Recommended Specifications for Analytical Reagent Chemicals Hydriodic Acid, Chloroform, Chromium and Potassium Sulfate, Cobalt Nitrate (Not Low in Nickel), Glycerol, 8-Hydroxyquinoline, Lead Carbonate, Manganese Sulfate, Mercury, Sodium Tungstate, Zinc Oxide

Abstract

Committee on Analytical Reagents, American Chemical Society VOL. 12, NO. 11 0.04 mg. of iron in the same volume of a solution containing the quantities of reagents used in the test. ChloroformNote. Chloroform should be supplied and stored in amber glass containers and protected from direct sunlight. RequirementsSpecific Gravity at 25°/25°C . 1.475 to 1.478.Nonvolatile Matter. Not more than 0.001 per cent. Acetone or Aldehyde. To pass test [limit about 0.005 per cent as (CHs^CO],Acid and Chloride. To pass test.Free Chlorine (Cl). To pass test. Substances Darkened by Sulfuric Acid. To pass test. TestsNonvolatile Matter. Evaporate 67 cc. (100 grams) on the steam bath and dry the residue at 105°to 110°C. for 0.5 hour.The weight of the residue should not exceed 0.0010 gram.Acetone or Aldehyde. Agitate 3 cc. with 10 cc. of ammoniafree distilled water in a glass-stoppered cylinder for 5 minutes. After the liquids separate, transfer 5 cc. of the water extract to another glass-stoppered cylinder containing 40 cc. of ammoniafree distilled water, and add 5 cc. of Nessler's solution. No turbidity nor precipitate should develop within 1 minute (aldehydes and ketones).Acid and Chloride. Shake 17 cc. with 25 cc. of water for 5 minutes, allow the liquids to separate, and draw off the water. 10 cc. should not redden blue litmus paper. Treat another 10 cc.