Arsenic cycle

(FeAsS) and tennantite. The principal problematic mineral-sourced arsenic comes from smelting of ores that contain traces of arsenic. Sedimentary rocks bearing coal and shale may also contain high As. Major fluxes of As from the lithosphere to the atmosphere are volcanic emissions. Major sinks include sedimentation and subduction. As is also present in many industrial and agricultural sources such as herbicides, fertilizers, and pesticides. Some As is emitted from steel and glass production, and forest and grassland burning. Major locations that contribute significantly to As pollution are South Asia, West-central Africa, Western Europe, and Latin America. == Arsenic toxicity ==