Home > Blog > Content
Diethyl phthalate esters analysis
Feb 03, 2016

Color the cream amount, compared with the 1th, yellow color liquid, not more.

As Gas chromatographic method for the determination of related substances.

Chromatographic conditions and system suitability test to 5%-methyl phenyl polysiloxane as stationary phase of capillary column (30mx0.53mmx2.6mm or equivalent columns), column temperature 150 ℃, injection port temperature 225 ° c, detector temperature 225 ° c. B 1µl precision measuring solutions, injection gas chromatography, there should be no other peaks on the location of the internal standard peak appears. Control solution in diethyl phthalate peak and the internal standard peak separation shall not be less than 10.

Preparation of the internal standard solution takes naphthalene 300mg, add dichloromethane to dissolve and dilute to 100ml.

For the preparation of the test solution the cream 2.5G, precision, and methylene chloride to dissolve and dilute to 50ml, as the solution first, precision measuring solution ⑴ 2ml, home 100ml, volumetric, 2ml add internal standard solution, diluted with methylene chloride to the scale, as for the test solution.

Preparation of the reference solution ⑴ 2ml precision measuring solution, diluted with methylene chloride to 100ml, b as a solution, solution b precision measuring 1ml, 2ml add internal standard solution, diluted with methylene chloride to 100ml, as the reference solution.

Method for determination of precise measure for the test solution and the reference solution 1µl respectively injected gas chromatograph and record the chromatogram to 3 times times the retention time of peak. For the test solution if there are peaks in the chromatogram, the peaks area and the ratio of the internal standard peak area shall not be greater than the peak in the reference solution peak area ratio of the internal standard peak area (1%).

Water take the product, according to the moisture determination, water may not be too 0.2%.

Take the residue 10G, determined by law, legacy residues may not be too 0.1%