Mercury and mercurial salts

Acetylene Bromine, chlorine, brass, copper and copper salts, fluorine, mercury and mercury salts, nitric acid, silver and silver salts, alkali hydrides, potassium metal... 

There have been numerous reports of possible allergic reactions to mercury and mercury salts and to the mercury, silver and copper in dental amalgam as well as to amalgam corrosion products Studies of the release of mercury by amalgams into distilled water, saline and artificial saliva tend to be conflicting and contradictory but, overall, the data indicate that mercury release drops with time due to film formation and is less than the acceptable daily intake for mercury in food . Further, while metallic mercury can sensitise, sensitisation of patients to mercury by dental amalgam appears to be a rare occurrence. Nevertheless, there is a growing trend to develop polymer-based posterior restorative materials in order to eliminate the use of mercury in dentistry. 

Caution. Chalcogenophenols have an unpleasant odor and are toxic. H2S, H2Se, or H2Te may be liberated on treatment with acid or exposure to the open air. These compounds should therefore be handled under inert gas in a well-ventilated hood. Contaminated glassware should be treated with sodium hypochlorite (bleach) solution for several hours and rinsed thoroughly with water and acetone before removal from the fume hood. Mercury and mercury salts are highly toxic, and skin and eye contact must be avoided. Mercury residues should be disposed of as toxic heavy metal waste. 

The reaction may be assisted mechanically by mixing with kieselgiihr, or other finely divided material, and catalytically by the addition of iodine, or alkali metavanadate (U.S.P., 1915925) in the case of benzene, and of boric acid, mercury and mercury salts in the case of anthraquinone. 

Another test method for the determination of mercury in coal (ASTM D-6414) involves (method A) solubilizing of the mercury in the sample by heating the sample at a specified temperature in a mixture of nitric and hydrochloric acids. The acid solutions produced are transferred into a vessel in which the mercury is reduced to elemental mercury. The mercury vapor is determined by flameless cold-vapor atomic absorption spectroscopy. An alternative method (method B) involved solubilization of the mercury by heating the sample in a mixture of nitric acid and sulfuric acid with vanadium pentoxide. The acid solution is then transferred into a vessel in which the mercury is reduced to elemental mercury. The mercury content is determined by flameless cold-vapor atomic absorption spectroscopy. However, mercury and mercury salts can be volatilized at low temperatures, and precautions against inadvertent mercury loss should be taken when using this method. 

The longest known influence of catalysts on sulfonation is that of mercury and mercury salts, which not only accelerates the reaction but also determines the site of substitution owing to intermediate formation of organometallic compounds.156 Thus, whereas anthraquinone-2-sulfonic acid is formed from anthraquinone and oleum,124 1 the 1-sulfonic acid is obtained when mercury salts are present.124 1... 

Sulfophthalic anhydride is formed on sulfonation of phthalic anhydride by oleum, but presence of mercury(i) sulfate leads to the 3,5-disulfonic acid.162 The catalytic effect of mercury and mercury salts is also applied to the conversion of 4-methylpyridine into 4-methyl-3-pyridinesulfonic acid163 and of... 

MERCURY AND MERCURIAL SALTS [SED-15,2259 SEDA-32,419 SEDA-33,453 SEDA-34,358)... 

Electrode preparation consists of mercury and mercury salt preparation [98, 99] ... 

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