The Black Sea is the largest euxinic basin on the Earth. The anoxic zone consists of the upper part water mass stratified by density, and the lower water mass homogenized relative to density (depth >1750 m), named the Bottom Convective Layer. To assess homogeneity and possible exchange of matter across the upper and lower boundaries of the Bottom Convective Layer, new data on stable isotope com...

Sulfated silica (SO4/SiO2) and nickel impregnated sulfated (Ni-SO4/SiO2) catalysts have been successfully carried out for the conversion of ethanol into diethyl ether (DEE) as a biofuel. The aims this research were to study effects acidity on SO4/SiO2 Ni-SO4/SiO2 in ether. This focuses increases activity selectivity SiO2 with impregnation sulfate Ni metal, which had good less expensive. prepare...

Stable sulfur isotope measurements (delta34S) made on samples collected from a 2 m snowpit on the Inilchek Glacier, Tien Shan Mountains (42.16 degrees N, 80.25 degrees E, 5100 m) are used to estimate sources of sulfate (SO4(2-)) in high-elevation Central Asian precipitation. Comparison of snowpit oxygen isotope (delta18O) data with previous work constrains the age of the snowpit samples to the ...

Growing and confluent cultures of a rat hepatocyte cell line were labeled with 35SO4(2-) and the heparan sulfate in the culture medium, the pericellular matrix, the nucleus, the nuclear outer membrane, and the remaining cytoplasmic pool was purified by DEAE-cellulose chromatography. The heparan sulfate in all pools from the confluent cells was bound more strongly on the DEAE-cellulose column th...

In the title salt, (C2H10N2)3[Pr2(SO4)6]·6H2O, the Pr(III) cation is surrounded ninefold by five sulfate groups (two monodentate and three chelating) and by one water mol-ecule [range of Pr-O bond lengths 2.383 (3) to 2.582 (3) Å]. The [Pr(SO4)5(H2O)] groups are arranged in sheets parallel to (010). Two crystal water mol-ecules and two ethyl-enedi-ammonium cations (one with point group symmetry...

In the title salt, [(CH3)2NH2][Cu(HSO4)(SO4)(H2O)4], one type of cation and anion is present in the asymmetric unit. The Cu(II) atom in the complex anion, [Cu(HSO4)(SO4)(H2O)4](-), has a tetra-gonal bipyramidal [4 + 2] coordination caused by a Jahn-Teller distortion, with the aqua ligands in equatorial and two O atoms of tetra-hedral HSO4 and SO4 units in apical positions. Both types of ions fo...

The vapour phase selective conversion of glycerol to acetol at normal atmospheric pressure in a fixed-bed micro reactor was investigated over SO4 2 and WOx promoted ZrO2 and M-ZrO2 (M = Al2O3 or TiO2) solid acid catalysts. The investigated sulfate and tungstate ion promoted zirconia-based catalysts were prepared by both coprecipitation and impregnation methods and calcined at 923 K. The synthes...

Anhydrous sulfate minerals are abundant in the active fumaroles with highly oxidizing conditions on scoria cones of Tolbachik volcano. The mineral itelmenite, ideally Na2CuMg2(SO4)4, containing isomorphous admixture Zn, was described 2018, whereas glikinite, Zn3O(SO4)2, 2020. Synthetic analogs both were obtained during studies phase formation Na2SO4–CuSO4–MgSO4–(ZnSO4) systems which lead to ess...

Figure 1. Stability fields of sulfate and bisulfide at a total pressure of 100 bar. The thin solid curves represent equal activities of SO4 and HS at various pH. The QFM curve represents equilibrium (2) and HM stands for hematitemagnetite buffer. Sulfate is stable at higher temperature and lower ƒH2. Low-temperature formation of sulfate in asteroidal environments requires complete oxidation of ...

The asymmetric unit of the title salt, 2C4H8N5 (+)·SO4 (2-)·5H2O, contains four 2,4,6-tri-amino-pyrimidinium (TAPH(+)) cations, two sulfate anions and ten lattice water mol-ecules. Each two of the four TAPH(+) cations form dimers via N-H⋯N hydrogen bonds between the amino groups and the unprotonated pyrimidine N atoms [graph-set motif R 2 (2)(8)]. The (TAPH(+))2 dimers, in turn, form slightly o...