Mercury selenates

Gospodinov and Barkov [91GOS/BAR] determined the phase diagram of the system HgSe04-H2Se04-H20 at 373.15 K. Only HgSe04-H20 and HgSe04 were observed as solid phases. 

No other data pertaining to the review have been found. 

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Selen-oxyd, n. selenium oxide, -quecksilber, n. mercury selenide. -quecksilberblei, n. (Min.) lehrbachite. -salz, n. selenide. 

The authors [35] emphasize that their result regarding the first HgS monolayer, which involves reversible underpotential adsorption, suggests that nucleation cannot be considered as a universal mechanism for the formation of anodic films. Analogous conclusions have been inferred for cathodic HgSe films electrodeposited on mercury electrode by the reduction of selenous acid [37] the first monolayer appeared to be reversibly adsorbed, while formation of the following two layers was preceded by nucleation. 

A Cd compound Cd3(Se03)2(Se04), with both selenite and selenate, has been presented. The 3-D network with channels running along the b axes in P2 (Z = 2) contains three independent CdO, polyhedra (x = 6, 8), three independent Se03 pyramids, and one Se04 tetrahedron.294 It should be mentioned that this compound is isotypic with the analogous mercury compound.295... 

A blue compound, apparently analogous to sulphonitronic acid (p. 251), is formed on the addition of mercury to a solution of nitrosylselenic acid in selenic acid monohydrate,5 or by reducing a solution of sodium nitrite in concentrated selenic acid by means of mercury. The presence of copper selenate facilitates the reaction. The selenonitronie acid is very readily oxidised and appears to be stable only in the presence of concentrated selenic acid. 

Other compounds may be found in leachate from landfills, e.g., borate, sulfide, arsenate, selenate, barium, lithium, mercury, and cobalt. In general, however, these components are not often measured when they are measured, they are usually present in very low concentrations and are considered only of secondary importance. 

A summary of the influence of selenium on deposition of mercury in rat tissues is presented in Table III. In the injection experiments, selenium caused a reduction in mercury deposition in the kidneys of rats given either inorganic or organic mercury. The reduction in kidney mercury is dependent upon the level of selenium injected and the chemical form of selenium (Fang, 1977). Selenomethionine was most effective in reducing the renal mercury content, followed by selenocystine, selenate, and selenite. In contrast to the kidneys, selenium usually resulted in an increased deposition of mercury in other tissues. It is of particular interest that selenium appears to be very effective in increasing methylmercury deposition in the brain. When included in the diet, selenium also causes an increased deposition of hepatic mercury. This is consistent with the results of selenium injection experiments. Deposition in the kidney may depend upon the level in the diet. At low mercury levels, selenium resulted in decreased levels in the kidneys but in increased levels at... 

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