Sodium Iodide (NaI) CAS 7681-82-5 Assay ≥99.0% (Titration) Factory CP2010 Standard

This product is calculated on dry basis, containing NaI not less than 99.0%.
Properties: This product is colorless crystal or white crystalline powder; Odorless, salty, taste slightly bitter; hygroscopic; It turns brown in humid air.  
This product is very soluble in water and soluble in ethanol.
Identification: The aqueous solution of this product shows the identification reaction of sodium salt and iodide (Appendix III).
Alkalinity: Take 1.0g of this product, add 10ml of water to dissolve, add 1 drop of phenolphthalein indicator solution and 0.10ml of sulfuric acid titration solution (0.05mol/L), and do not show red.
CIarity and color of the solution: Take 1.0g of this product, add 10ml of water and dissolve, the solution should be clear and colorless; If the color is displayed, it shall not be deeper than the yellow No. 1 standard colorimetric solution (the first method in Appendix IX A).
Chloride: Take 0.25g of this product, add 100ml of water to dissolve, add 1ml of concentrated hydrogen peroxide solution and phosphoric acid, boil until the solution is colorless, cool, add 0.5ml concentrated hydrogen peroxide solution, boil, cool, transfer to 250ml measuring bottle, add water to the scale, shake well; Take 5.0ml, check according to law (Appendix Ⅷ A), and compare with the control solution made of standard sodium chloride solution 2.5ml, not more concentrated (0.5%).
Sulfate: Take 0.50g of this product, check according to law (Appendix Ⅷ B), and compare with the control solution made of standard potassium sulfate solution 2.0ml, not more concentrated (0.04%).
Iodate: Take 0.5g of this product, add 10ml of newly boiled cold water to dissolve, add 2 drops of dilute sulfuric acid and 0.2ml of starch indicator solution, and place away from light, do not show blue within 2 minutes.
Loss on drying: Take this product, dry at 105℃ for 4 hours, the weight loss shall not exceed 3.0% (Appendix Ⅷ L).
Potassium salt: Take 1.0g of this product, place it in a 100ml measuring bottle, dissolve it with water and dilute it to the scale, shake well; Take 4.0ml, add 1.0ml dilute acetic acid, mix well, add 5.0ml sodium tetraphenylborate solution (1→30), shake immediately and leave for 10 minutes; If turbidity occurs, it should not be more dense (0.05%) when compared with potassium chloride solution (take 9.5mg potassium chloride, add the right amount of water to dissolve and dilute into 1000ml) 4.0ml with the control solution prepared by the method.
Barium salt: Take 1.0g of this product, add 20ml of water to dissolve, filter, the filtrate is divided into two equal parts: one part with dilute sulfuric acid 1ml, the other part with water 1ml, within 15 minutes, the two liquids should be similarly clarified.
Heavy metals: Take 2.0g of this product, add 23ml of water to dissolve, add 2ml of acetate buffer (pH 3.5), check according to law (Appendix Ⅷ H first method), containing heavy metals shall not exceed 10 parts per million.
Content determination: Take about 0.3g of this product, weigh it accurately, dissolve it with 10ml water, add 35ml hydrochloric acid, titrate with potassium iodate titration solution (0.05mol/L) until yellow, add 5ml chloroform, continue titrating, and strongly shake until the color of chloroform layer disappears. Each 1ml of potassium iodate titration solution (0.05mol/L) is equivalent to 14.99mg NaI.
Category: Iodine supplements.
Storage: Dark, sealed storage.