Comment on 'Destruction of organohalides in water using metal particles: carbon tetrachloride/water reactions with magnesium, tin and zinc'

Article Abstract:

Boronina et al.'s assumptions on the degradation of CCl4 in aqueous media were erroneous. The hydrogen ion concentration and electron reduction potentials are important variables for the zero-valent metal reduction of chlorocarbons in aqueous media. However, Bornina et al. failed to consider the evolution of hydrogen gas in the solution-metal interface which leads to the degradation of the metal. Furthermore, their reaction sequence for Zn and Sn surfaces was inconsistent with the postulated mechanism that mediates the degradation of the metal.

Oxidation-reduction reaction, Oxidation-reduction reactions, Carbon tetrachloride, Organochlorine compounds, Organic chlorine compounds, Halides

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New approach for the analysis of acidic pesticides in water by LC/MS with a particle beam interface

Article Abstract:

A micro-flow rate particle beam interface has been developed to improve applications combining the use of high-performance liquid chromatography and mass spectrometry. The combination of the last two methods presents problems involving the ionization of unstable solutes. The improved interface method minimized the mobile-phase flow rate to remove problems associated with substantial solvent use and exhibited favorable results for the analysis of acidic pesticides in water.

Usage, Pesticides, Particle beams

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Metals in water: determining natural background concentrations in mineralized areas

Article Abstract:

Three methods for evaluating natural background water chemistry in mineralized areas that have been mined are presented. These range from qualitative and quantitative approaches aim to examine historical records, compare metal concentrations between mined and nonmined aras as well as devlop geochemical models. These methods demonstrate that contact between water and undisturbed mineral deposits will result to contamination.

Environmental aspects, Mineral deposits, Mines and mineral resources, Mining

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