PVP 90 9003-39-8

1.N-vinylpyrrolidone

Take 10.0g of this product (calculated as anhydrous), add 80ml of water to dissolve it, add lg of sodium acetate, precisely add 10ml of iodine titration solution (0.05mol/L), leave it for 10 minutes, and use sodium thiosulfate titration solution (O. 1mol/L) Titration. When it is near the end point, add 2ml of starch indicator solution, continue titration until the blue color disappears, and correct the result of the titration with a blank test. The consumption of iodine titrant (0.05mol/L) shall not exceed 3.6ml.

2.Moisture

Take this product and measure it according to the moisture determination method (General Rule 0832), and the moisture content shall not exceed 5.0%.

3.Residue on ignition

Take l.Og of this product and inspect according to law (General Rule 0841), and the remaining residue shall not exceed 0.1%.

4.Heavy metal

Take the residue left under the item of residue on ignition and inspect it according to law (General Rule 0821 Law 2), and the content of heavy metals shall not exceed 10 parts per million.

5.Nitrogen content

Take this product about 0.1g, accurately weigh it, place it in a Kjeldahl nitrogen bottle, add potassium sulfate log and 0.5g copper sulfate in sequence, slowly add 20ml sulfuric acid along the bottle wall, and place one at the mouth of the Kjeldahl nitrogen bottle In a small funnel, use a straight fire to slowly heat until the solution turns into a clear green, continue heating for 30 minutes, and let it cool. Transfer to a 100ml measuring flask, add water to dilute to the mark, and shake well. Precisely draw 10ml, measure according to the nitrogen determination method (General Principle 0704 Method 2), titrate the distillate with sulfuric acid titrant (0.005mol/L), and calibrate the titration result with a blank test. Calculated as anhydrous, the nitrogen content should be 11.5%~12.8%.

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