PubMed · 6546500
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R Gherardi, P Brochard, B Chamak, J F Bernaudin, S Duckett, J Poirier. 1984. Human generalized argyria.. https://pubmed.ncbi.nlm.nih.gov/6546500/
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X-ray fluorescence (XRF) has been demonstrated to be an extremely useful technique for measuring trace quantities of heavy metals in various tissues in the body. This study investigates the applicability of XRF to the measurement of silver concentrations in skin. The system chosen employs an 125I source to excite the silver K x-rays, with the source, sample and detector arranged in a 90 degrees geometry. Experiments with silver-doped skin phantoms indicate that a minimum detectable concentration of 3-4 ppm is possible in 10-20 min measurement periods. Based on estimates of silver concentrations in the skin of patients suffering from argyria, the proposed system has sufficient sensitivity to warrant further investigation into its usefulness for non-invasive monitoring of exposed populations. Specifically, such a measurement may well allow for the identification of individuals at risk of subsequently exhibiting argyria, an irreversible skin pigmentation arising from silver exposure.
The aim of this study was to investigate the long-term effects of alloys containing silver (mainly Ag-Sn alloy) on oral mucous tissue. We observed biopsy tissue specimens from patients diagnosed as having amalgam tattoo and/or metal pigmentation by light and electron microscopy and electron-probe microanalysis (EPMA). In most cases, Ag-Sn alloy was present in the tissue but it could not be confirmed if the alloy originated from amalgam. Distributions of both Ag-S and Ag-Sn have typical patterns. Most Ag forms Ag2S and is stably deposited in three patterns along the collagen, basement membrane, and fibrous cells without inducing any host reaction. On the other hand, Sn forms large granules that contain Ag, S, C, N, P, and Ca, and is in soft state in the tissue. Tissue reactions to the alloy become weaker as time passes.