition either in a granular bed or in the pore space of low-permeability material (e.g., solidified monolithic or compacted granular fill).
Detailed Description:
Method 1316 is used to determine the LSP between water and a solid material at equilibrium. This test is a parallel batch procedure with each extraction conducted at a different L/S. This equilibrium test is conducted on a granular sample of material such that particle-size reduction may be required to faciliate equilibrium.
A known mass of solid material is placed in each of five extraction vessels and deionized water is added at L/S of 10, 5, 2, 1, and 0.5 mL/g-dry. The vessels are tumbled in an end-over-end fashion for a contant time based on the maximum particle-size and designed to allow the extraction to obtain equilibrium. Eluates pH, conductivity are recorded and analytical samples are filtered and preserved for chemical analysis.
The output parameters of Method 1316 (pH, conductivity, constituent concentrations, cumulative mass release) are represented as a function of L/S. The results of this test are used to show changes in equilibrium concentrations as L/S approach that of field conditions and to estimate porewater concentrations at low L/S.
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