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  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Mercury-cycling in surface waters and in the atmosphere — Species analysis for the investigation of transformation and transport properties of mercury (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 350 (1994), S. 21-29 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The river Elbe has been one of the most contaminated rivers with regard to mercury for many years. In 1991 a length-profile has been measured for mercury and methylmercury (CH3Hg+) from Obristvi, Czech Republic, to the German bight. Total mercury has been measured by cold vapor atomic absorption spectrometry (CVAAS). The organo mercury compounds have been separated by high performance liquid chromatography (HPLC) connected on-line to an atomic fluorescence spectrometer (AFS) by a continuous flow-system. Total mercury up to 120 mg Hg+/kg and CH3Hg+ concentrations up to 130 μg CH3 Hg+/kg could be detected in special sites. The formation of CH3Hg+ in sediments can be caused besides the methylation of mercury, by sulphate reducing or methanogenic bacteria and transmethylation reactions with organometals. Atmospheric mercury concentrations have been measured at three different European sites. Samples have been collected on goldcoated glass balls or on quartz wool, respectively. After thermal desorption mercury has been determined using the two step amalgamation technique with AFS detection. Compared to natural background concentrations of total gaseous mercury (TGM), slightly increased levels could be detected at a rural site in Germany. This increase can probably be explained by long-range transport processes. Within the vicinity of a inactivated mercury production plant high concentrations of up to 13.5 ng/m3 particle associated mercury (Hgpart) have been detected. Consequently, dry deposition of mercury in the particulate form can intensify the total deposition flux close to Hg-emitting sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326247
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transformations of mercury species in the presence of Elbe river bacteria (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 7 (1993), S. 127-135 
    Details
    ISSN: 0268-2605
    Keywords: Mercury ; methylmercury ; transmethylation ; biomethylation ; demethylation ; species ; bacteria ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of Elbe river bacteria isolated from suspended particulate matter (SPM) on dynamic species transformation of mercury was investigated. Experiments were carried out in the presence of bacteria (batch cultures) and in sterile tapwater as a control. For the methylation of inorganic mercury ions by bacteria several cofactors are under discussion. In this work, methylcobalamin, methyl iodide and S-adenosylmethionine were tested as biogenic methyl donors and trimethyl-lead chloride, trimethyltin chloride and dimethylarsenic acid as abiotic methyl donors. Transmethylation reactions as examples of abiotic methyl transfers have higher effectiveness in the formation of methylmercury (CH3Hg+) than methylation with biogenic compounds. This result was observed in batch cultures as well as in sterile water. SPM-bacteria inhibit methyl transfer to mercury(II) ions. This is not only due to passive adsorption processes of mercury(II) to bacterial cell walls; methylmercury is also decomposed very rapidly by SPM-bacteria and is immobilized as mercury(II) by the cells.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590070207
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  • 3
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    Mercury-cycling in surface waters and in the atmosphere ? Species analysis for the investigation of transformation and transport properties of mercury (1994)
    Springer
    Details
    Publication Date: 1994-01-01
    Print ISSN: 0937-0633
    Electronic ISSN: 1432-1130
    Topics: Chemistry and Pharmacology
    Published by Springer
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