Coals from Guizhou Province, Southwest China, attract many researchers’ attention for their high concentrations of hazardous trace elements, sulphur and mineral components. Trace elements in coals have diverse modes of occurrence that will greatly influe Coals from Guizhou Province, Southwest China, attract many researchers’ attention for their high concentrations of hazardous trace elements, sulfur and mineral components. Trace elements in coals have diverse modes of occurrence that will greatly influe