Enhanced evaporation of mercury from amalgams in non-oxidizing environments

Jack Ferracane, H. Nakajima, T. Okabe

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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°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°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°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.

Original languageEnglish (US)
Pages (from-to)300-305
Number of pages6
JournalDental Materials
Volume9
Issue number5
DOIs
StatePublished - 1993

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Mercury amalgams
Mercury (metal)
Mercury
Hydrogen
Evaporation
Argon
Atmosphere
Air
Copper
Compressed Air
Compressed air
Gold
Oxides
Oxide films
Gases
Temperature

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Enhanced evaporation of mercury from amalgams in non-oxidizing environments. / Ferracane, Jack; Nakajima, H.; Okabe, T.

In: Dental Materials, Vol. 9, No. 5, 1993, p. 300-305.

Research output: Contribution to journalArticle

Ferracane, Jack ; Nakajima, H. ; Okabe, T. / Enhanced evaporation of mercury from amalgams in non-oxidizing environments. In: Dental Materials. 1993 ; Vol. 9, No. 5. pp. 300-305.
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