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Properties of Selenium. ▫ Atomic Number: 34. ▫ Group VI on the Periodic Table,
Chalcogen. ▫ Amorphous (red, black powdered), Monoclinic. Crystalline (red) ...
Selenium in Sediment and Soil
Jonathan Gillip Geochemistry
Properties of Selenium
Atomic Number: 34 Group VI on the Periodic Table, Chalcogen. Amorphous (red, black powdered), Monoclinic Crystalline (red), or Hexagonal Crystalline (metallic gray) Atomic Wieght: 78.96 g/mol Density: 4.79 g/cm3 Melting Point: 490.2 K Exhibits photovoltaic and photoconductive properties.
Properties of Selenium
Six stable isotopes. Nine major radioactive isotopes. Se-79 has a half-life of 65,000 years. Se-75 has a half-life of 120 days. All other halflives are less than 8 hours.
Stable Isotopes and Abundances Isotope
Abundance
Selenium-74
0.87%
Selenium-76
9.02%
Selenium-77
7.58%
Selenium-78
23.52%
Selenium-80
49.82%
Selenium-82
9.19%
Sources of Selenium in sediment and soil.
Parent Material of Soil or Sediment (Geologic). Atmospheric Anthropogenic
Concentrations of Se in Soils, Rocks, and Other Natural Sources. Material
Mean (mg/kg)
Igneous Rocks (general)
Range (mg/kg)
0.35
0.09-1.08
Volcanic Rocks, notable locations in USA CO, CA, NM, ID, AK
