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Metal leaching from ceramic glazes: Lab report example

Notes

This lab is certified by the US Department of Environmental Protection (DEP) for drinking water and waste water analysis. They also provide pottery glaze leaching analyses (the water is kept in contact with the glaze for many days then analysed for trace levels of specific metals). Each suspected metal must be tested for and each entails a separate charge ($30-60 in this case). That means that testing one glaze for several metals could cost $200. How to make sense of these numbers? Google the term: "heavy metals drinking water standards", and click "Images". You will find many charts with lots of data (some of them show multiple sources). By searching pages for this term you will find books having detailed sections on each of the metals. This can seem overwhelming, but typically you are only interested on one metal in a specific glaze (often cobalt or manganese).

Metal leaching from ceramic glazes: Lab report example

Links

URLs https://www.dep.pa.gov/Citizens/My-Water/PrivateWells/Pages/Water-Testing.aspx
USA DEP water testing info page
URLs https://www.who.int/water_sanitation_health/publications/2011/9789241548151_ch12.pdf
Chemical contaminants in drinking water
Glossary Leaching
Ceramic glazes can leach heavy metals into food and drink. This subject is not complex, there are many things anyone can do to deal with this issue
Articles Are Your Glazes Food Safe or are They Leachable?
Many potters do not think about leaching, but times are changing. What is the chemistry of stability? There are simple ways to check for leaching, and fix crazing.
Articles Attack on Glass: Corrosion Attack Mechanisms
Max Richens outlines the various mechanisms by which acids and bases can dissolve glass and glazes. He provides some information on stabilizing glazes against attack.
Articles Having Your Glaze Tested for Toxic Metal Release
Having Your Glaze Tested for Metal Release

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