McDermott A J, Kothari S, Short R D, van Noort R, Alexander M R
Laboratory for Surface & Interface Analysis, Department of Engineering Materials, Sheffield, United Kingdom.
J Dent Res. 1998 Dec;77(12):1999-2004. doi: 10.1177/00220345980770120801.
In amalgam, mercury is intended to take the form of stable intermetallic compounds. Any mercury leakage must therefore come from free mercury not involved in such compounds. Thus, a knowledge of the exact surface chemistry of dental amalgam is necessary if this phenomenon is to be understood. From XPS and EDS analyses, a model of the surface chemistry of amalgam is proposed which fully characterizes all the phases that are present. The data show the surface to have a composition different from that of the bulk, being comprised of a hydrocarbon deposit and adsorbed water covering the intermetallic phase gamma2 (Sn(6-8)Hg), tin (iv) oxide, and mercury in a free state. After amalgamation, the amount of mercury at the surface decreases with time and eventually attains a constant concentration, where it is all involved in the gamma2 phase, leaving no free mercury. A model is proposed for the surface of amalgam and the changes in this model with time.
在汞齐中，汞旨在形成稳定的金属间化合物。因此，任何汞泄漏都必定来自未参与此类化合物形成的游离汞。所以，如果要理解这种现象，就必须了解牙科汞齐确切的表面化学性质。通过X射线光电子能谱（XPS）和能谱仪（EDS）分析，提出了一种汞齐表面化学模型，该模型全面表征了所有存在的相。数据表明，表面的组成与本体不同，它由覆盖金属间相γ2（Sn(6 - 8)Hg）、氧化锡（IV）和游离态汞的碳氢化合物沉积物及吸附水组成。汞齐化后，表面汞的量随时间减少，最终达到恒定浓度，此时所有汞都参与到γ2相中，不再有游离汞。本文提出了一个关于汞齐表面的模型以及该模型随时间的变化情况。
