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  • 1
    Electronic Resource
    Electronic Resource
    Observation of Unusual Organic Mercury Species in Soils and Sediments of Industrially Contaminated Sites (1995)
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 1845-1850 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00007a020
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  • 2
    Electronic Resource
    Electronic Resource
    Isotopic shifts in chemical exchange systems. I. Large isotope effects in the complexation of sodium(1+) isotopes by macrocyclic polyethers (1981)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 103 (1981), S. 5707-5711 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00409a015
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  • 3
    Electronic Resource
    Electronic Resource
    “Mercury as a Global Pollutant”— International conference (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 361-362 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050430
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  • 4
    Electronic Resource
    Electronic Resource
    Mercury and methylmercury in sediments and suspended particles from the river Elbe, North Germany (1991)
    Springer
    Water, air & soil pollution 56 (1991), S. 427-437 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Total Hg and McHg concentrations have been determined in sediments and suspended particulate matter from one of the most Hg-polluted rivers of the world, the Elbe river in Northern Germany. Results of total Hg and McHg are presented. Total Hg concentrations in suspended particulate matter (SPM) are 30 mg kg−1 in the average and up to 150 mg kg−1 as the maximum value. Total Hg-fluxes −1 calculated from measurements of an automatically operating station upstream Hamburg as about 17 ta−1 in suspended particles. A new McHg determination by HPLC chromatography and photometric detection was developed and verified. Methylmercury concentrations were up to 10% of the total Hg, i. e. 2.7 mg kg−1 (dw).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342289
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  • 5
    Electronic Resource
    Electronic Resource
    The role of humic substances in the aqueous mobilization of mercury from contaminated floodplain soils (1996)
    Springer
    Water, air & soil pollution 90 (1996), S. 507-520 
    Details
    ISSN: 1573-2932
    Keywords: mercury ; foodplains ; humic substances ; complexation ; speciation ; mobilization ; risk assessment ; water solubility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The water-mobilizability of mercury from contaminated floodplain soils of the river Elbe in Northern Germany was evaluated by batch extraction experiments. It was shown that only a small amount of the total mercury present (about 1% per extraction) can be mobilized by water. This mercury is transported entirely in the form of a complex bound to humic acids (HA); particulates and fulvic acids (FA) did not seem to contribute to the process. It could not be removed from the HA even at pH 1, indicating an extremely strong complexation e.g. by sulfur-containing ligands. Furthermore, the influence of pH on the mobilization was investigated. It was found that in the range of natural pH-values, there was no observable effect of pH on the mobilization of either mercury or dissolved organic carbon (DOC). This surprising finding is explained by an unexpectedly high buffering capacity of the humics, both in the acidic and in the alkaline region. Only at extreme pH-values there was deviation from this behaviour. In contrast to other heavy metals, the amount of mobilized mercury decreases at pH 〈 3; and at pH 〉 12, an increased mobilization of mercury was observed because the humics are mobilized completely, accompanied by the total amount of mercury bound to them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282665
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  • 6
    Electronic Resource
    Electronic Resource
    Mercury speciation in contaminated soils by thermal release analysis (1996)
    Springer
    Water, air & soil pollution 89 (1996), S. 399-416 
    Details
    ISSN: 1573-2932
    Keywords: mercury speciation ; soil ; thermal release analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Thermal release analysis of mercury species in contaminated soils was performed by temperature controlled continuous heating of the samples in a furnace coupled to an Atomic Absorption Spectrophotometer (AAS). It was shown that this method allows the identification of different redox states of Hg-species through their characteristic releasing temperature ranges. The method was applied to Hg-contaminated samples from an inactive chlor-alkali production plant in former East Germany (GER), and from a gold mining area in Poconé, Mato Grosso, Brazil (BRA), as well as synthetic soil samples obtained by spiking pre-heated soil matrices (GER and BRA) with the following mercury species: Hg0, Hg2Cl2, HgCl2, HgO and HgS. The samples GER, in general, frequently showed the presence of Hg2+ probably bound to humic substances, in the case of samples with higher total carbon content. Only in highly contaminated samples (〉3000 ppm of mercury) was Hg0 the predominant species. The samples BRA more frequently showed the presence of mercury species in the lower oxidation states, i.e. Hg1+ in combination with Hg0. The method allows observing changes in Hg-speciation in the samples with time, mainly changes among the oxidation states Hg0, Hg1+ and Hg2+. The treated GER matrix showed a stronger tendency to oxidise Hf-species than the BRA treated matrix, in which only added Hg0 is partially oxidised to Hg2+ and Hg1+. In contrast, the BRA matrix showed a pronounced tendency to reduce spiked Hg2+ to Hg1+. This may be the reason for the presence of Hg1+ in the majority of original BRA samples. The method appears to be very useful to study speciation of mercury and its dynamics. It can be used as a tool for monitoring mercury oxidation states and/or reactions of mercury in soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171644
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  • 7
    Electronic Resource
    Electronic Resource
    N-/P-pesticides in the Czech and German part of the river Elbe — Analytical methods and trends of pollution (1995)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 353 (1995), S. 70-74 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A GC/MS screening procedure and an analytical routine method with GC/NP-detection is described for N-/P-pesticides in the river Elbe. The GC/MS screening procedure allows the separate analysis of pesticides in suspended particulate matter (SPM) and water (centrifugate). For the pesticides identified only a negligible (〈1%) amount was bound to SPM compared to the “dissolved” amount in the centrifugate. N-/P-pesticide concentrations as time series and Elbe length-profiles are presented showing a drastical decrease of the pesticide pollution of the Elbe from 1989 to 1994. Major compounds were dimethoate, parathion-methyl, atrazine and simazine found in the μg/l range in the Elbe downstream of its tributary Mulde obviously stemming from a former East German pesticide production site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322892
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of humic substances on sorption and methylation processes of inorganic- and organo-tin species (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 9 (1995), S. 629-638 
    Details
    ISSN: 0268-2605
    Keywords: inorganic tin ; organotin compounds ; sediment ; humic acid ; fulvic acid ; methylation ; sorption ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of humic substances on sorption and methylation processes for inorganic- and organotin species is presented. Four sediment samples from different locations of the Rivers Elbe, Mulde and Spittelwasser, Germany, with different organotin and humic contents were selected to extract the humic and fulvic acids. The various fractions - the original sediment, the humic acid, the fulvic acid and the residual sediment - were analysed for their organotin content. The individual buyltin species show quite different distribution patterns. Monobutyltin is found mostly associated with humic acids. Dibutyltin shows a nonunique behaviour. At low total organotin content, dibutyltin is found bonded to humic and fulvic acids, whereas at high organotin content dibutyltin is distributed more with the residual sediment. Most of the tributyltin remains in the sediment unextracted; only small quantities of it are in the fulvic acid fraction. Tetrabutyltin is only in the humic acid fraction when it binds to humic matter; it mostly remains in the sediment. General observations indicate that ionic butyltin species bind to fulvic acids whereas the non-polar tetrabutyltin is not found in the fulvic acid fractions in any of the samples. The appearance of monomethyl- and dimethyl-tin species in the humic and fulvic acid fractions after the alkaline extraction was surprising. There is a correlation between the humic content of the sample and the formation of methyltin species. Evidence is provided by experiments that humic substances act as methylation agents.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590090719
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