Costa Raquel Dalla, Cossich Eneida Sala, Tavares Célia Regina Granhen
Department of Chemical Engineering, State University of Maringá, Maringá - PR, Brazil.
Sci Total Environ. 2008 Dec 15;407(1):1-6. doi: 10.1016/j.scitotenv.2008.09.013. Epub 2008 Oct 19.
One of the qualitative methods for the identification of mercury vapor is what it occurs as a way of chemical reaction between palladium chloride and metallic mercury. Palladium chloride ribbons with yellowish coloration put in contact with the vaporized mercury of dental amalgam residue, liberates palladium and forms mercury chloride in your surface, and starts to have black coloration; this form identify the presence of the mercury vapor in the system. This work studies the influence of temperature, volume and type of barrier-solution in the vaporization of mercury during the period of storage of dental amalgam residues, aiming to establish the best conditions for storage of these residues. It was found that for all tested solutions, the longest storage times without any occurrence of mercury vaporization were obtained in the lowest temperatures tested and the largest solution volumes of barrier-solution. The radiographic effluent presented bigger efficacy in the reduction of the volatilization, increasing the period when the residue was stored, however the analysis of this solution after the vaporization test showed the presence of organic mercury. These results show that water is the most efficient barrier against the vaporization of mercury, since it did not result in organic mercury formation in the effluent solution from the storage process.
鉴定汞蒸气的定性方法之一是利用氯化钯与金属汞之间的化学反应。将带有微黄色的氯化钯试纸与牙科汞合金残渣的汽化汞接触，钯会被释放出来，并在试纸表面形成氯化汞，试纸开始变黑；这种方式可鉴定系统中汞蒸气的存在。本研究旨在探讨温度、体积和屏障溶液类型对牙科汞合金残渣储存期间汞汽化的影响，以确定这些残渣的最佳储存条件。研究发现，对于所有测试溶液，在测试的最低温度和最大体积的屏障溶液条件下，获得了最长的无汞汽化储存时间。放射性流出液在减少挥发方面表现出更大的功效，延长了残渣的储存时间，然而，汽化试验后对该溶液的分析表明存在有机汞。这些结果表明，水是防止汞汽化的最有效屏障，因为在储存过程中其流出液中不会形成有机汞。
