Guideline for the Mathematical Estimate of the Migration of Individual Substances from Organic Material in Drinking Water

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Umweltbundesamt für Mensch und Umwelt (Federal Environment Agency)

Introduction

The mathematical estimate of migration can be used in place of experimental proof to verify the requirements of KTW, Coating or Lubricant Guidelines for the migration of individual substances.
Organic material, such as plastics, which comes into contact with drinking water, can release substances into the water (mass transfer or migration). This lowers the concentration of substances in the organic material and increases it in water (mass transport). The stage that determines the speed of the mass transfer is the diffusion of the substance in organic material. The transfer of substances from organic material in drinking water can be measured in a laboratory (performance of the migration test and analysis of the test water on formulation-specific individual substances with a migration restriction) under standard conditions (surface-volume ratio, number of change cycles, time, temperature) or can be calculated by simulation using diffusion models (modelling). Annex 1 illustrates the involvement of simulation in assessing organic material in contact with drinking water.

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