Capillary electrophoresis uantitative analytical method for impurities content in refined p-phthalic acid
A technology of purified terephthalic acid and capillary electrophoresis, which is applied in the direction of material analysis, analysis material, and measurement device by electromagnetic means, which can solve the requirements of instrument stability and sampling accuracy, the time-consuming external standard method, and the measurement accuracy. Not high problems, to achieve reliable quality control method, easy operation, good accuracy and repeatability
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[0033] 1. Accurately weigh 1.0000g of p-TOL and S, and place 0.1000g of 4-CBA and BA in a 100mL volumetric flask, add 14mL of ammonia solution to dissolve each, dilute to the mark with water and shake well.
[0034] 2. In five 50mL volumetric flasks, weigh 1.0000g of pure PTA, add 14mL of ammonia solution to dissolve it, then add different volumes of p-TOL, 4-CBA, BA and S, electrophoresis detection, according to p- TOL, 4-CBA, BA and S peak area ratio and mass ratio to calculate the respective relative correction factors, see the table:
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[0038] The calibration factor of the component has a certain linear relationship with the area ratio of the internal standard compound and the component, so the mass ratio of the component to the internal standard compound is the ordinate, and the peak area ratio of the component to the internal standard compound is the abscissa to draw the stan...
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