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  • 2000-2004  (2)
  • dew  (1)
  • heavy metals  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of Organic Acids in Dew Collected on Surrogate Surfaces (2000)
    Springer
    Journal of atmospheric chemistry 37 (2000), S. 231-244 
    Details
    ISSN: 1573-0662
    Keywords: dew ; formate ; acetate ; Henry's law constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Levels of formate and acetate in dew were measured at Dayalbagh, India, usingsurrogate surfaces. The dew formed per night ranged between 0.06 lm−2 and 1.38 l m−2, with an average of 0.59l m−2. pH ranged between 6.7 and 7.4. Mean concentrations offormate and acetate in dew were 10.2 ± 10.2 μeql−1 and 7.5 ± 4.5 μeq l−1,respectively. The correlation coefficient between the two ions was 0.80 (p =0.001), which suggested that concentrations of these species in dew are linkedtogether. They have either common or different sources with fairly constantstrengths or products of same reaction. Good correlation of formate andacetate with Ca (r = 0.82 and r = 0.70, respectively) and Mg (r = 0.74 and r= 0.71, respectively) suggested that these ions may be associated with Ca andMg after the neutralization process. Deposition rates for formate and acetatein dew per night were 10.2 ± 7.22 μmol m−2 pernight and 4.6 ± 2.2 μmol m−2 per night,respectively. The theoretical Henry's law constant (K* H)and the field-observed Henry's law coefficient (K* H) ascalculated from concurrent measurements of gas phase and dew for both acidsshowed large discrepancies of three orders of magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006468417096
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Heavy Metal Transport from Dredged Sediment Derived Surface Soils in a Laboratory Rainfall Simulation Experiment (2000)
    Springer
    Water, air & soil pollution 118 (2000), S. 73-86 
    Details
    ISSN: 1573-2932
    Keywords: heavy metals ; leaching ; mobility ; surface runoff ; percolation ; rainfall
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Heavy metals in dredged sedimentdisposal sites may be transported through runoff andpercolation. In the present study metal fluxes byrunoff and percolation were determined under simulatedrainfall at a slope of 19% and a rainfall intensityof approximately 40 mm h-1. These circumstancescorrespond to half the mean annual erosivity of rainunder Belgian weather conditions. Surface runoff andpercolating water samples were analysed for suspendedsolids, total dissolved carbon and Cd, Cr, Cu, Ni, Pb and Zn.Runoff rate and sediment yields were highest for asilt loam sediment, characterised by a low clay andorganic matter content. Metal concentrations in runoffand percolating water varied widely between thesediments studied and were related to the total metalcontent in the sediment. In runoff and percolatingwater from the contaminated sediments, metalconcentrations strongly exceeded the Netherlands Areference values for ground water quality. Very highmetal fluxes were observed for the recently oxidiseddredged sediment. Metal transport per unit surfacearea through percolating water was from two to morethan twenty times greater than that in surface runoff.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005140726372
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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