|
Laboratory Methods: Kinetic Geochemical Testing
When static tests cannot provide adequate information for prediction,
generally kinetic tests are performed. Kinetic tests can provide
a more accurate assessment of the strata's potential drainage quality.
They provide empirical data by subjecting overburden samples to
simulated weathering conditions, which may be designed to either
mimic or accelerate natural conditions. The rates of sulfide oxidation,
carbonate depletion, acid generation and metal leaching can then
be measured quantitatively to predict drainage quality (Bradhum
and Caruccio, 1995). Samples of the leachate are analyzed for
pH, specific conductance, acidity, alkalinity, sulfate, metals and
sometimes other constituents. Although, kinetic tests are more accurate,
they are generally avoided unless necessary because the tests typically
require 12-20 weeks, at a minimum, to complete. Accurately simulating
realistic weathering in the lab can also be troublesome.
For more information on kinetic testing, see the following websites:
Problem | Compliance
| Health & Safety | Sampling
| Analytical | Data
Quality
Site Assessment | Prediction
| Construction | GIS
| Monitoring & Assessment
|
