Column percolation test for contaminated soils: Key factors for standardization.
Angelica Naka1, Tetsuo Yasutaka2, Hirofumi Sakanakura1
1National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Journal of Hazardous Materials
|August 28, 2016
Summary
Shortening column percolation tests for soil chemical leaching prediction is possible. Decreasing equilibration time and increasing flow rate can reduce test duration from 20-30 days to 7-9 days without compromising inorganic constituent release results.
Area of Science:
- Environmental Science
- Soil Science
- Analytical Chemistry
Background:
- Column percolation tests are valuable for predicting chemical leaching from soils.
- Current methods, like those in ISO/TS 21268-3, are time-consuming.
- Optimizing test parameters is crucial for efficient soil analysis.
Purpose of the Study:
- To evaluate the feasibility of reducing column percolation test duration.
- To investigate the impact of decreased equilibration time and increased flow rate on results.
- To compare inorganic constituent release under varied test conditions.
Main Methods:
- Column percolation tests were conducted on four soil types.
- Equilibration periods of 0, 12-16, and 48 hours were tested.
- Flow rates of 12 mL/h and 36 mL/h were applied, varying from ISO/TS 21268-3 standards.
Main Results:
- Similar inorganic constituent release values were observed for soils A and D across most conditions.
- Soil B showed no significant differences in release with varied parameters.
- Soil C exhibited inconsistent trends, potentially due to oxidation reactions.
Conclusions:
- Column percolation tests can be shortened to 7-9 days from 20-30 days.
- A reduced equilibration time of 12-16 hours and increased flow rate of 36 mL/h are feasible for inorganic substances.
- Optimized parameters offer a more efficient approach to soil leaching assessment.
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