Overview
Selenium (Se) is a nonmetal element in Group 16 of the periodic table, discovered in 1817 by Jöns Jacob Berzelius. It exists in several allotropic forms, including a gray metallic variant and a red amorphous powder. Selenium is a trace element essential for human health but toxic in excess. Industrially, selenium is primarily obtained as a byproduct of copper refining. Its unique photoconductive and semiconductor properties make it valuable in electronics, while its ability to decolorize glass led to its early use in glassmaking.
Physical and Chemical Properties
Gray selenium, the most stable form, exhibits metallic luster and conducts electricity when exposed to light—a property exploited in photocopiers and solar cells. The element reacts with oxygen to form selenium dioxide (SeO₂) and combines with metals to create selenides. Selenium's solubility varies by form: crystalline selenium is insoluble in water but dissolves in concentrated nitric acid, while some organic selenium compounds are water-soluble. Its compounds exist in oxidation states from -2 to +6, with +4 and +6 being most common in industrial applications.
Main Applications
In glass production, selenium compounds remove greenish tints from iron impurities and create ruby-red glass. The electronics industry uses selenium in photocopier drums, photovoltaic cells, and rectifiers due to its photoconductivity. Nutritionally, selenium is incorporated into animal feed and human supplements as sodium selenite or selenomethionine. Other uses include pigments (cadmium selenide), rubber vulcanization accelerators, and steel alloy additives to improve machinability.
Safety and Storage
Elemental selenium poses low toxicity, but its compounds (especially hydrogen selenide) are hazardous. Inhalation of selenium dust can cause respiratory irritation, while chronic exposure may lead to selenosis. Proper storage requires sealed containers in dry, well-ventilated areas away from oxidizers. Workers should use NIOSH-approved respirators for dust exposure and chemical-resistant gloves. Spills should be contained with inert absorbents and disposed of as hazardous waste according to local regulations.
B2B Procurement Guide
Industrial buyers should specify purity levels (typically 99.5%-99.99%), particle size for powders, and packaging requirements (e.g., 25 kg drums or bulk bags). Technical-grade selenium suffices for glass applications, while electronics demand high-purity material. Suppliers often price selenium based on market demand and copper production volumes, as most commercial selenium derives from copper refinery anode slimes. Establish long-term contracts to mitigate price volatility, and verify supplier certifications for heavy metal content compliance.
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