The aim of this study was to evaluate the behavior of high-noble gold-platinum alloy
samples (18+8 Rafinerija plemenitih kovina, Zagreb, Hrvatska), in a phosphate buffer
pH 6.0. The aim of the study was to determine the type and amount of released metal
ions from the alloy, and to evaluate how the time of exposure to the phosphate buffer pH
6.0 influences the release of metal ions from the alloy. Manufacturer samples 8.06.5
1.0 mm in size, with a surface area of 133mm2 were used. The release of metal ions from
the tested alloy was measured in ten time periods (after 1, 2, 3, 4, 5, 6, 7, 14, 21 and 30
days). Six samples were used (n=6) for each time period that the alloy was in the solution,
which means that a total of 60 samples was analyzed. Solutions, in which the samples
were placed, were analyzed with the inductively coupled plasma atomic emission
spectrometer (ICP-AES, JY 50P, Jobin-Ywon, France). It was found that four metal ions
were released: zinc ions (Zn), chromium ions (Cr), copper ions (Cu) and iron ions (Fe).
The most released ions from the gold-platinum alloy were those of zinc (Zn), and the
least released were those of iron (Fe) (p<0.01). The results of the study show that the
time the tested alloy spent in the phosphate buffer pH 6.0 solution has an effect on the
release of ions (p<0.01)
