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:
![ParBatchScheme Parallel Batch Test Diagram](https://www.vanderbilt.edu/leaching/wp-content/uploads/2010/12/ParBatchScheme-300x207.png)
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.
![LSResults Results of Method 1316 on several coal fly ash samples.](https://www.vanderbilt.edu/leaching/wp-content/uploads/2010/12/LSResults-300x264.png)
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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