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Dongying Rich Chemical Co.,Ltd

Propylene Glycol Standard

Propylene Glycol Traits] This product is colorless to clarify the viscous liquid; odorless, slightly sweet taste;

This product and water, ethanol or chloroform can be any miscible.

Relative density The relative density of this product (Appendix Ⅵ A) should be 1.035 to 1.037 at 25 ° C.

【Identification】 (1) In the chromatogram recorded under the content determination, the retention time of the main peak of the test solution should be consistent with the retention time of the main peak of the reference solution.

(2) The infrared absorption spectrum of this product should be consistent with the control map (spectrum set 706).

[Check] acidity to take this product 10.0ml, add the new boiling cold water 50ml dissolved, add bromothymol blue indicator solution 3 drops, with sodium hydroxide titration solution (0.01mol / L) titration to the solution was blue, Consumption of sodium hydroxide titration solution (0.01mol / L) volume of not more than 0.5ml.

Chloride to take this product 1.0ml, according to the law (Appendix Ⅷ A), with the standard sodium chloride solution 7.0ml made of the control solution, not thicker (0.007%).

Propylene Glycol Sulfate to take this product 5.0ml, according to the law (Appendix Ⅷ B), with the standard potassium sulfate solution 3.0ml made of the control solution, not thicker (0.006%).

Propylene Glycol The relevant substances to take this product amount, accurately weighed, diluted with anhydrous hexanol made per 1ml of propylene glycol containing about 0.5g solution, as the test solution; another precision to take a diethylene glycol (diethylene glycol ), Dipropylene glycol, dipropylene glycol and propylene oxide reference products, diluted with absolute ethanol made per 1ml each containing about 5μg, 500μg, 150μg and 5μg of the solution, as the reference solution. According to the gas chromatography (Appendix Ⅴ E) test, polyethylene glycol 20M as the fixative, the initial temperature of 80 ℃, for 3 minutes, at a rate of 15 ℃ per minute temperature to 220 ℃, for 4 minutes, Temperature 230 ℃, the detector temperature of 250 ℃, the separation of the chromatographic peaks should meet the requirements. Precise amount of the test solution and the reference solution of each 1μl, into the gas chromatograph, record the chromatogram, according to the external standard method to calculate the peak area of the test sample of diethylene glycol (diethylene glycol) Propylene glycol, the amount of tripropanediol and propylene oxide. With diethylene glycol (diethylene glycol) shall not exceed 0.001%; a dipropylene glycol shall not exceed 0.1%; tri-propylene glycol shall not exceed 0.03%; propylene oxide shall not exceed 0.001%.

Oxidizing substances to take this product 5.0ml, set iodine bottle, add potassium iodide test solution 1.5ml and dilute sulfuric acid 2ml, dense plug, in the dark place for 15 minutes, add starch indicator solution 2ml, such as blue, with thio Sodium sulfate titration solution (0.005mol / L) titration to blue disappears, consumption of sodium thiosulfate titration solution (0.005mol / L) volume of not more than 0.2ml.

Reducing substances to take this product 1.0ml, add ammonia test solution 1ml, heated in 60 ℃ water bath for 5 minutes, the solution should not show yellow; quickly add silver nitrate test solution 0.15ml, shake, place for 5 minutes, the solution should be no change The

Propylene Glycol Moisture to take this product amount, according to water determination method (Appendix Ⅷ M first method A) determination, moisture content shall not exceed 0.2%.

Burning residue to take this product 50g, heated to burning, that is to stop heating, so that natural burning to dry, in the 700 ~ 800 ℃ burning to constant weight, leaving the residue not over 3.5mg.

Heavy metal to take this product 4.0ml, add water 19ml and acetate buffer (pH3.5) 2ml, mix, according to the law (Appendix Ⅷ H first method), containing heavy metals shall not be over five millionths.

Arsenic salt to take this product 1.0g, add hydrochloric acid 5ml and water 23ml, shake, according to inspection (Appendix Ⅷ J), should meet the requirements (0.0002%).


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