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 measuring device by electromagnetic means, which can solve the problem of time-consuming external standard method, strict requirements for instrument stability and sampling accuracy, and measurement accuracy. Not high problems, to achieve the effect of easy operation, reliable quality control method, 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 respectively, 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 ...
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