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7 Introduction · 7 Uses of Selenium 8 Availability and Production 8 Essential Nutrient Requirement and Toxicity 9 Abundance 9 Analytical Chemistry of Selenium 9 Fundamental Chemical Properties 10 Inorganic and Organic Species of Selenium 13 Selenide 13 · Elemental Selenium 13 Selenite 14 Selenate 14 Organoselenium 14 Occurrence 14 Crustal Rocks 14 Fossil Fuel 15 Marine Environment 15 Crustal Geochemical Cycle 16 Volcanoes 16 Atmosphere 17 Rivers 19 Oceans 19 Biogeochemistry 20 Selenium Weathering-Content and Behavior in Soil 21 U.S. Soils 21 Assimilation and Availability 22 Human Activities Leading to Selenium Release and their Amelioration 22 Unresolved Issues 23 Acknowledgments 24

Proceedings of the 1990 Billings land reclamation symposium on Selenium in arid and semiarid environments, Western United States