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MODELLING THE MIGRATION FROM PVC-U PIPES INTO DRINKING WATER

 

C. Losher and P.V. Mercea

# 2021 Amsterdam

In the framework of the German Environmental Agency (UBA) requirements of plastic articles in contact with drinking water (KTW-BWGL-guideline), the compliance is verified by comparing so-called “expected concentrations at tap”, C tap , of substances contained in the plastics with specific limits in drinking water (so- called MTC tap ’s). In practice, C tap ’s are obtained by analytical determination of the substance concentrations, C W ’s, in water at the end of a number of migration periods. However, this procedure is often a challenging, time and costs intensive task. This is especially true for materials like PVC-u, where the migration levels are, in most case, far below the detection limits of the most modern analytical methods. For such situations, an UBA Guideline recommends the use of migration modelling for the estimations of C W ’s. To perform such calculations a series of input parameters are needed, among them the diffusion and partition coefficients, D P ’s and K PW ’s, of the migrating substances are the most challenging ones. In recent years FABES Forschungs-GmbH, by investigating migration of substances from a series of polyolefins into water, has developed methods which allow the estimation + ’s, for compliance migration calculations for any of “conservative” D P+ ’s and K PW organic additive found in these polymers. In this presentation these results are presented in a very concise manner. Moreover, the extension of these results for a series of substances migrating from PVC-u samples in drinking water will be also presented. Eventually it will be shown how this information was implemented in a special software MIGRAPipe-KTW with which migration estimations as stipulated in the KTW-BWGL-guideline can be performed.

Related keywords : Diffusion, Migration, Partition, Migration modelling, PVC-u, Drinking water..
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