Only the inorganic selenium salts sodium selenite were available at a cost permitting their use in animal feed. Because selenium is an essential element, sodium selenite is an ingredient in some food supplements.
selenium can be toxic in high doses.
NOTE ::: Huge Differences between Sodium Selenite and Sodium Selenate ?
Sodium selenate is a common ingredient in some insecticides used against mites, aphids, and mealybugs. For most insects, a dose of 10 mg/kg is enough to be fatal. It is also used in some fungicides.
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