2014-12-26TEST B SPOT TEST With sodium carbonate and sodium sulphide. 1. Use powdered mineral equal to two grains of rice. 2. Place in test tube with 8 drops of strong nitric acid. 3. Heat just to boiling. 4. Add 25 drops of a saturated solution of sodium carbonate. 5. Boil slightly and filter. Selenium is in the solution. 6.
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