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Special Articles on Global and Regional Environment and Chemistry Sublimation Pressure of Organic Mercury(11) Compounds Fumiaki KAI*, Kooji TAJIMA**, Ryou YAMADA***, Yuuji NODA***, Tsutomu YUNOUE** and Hu HUANG Department of Environmental Science, Graduate School of Natural Science and Technology, Kumamoto University ; Kumamoto-shi 860 Japan ** Kumamoto Municipal Institute of Public Health ; Tainoshima, Kumamoto-shi 862 Japan *** Department of Chemistry, Faculty of Science, Kumamoto University Kumamoto-shi 860 Japan The sublimation pressures of six organic mercury( II) compounds (CH3HgC1 (MMC) ; CH3HgBr (MMB) ; CH3HgI (MMI) ; C2H5HgC1 (EMC) ; C2H5HgBr (EMB) ; C2H5HgI (EMI)) were determined for the first time using a newly designed vacuum apparatus. The temperature dependences of the sublimation pressures obtained by the least squares method were as follows (P = Pa unit and T = absolute temperature). MMC : 1nP = 1. 86 X 106T-2 14. 28 X 103T-' + 31. 36 (10 150 C) MMB : 1nP = 3. 38 x 106T-2 24. 73 X 103T-' + 49. 33 (10 120 C) MMI : 1nP = 2. 93 X 106T-2 20. 93 X 103T-' + 41. 26 (1O-'15O C) EMC : lnp = 6. 39 X 103T-' ± 22. 11 (100-150 C, r 0. 960) EMB 1nP = 9. 24 x 103T-' + 28. 74 (100-160 C, r = 0. 979) EMI : 1nP = 7.76 X 103T-' + 25. 46 (100'-'160 C, r = 0.991) The enthalpy changes for sublimation of methylmercury ( H ) halides at 20 C calculated using the above equations were smaller than those of ethylmercury (fl) halides. In other words, the sublimation pressures of methylmercury ( II ) halides at 20 C were enormously larger than those of ethylmercury ( II ) halides. In addition, it was worthy of remark that the pressure of MMC (77. 78 X 103 Pa), which had been known as the causal agent of so-called "Minamata Disease", was several hundred times larger than that of metallic mercury (0. 22 x 103 Pa at 20 C), whose vapor is known to be very poisonous even at room temperature. As one of the important thermo dynamical quantities, the molar volumes at respective melting point were also determined. As the result, the differences of the sizes of alkyl group and halogen were clearly reflected in these molar volumes.