Ferracane J L, Nakajima H, Okabe T
Department of Dental Materials Science, Oregon Health Sciences University, Portland.
Dent Mater. 1993 Sep;9(5):300-5. doi: 10.1016/0109-5641(93)90047-t.
The release of mercury from two freshly triturated amalgams exposed to a reducing atmosphere, hydrogen, was quantitated at three different temperatures. A low-copper and a high-copper amalgam were placed into a flowing hydrogen gas atmosphere for 60 min after trituration, and then the hydrogen was replaced by compressed air. The results were compared to those obtained in a previous study in which air and argon atmospheres were used under identical conditions. At 37 degrees C, the rate of evaporation of mercury from the amalgams was similar when they were exposed to hydrogen before being exposed to air. During exposure to hydrogen, the evaporation rate appeared to exceed the limit of the gold film mercury analyzer (284 pg/mm2/s), but was rapidly reduced upon exposure to air. The results were identical to those from argon exposure. When the same experiment was performed at 80 degrees C, the evaporation rate after hydrogen exposure was greater than that after exposure to argon, and far greater than that during exposure to air alone. Similar results were achieved at 110 degrees C, but there was less difference between hydrogen and argon exposure. The results support previous studies which show that the evaporation of mercury from amalgam is mainly limited by the formation of an oxide film.
在三种不同温度下，对两种新研磨的汞合金在还原性气氛氢气中汞的释放量进行了定量测定。将一种低铜汞合金和一种高铜汞合金在研磨后置于流动的氢气气氛中60分钟，然后用压缩空气取代氢气。将结果与之前在相同条件下使用空气和氩气气氛进行的一项研究所得结果进行比较。在37摄氏度时，汞合金在暴露于空气之前先暴露于氢气时，汞的蒸发速率相似。在暴露于氢气期间，蒸发速率似乎超过了金膜汞分析仪的检测极限（284皮克/平方毫米/秒），但在暴露于空气后迅速降低。结果与氩气暴露的结果相同。当在80摄氏度下进行相同实验时，氢气暴露后的蒸发速率大于氩气暴露后的蒸发速率，且远大于仅暴露于空气时的蒸发速率。在110摄氏度时也得到了类似结果，但氢气和氩气暴露之间的差异较小。这些结果支持了之前的研究，即汞合金中汞的蒸发主要受氧化膜形成的限制。
