Here below is the method of analysis for Cetyl trimethyl ammonium bromide shared by Ahsuperchem:
1. Reagents and Solutions:
Anhydrous Ethanol: Analytically pure
Calcium Carbonate: Analytically pure
Fluorescent Yellow Ethanol solution: 1g/L
Silver Nitrate standard solution: c(AgNO3) = 0.1mol/L
2. Analysis Steps:
2.1 Weigh 0.35g (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.
2.2 Result Calculation:
Calculate the Assay X% of Cetyl trimethyl ammonium bromide in sample according to following formula:
X％＝
V×c×364.46
m×10
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
364.46 - molar mass of CTAB
2.3 Allowable Difference
The difference between the two parallel determination results should not exceed 0.5%, taking the arithmetic mean as the determination result.
