Evaluation of batch and column techniques to measure weathering rates in soils.

摘要: Abstract Six batch and column techniques were evaluated with respect to their potential measure realistic weathering rates in soil. Soil samples taken from a C-horizon of Dystrochrept. Rates observed the laboratory one three orders magnitude higher than those inferred field studies. Batch that involve stirring or shaking, generally gave highest rates, probably due abrasion mineral particles. Column are be preferred, but classical leaching experiment chemical conditions pore water may vary considerably within over duration experiment. To reduce variation titration experiment, new technique was used, which influx protons automatically adjusted proportionally overall buffering rate. Results show dissolution for base cations aluminum strongly decrease extent reaction. Experimental evidence found an increase percolation rate will Although underlying mechanism relationship between is not yet clear, this explain important part discrepancy studies field.