Methods for assessment of lead releasefrom brass to drinking water

20 Apr 2012 13:01 | Mette Bøgevang

Relevant svensk rapport til sammenligning af nordisk NKB4 test og europæisk/tysk RIG test af produkter i kontakt med drikkevand

Methods for assessment of lead releasefrom brass to drinking water


  • 1 Jun 2021 13:24 | Mette Bøgevang
    Rapporten er produceret med hjælp fra velkendte personer, og det fremgår blandt andet af resuméet at:

    This study shows that a product will perform differently depending on the test method, and that the results from a short-term product test are not related to the results in a long term material test. The two product tests proved to give very different results; while all samples passed the Scandinavian product test, no sample passed the American product test. Furthermore, the Scandinavian product test has been proved to be unreliable due to a number of reasons such as low repeatability, inconsistency with current drinking water parametric value and test water which does not represent a worst case.

    The conclusion is that the choice of test method influences the result and that short-term test cannot be used to predict the outcome of a long term test. The current Scandinavian product approval is not a reliable method for long term testing of products.

    6.3.2. Reproducibility

    Though only two samples of each material were tested in the Scandinavian method, it is possible to say that variance is too high not to be considered. A major drawback of the Scandinavian test method is the fact that it does not consider these variations, and might result in misinterpretations of a products’ suitability for drinking water applications. This is an observation in line with the ones made by the Swedish Board of Housing, building and Planning during their evaluation of faucets available on the market

    6.3.3 Water Quality

    In the Scandinavian test, an increase of Pb release from unwashed samples could be observed when using local Stockholm water, compared to standard test water. This was in contradiction to what was expected, since a test water should represent a worst-case. A possible explanation could be that the standard test water is less corrosive than public drinking water.

    Hvis man her sammenligner Stockholm vand med det noget mere aggressive danske vand, kan der måske tænkes en mulighed for at forskellen er endnu større mellem testvand og aktuelt dansk vand