E517, Ammonium sulfate, Ammonia Sulfate, AMMNIUM SULPHATE, Diammonium Sulfate 7783-20-2

Ammonium sulfate, Ammonia Sulfate, AMMNIUM SULPHATE, Diammonium Sulfate 7783-20-2

CAS: 7783-20-2

Molecular Formula: H8N2O4S

Names and Identifiers

Physico-chemical Properties

Risk and Safety

Upstream Downstream Industry

Nature

colorless crystals or translucent orthogonal crystals or white particles. Soluble in water, insoluble in ethanol, acetone. It is decomposed into ammonia and sulfuric acid when heated to 28 °c. The relative density was 1. 77. 0.Imol/L aqueous solution pH 5.5. Reaction with sodium hypochlorite produces explosive nitrogen trichloride. By high heat decomposition, release of toxic smoke. Solubility in water (g/10g H20):70.6(0 °c);76.7(25 °c);103.8(100 °c). This product is non-flammable and irritating.

Preparation Method

ammonium sulfate was dissolved in cold water to a relative density of 1.20. An appropriate amount of ammonia water was added to adjust the pH value of the solution to 8-9, and the solution was allowed to stand, and the supernatant was extracted. A small amount of activated carbon was added to the supernatant, and the solution was heated and boiled, and kept at 60 °c. Additional aqueous ammonia was added to a pH of 9 to 10. Let stand and cool to room temperature. After filtration, the filtrate was evaporated to precipitate crystals and dried at 70 ° C. To obtain pure ammonium sulfate.

Standard

This product contains (NH4)2S04 should be 99.0% ~ 100.

 Trait

• This product is colorless or white crystals or granules.
• This product is soluble in water and insoluble in ethanol.

Introduction

Specific gravity 1.769. Decomposition at 235 ℃. Easily soluble in water, the aqueous solution is acidic, insoluble in ethanol and acetone. In humid air, it will absorb water and agglomate, and interact with alkalis to release ammonia.. When burning, it is decomposed into ammonia and sulfuric acid.

Use

for the separation of calcium and strontium and the preparation of microbial culture medium.

Differential diagnosis

This product of aqueous solution (1-20) ammonium salt and sulfate identification reaction (General 0301).

Safety

rat oral LDso:3000mg/kg. It has a stimulating effect on the eyes, skin, mucous membranes and upper respiratory tract. Staff should be protected. If the skin and eyes are touched, they should be immediately rinsed with flowing water. Products stored in a cool, ventilated warehouse to prevent moisture and rain. Keep away from fire and heat source. It should be stored separately from acids and alkalis, and mixed storage and transportation should not be avoided.

Exam

acidity

take this product l.Og, add water 20ml to dissolve, according to the law (General 0631),pH value should be 5.0~6.0.

chloride

take 2.0g of this product and check it according to law (General rule 0801). Compared with the control solution made of 0.0005% of standard sodium chloride solution, it should not be more concentrated ().

phosphate

take 4. 0g of this product, add 25ml of 0.5mol/L sulfuric acid solution to dissolve, add ammonium molybdate sulfuric acid solution (take 5g of ammonium molybdate, put it in a 100ml measuring flask, add 0.5mol/L sulfuric acid to dissolve and dilute to the scale, shake to obtain) and p-aminophenol sulfate solution (take p-aminophenol sulfate 0.2g, add water 100ml, add sodium bisulfite 20g, stir to dissolve, that's right. In a closed container, can be stored for 1 month) each lml, placed at room temperature for 2 hours, such as color, and standard phosphate solution (precision weighing 105C dry 2 hours of potassium dihydrogen phosphate 0.1433G, in a 1000ml measuring flask, add water to dissolve and dilute to the scale, and shake. Take 10ml, put it in a 100ml measuring flask, dilute it to the scale with water, and shake it well. Each lm l is equivalent to 10 meshes of P04)2 .0ml of the control solution prepared by the same method, and should not be deeper (0.0005%).

nitrate

take this product l. Add 10% vaporized potassium solution (0.4ml) and 0.1% diphenylamine sulfuric acid solution (0.1 ml) to the test tube, add water (5ml) to dissolve the solution, cool the solution in an ice bath, and slowly add sulfuric acid (5ml) dropwise, shake well, place the test tube in a water bath at 50°C for 15 minutes, and produce a solution of blue and standard nitrate [take potassium nitrate 0.163G, add water to dissolve and dilute to 100ml, shake well, accurately take lml, dilute to 100ml with water, shake well, then get (each lml is equivalent to 10f/gNO3)] 1.0, add 4ml of nitrate-free water, the color comparison after treatment with the same method shall not be deeper (0.001%).

insoluble in water

Take 20g of this product, put it in a beaker, add 200ml of water to dissolve it, and heat it on a water bath for 1 hour. While hot, the solution is filtered through a constant-weight G2 vertical melting funnel, and the beaker and funnel are washed with hot water and dried at 105°C to a constant weight. The remaining residue should not exceed 0.005%.

ignition residue

Take 20g of this product, check according to law (General 0841), residue shall not exceed 0.005%.

Iron Salt

take 0807g of this product, add water 40ml, hydrochloric acid 2ml, check according to law (General rule 0.0005%), compared with the control solution made of standard iron solution, not deeper ().

Content determination

take about 1.25g of this product, precision weighing, put it in a 250ml Erlenmeyer flask, add 50ml of water to dissolve, Precision Add 25ml of sodium hydroxide titration solution (lmol/L), put the glass funnel in the mouth of the bottle, boil for 15-20 minutes, until the ammonia in the solution completely escapes (make litmus test paper neutral), let it cool, add 3 drops of Thymol blue indicator solution, titrate with sulfuric acid titrant (0.5mol/L) and correct the results with a blank test. Each 1 ml sulfuric acid titration solution (0.5mol/L) is equivalent to 66.07mg (NH4 )2S04.

Category

pharmaceutical excipients, buffers.

Storage

sealed storage.

Reference Information