Selenium Standard Solution preparation:
Selenium Standard Solution (100 ppm Se):Dissolve 0.100 g of selenium in 2 mL of nitric acid. Evaporate to dryness. Take up the residue in 2 mL of water and evaporate to dryness; carry out three times. Dissolve the residue in 50 mL of dilute hydrochloric acid and dilute to 1000.0 mL with the same acid.
Selenium Standard Solution (1 ppm Se):
Immediately before use, dilute with water to 40 times its volume a solution containing selenious acid equivalent to 6.54 mg of H2SeO3 in 100.0 mL.
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