Assessment of the Mobility of Toxic Elements in Gold Mine Polluted Land - Column Leaching and Computer Modelling

摘要

Column leachmg experiments were designed and used as an alternative rapid screening approach to element mobility assessment for gold mine tailings at the Witwatersrand goldfield in South Africa. Layers from the tailings dump were packed into columns that were designed to allow extractionof leachates from each layer. Extracting solutions used were natural and acidified rainwater. Metals and anions were determined in the leachates. The chemical analytical data and physico-chemical data from field measurements were used for chemometric evaluation of element mobility with principal factor analysis. Results from the partitioned column leaching illustrate much better the complex processes of metals mobility from tailings dump than results from the total column. Kailings dumps;;column leaching;;ion mobility;;chemometrics