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Evaluation in accordance with the DIN EN ISO 17895 test method (determination of the in-can VOC content in water-soluble emulsion paints）

Posted Date:2025/7/8 1

Evaluation

Evaluate the chromatogram by integrating all the peaks to obtain their sum up to the retention time of tetradecane.

In determining the peaks, the signal/noise ratio may be at least 5:1 for the peak to be included in the integration.

The accuracy of the determination in the standard addition method is substantially affected by the precision with which the samples are weighed into the vials, To avoid losses due to premature evaporation, it is essential to work quickly, For this reason, sample masses of 15 mg can only be reproduced approximately in practice, and it is therefore desirable to normalize the peak areas of each analysis to 1 mg by dividing them by the actual sample mass and using Formula (1):

where

A_norm is the area normalized to 1 mg of sample, in area units/milligram,

A is the integrated area, in area units, determined up to and including the retention time of the marker compound;

m_vd is the mass, in milligrams, of the test sample (EP-0-1 to EP-A40-3, see Figure 1);

m_p is the mass, in grams, of the original sample of emulsion paint (EP);

m_cb is the mass, in grams, of citrate buffer added to the original sample.