Metoder för att bedöma urlakning av bly från mässing till dricksvatten
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Brass is a material widely used in drinking water applications such as faucets, mixers and fittings. Brass contains small amounts of lead (Pb) which may, under unfavourable circumstances, be released to the drinking water. The parameters which affect this release are many and not fully understood today. Among these parameters are water chemistry, operation time, stagnation time, material composition, product geometry, treatment and processing of the material. The aim of this study is to summarize current knowledge about Pb contamination from brass products to drinking water and to compare three methods for assessment of Pb release; a European material test, a Scandinavian product test and an American product test. 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.
Place, publisher, year, edition, pages
2012. , 54 p.
Teknik, bly, mässing, dricksvatten, lead, brass, drinking water
IdentifiersURN: urn:nbn:se:ltu:diva-42193Local ID: 03f494ed-d9a5-4028-8aa9-96250cbaa3e3OAI: oai:DiVA.org:ltu-42193DiVA: diva2:1015410
Subject / course
Student thesis, at least 30 credits
Validerat; 20120703 (anonymous)2016-10-042016-10-04Bibliographically approved