Take this product, in 1 20 t dry to constant weight loss of weight shall not exceed 10.0% (General rule 0831). Take L O g of this product, add 20ml of water and 5ml of hydrochloric acid, boil for 5 minutes, filter, wash the filter residue with 10ml of hot water, combine the filtrate and lotion, add lm l of sulfuric acid, evaporate dry, the residue should not exceed 8mg. 0 0 5M o l/L sulfuric acid solution dissolved and quantitatively diluted into control solution containing 83ng quinine per lm l, according to UV-visible spectrophotometry (General Rule 0 4 0 1 ), the absorbance of the test solution should be less than that of the control solution at 365nm. The distillate was diluted to 100ml with cyclohexane, and used as a test solution. 0 G of the product was collected into a distillation flask, and 100ml of cyclohexane was added thereto, followed by distillation for 2 hours. O g, add 50ml of ethanol, boil and reflux for 10 minutes, immediately filter, dilute the filtrate with ethanol to 50ml, take 40ml of filtrate, and dry to constant weight, leaving residue not to pass 8 mg.ġ0. Hydrochloric acid test solution lm l was added, and the solution should not be blue. The absorption liquid is 2m l of sodium hydroxide test solution and 10ml of water, about 25ml distillate was distilled out, diluted with water to 50ml, added with 12 drops of ferrous sulfate test solution, heated to almost boiling, and allowed to cool.

Take 5 g of this product into a distillation flask, add 50ml of water and 2 g of tartaric acid, distill, and absorb the distillate with the absorption liquid placed in ice water bath. 5g of this product, add water 20 M l and hydrochloric acid 5ml, boil, steam can not wet lead acetate test paper black. 2 5G, Add 10ml of sodium hydroxide solution, boil, filter If the filtrate color, with the control solution (take 0.3ml gasification cobalt solution for color comparison, potassium dichromate solution 0 ,2 m l for color comparison, water 9-5ml mixed made) comparison, not deeper. Compared with the control solution made of 0M l, it should not be more concentrated (0. Take 20ml of the remaining filtrate under the pH item, check according to law (General Rule 0 8 0 2 ), and standard potassium sulfate solution 5. Compared with the control solution made of 0 M l, it should not be more concentrated (0. Take 10ml of the filtrate under pH, dilute it with water to 2 0 m l, and shake it well Take 20 m l for inspection according to law (General rule 0801), with standard sodium chloride solution 5. 5G, add water 50m l, boil for 5 minutes, let cool, filter, filter residue washed with water, combine filtrate and wash solution to make 50ml, the filtrate should be clear, encounter litmus test paper should be neutral reaction.

Carbon molar mass