Ceramics-Silikáty 45 (1) 31-34 (2001)

SURFACE TREATMENT OF LEAD GLASSES FOR REDUCING THE LEACHING OF LEAD

 L. Rybaříková, L. Dvorská, H. Hradecká, P. Jiříček 

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.