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Influence of solid-liquid separation method parameters employed in soil leaching tests on apparent metal
Yukari Imoto1, Tetsuo Yasutaka1, Masayuki Someya2
1National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan.
The Science of the Total Environment
|December 18, 2017
Summary
Batch leaching tests for heavy metals in soil are affected by solid-liquid separation. Optimizing centrifugal intensity and filtration volume is crucial for accurate metal leachability results.
Area of Science:
- Environmental Science
- Soil Science
- Analytical Chemistry
Background:
- Soil leaching tests are vital for assessing hazardous material mobility, particularly heavy metals.
- Batch leaching tests can increase colloidal mobility, necessitating effective solid-liquid separation.
- Standard methods rely on filtration, but results are sensitive to parameters like centrifugal force and filtration volume.
Purpose of the Study:
- To investigate the impact of centrifugal intensity and filtration volume on solid-liquid separation in batch leaching tests.
- To evaluate the influence of these parameters on the reproducibility and accuracy of heavy metal leachability assessments.
- To determine the role of colloidal particles in metal concentration measurements during soil leaching.
Main Methods:
- Conducted batch leaching experiments on metal-contaminated soils.
- Systematically varied centrifugal intensity (e.g., 3000 g for 2h or less) and filtration volume per filter.
- Compared filtration using 0.10 μm and 0.45 μm membrane filters.
- Analyzed filtrate turbidity and metal concentrations.
Main Results:
- Both centrifugal intensity and filtration volume per filter significantly impacted test reproducibility for certain soil types.
- Metal concentrations in filtrates varied notably with centrifugal intensity below 3000 g for 2h.
- Increased filtration volume led to decreased filtrate metal concentrations when filter cakes formed.
- Significant differences in turbidity and metal concentration were observed between 0.10 μm and 0.45 μm filters.
Conclusions:
- Inadequate removal of colloidal particles during solid-liquid separation can lead to overestimated metal concentrations in soil leaching tests.
- Centrifugal intensity and filtration volume are critical parameters that require careful optimization for reliable batch leaching results.
- The choice of membrane filter pore size influences the assessment of metal leachability, especially in soils with colloidal metals.
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