Ceramics-Silikáty 45, (1) 31 - 34 (2001) |
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SURFACE TREATMENT OF LEAD GLASSES FOR REDUCING THE LEACHING OF LEAD
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Rybaříková Ludmila 1, Dvorská Libuše 1, Hradecká Helena 1,
Jiříček Petr 2
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1 Department of Glass and Ceramics, Institute of Chemical Technology,
Technická 5, 166 28 Prague
2 Institute of Physics, Academy of Sciences of the Czech Republic,
Cukrovarnická 10, 162 53 Prague
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Lead crystal glass was studied in order to establish the effect of preliminary treating the surface on concentration profiles of
lead in the surface and on lead leaching into acetic acid solutions. The surface was treated in two ways: 1) by exposure in
solutions of acids (acetic acid, hydrochloric acid), 2) exposing the surface to decomposition products of ammonium chloride
at the elevated temperature. Both treatments resulted in reducing the leaching of lead from the surface while the effect of
decomposition products of ammonium chloride was more efficient. The latter treatment also succeeded in extracting lead from
deeper layers of glass. |
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