Arsenic, arsenic trioxide and pentoxide, arsenous acids, arsenic acid and their salts (arsenites and arsenates) are carcinogenic substances (Carcinogen category 1) and do not, therefore, have MAK and BAT values (Greim 2002). The former TRK value (technical exposure limit) for arsenic and its inorganic compounds was 0.10 mg arsenic/m (measured as the inhalable fraction of the aerosol; calculated...

In our attempt to search for mixed alkaline-earth and transition metal arsenates, the title compound, barium dimanganese(II) bis-(arsenate), has been synthesized by employing a high-temperature RbCl flux. The crystal structure of BaMn2(AsO4)2 is made up of MnO6 octa-hedra and AsO4 tetra-hedra assembled by sharing corners and edges into infinite slabs with composition [Mn2(AsO4)2]2- that extend ...

Jarosewichite, Mn3+Mn3+(AsOn)(OH)0, is a new mineral, closely related to chlorophoenicite, from the Franklin mine, Franklin, Sussex County, New Jersey, where it occurs associated with andradite, franklinite, flinkite, cahnite and hausmannite. Jarosewichite is orthorhombic, space grotp C2lmLlm2lm, C222 or Cmm2, with a : 6.56(3), b : 25.20(10), c : 10.00(5)4, and Z : 8. The strongest lines in the...

A bacterial strain, GFAJ-1 was recently proposed to be substituting arsenic for phosphorus to sustain its growth. We have performed theoretical calculations for analyzing this controversial hypothesis by examining the addition of phosphate to ribose and glucose. Dispersion corrected Density Functional Theory (DFT) calculations in small molecules and QM/MM calculations on clusters derived from c...

The performance of anionic exchange resin Dowex 1x8 in the removal arsenic(V) from aqueous solutions was investigated. Batch experimentation carried out under different variables, including, stirring speed applied on system, pH solution, dosage and temperature. Due to characteristic speciation phases, this element solution is negligible at highly acidic or alkaline values, but it possible range...

The copper pyrometallurgical industry faces the precipitation of un-soluble slimes containing bismuth, arsenic and antimony that can reduce purity. Ion-exchange resins are used to treat electrolyte avoid their precipitation. After resin saturation, a regeneration stage with 17%(w/w) hydrochloric acid bismuth (e.g. up 10 g/L) is currently limed. In this work, selective process was developed reco...

Z. Naturforsch. 56 b, 753-758 (2001); received March 12, 2001 Kuznetsovite, Mercury Cluster Hg34+, Merohedral Twinning The compounds (Hg3)(PC>4)Cl, (Hg3)(AsC>4)Cl and (Hg3)(As0 4 )Br have been prepared under hydrothermal conditions at 200 °C, starting from stoichiometric mixtures of the corresponding mercury halides and mercury phosphates or arsenates, respectively. The formula (Hg3)( As0 4 )Cl...

Bond paths, local energy density properties, and Laplacian, L(r) = -wedge(2)rho(r), composite isosurfaces of the electron density distributions were calculated for the intramolecular and intermolecular bonded interactions for molecular solids of As(2)O(3) and AsO(2) composition, an As(2)O(5) crystal, a number of arsenate molecules, and the arsenic metalloid, arsenolamprite. The directed intermo...