1. Specifications

Product Name: Tetraethylammonium Chloride (TEACL)

 2. Determination

2.1 Determination of Assay

2.1.1 Reagents and solutions

a. Anhydrous Ethanol: Analytically pure

b. Calcium Carbonate: Analytically pure

c. Fluorescent Yellow: 1g/L Ethanol solution

d. Silver Nitrate standard solution: c(AgNO3) = 0.1mol/L

2.1.2 Analysis Steps 

Weigh 0.30g (accurate to 0.0002g) sample into 50mL Ethanol, add 25mL pure water, 0.1g Calcium Carbonate and 8 drops Fluorescent Yellow Ethanol solution. Titrate by 0.1mol/L AgNO3 standard solution. The solution turn to pink red, as the titration end point.

2.1.3 Result calculation

   Calculate the Assay X of Tetraethylammonium Chloride in sample according to following formula:

   In formula:

         V: The consumed volume of Silver Nitrate standard solution in titration, mL;

         c: Molar concentration of Silver Nitrate standard solution, mol/L;

         m: Mass of measured sample, g;

         165.70 - molar mass of Tetraethyl ammonium Chloride

2.1.4 Allowable difference

The difference between the two parallel determination results should not exceed 0.5%, taking the arithmetic mean as the determination result.

2.2 Determination of Free Amine

2.2.1 Reagents and solutions

Bromophenol blue indicator: 2g/L Ethanol solution

Hydrochloric acid(HCl) standard solution: 0.1mol/L aqueous solution

2.2.2 Testing of Free Amine

a) Weight 50mL Isopropanol into 250mL erlenmeyer flask, add 1mL Bromophenol blue indicator, titrate the solution by 0.1mol/L HCl standard solution, turn to yellow as titration end. No count.

b) Weigh around 5g (accurate to 0.001g) sample into 250mL erlenmeyer flask, add 50mL neutralized Isopropanol solution in step a. Stir solution to dissolve, can be heated if necessary. Titrate the solution by 0.1mol/L HCl standard solution, turn to yellow as titration end.

c) Result calculation

Calculate the content of Free Amine (Triehtylamine) X1% in sample according to following formula:

   In formula:

         V: The consumed volume of HCl standard solution in titration, mL;

         c: Molar concentration of HCl standard solution, mol/L;

         m: Mass of measured sample, g;

         165.70 - molar mass of Triehtylamine;

2.2.3 Allowable difference

The difference between the two parallel determination results should not exceed 0.05%, taking the arithmetic mean as the determination result.