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  • 1
    Electronic Resource
    Electronic Resource
    Direct determination of geochronologically useful radionuclides in sediments by low-energy photon analysis
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 263 (1988), S. 529-536 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(88)90998-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Geochemistry of sediments in the back bay and Yellowknife Bay of the Great Slave Lake (1989)
    Springer
    Environmental geology 14 (1989), S. 35-42 
    Details
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Gold mining activities generated wastes with high concentrations of arsenic and zinc in the vicinity of Yellowknife, Northwest Territories, Canada. Some of the waste material has been discharged into Yellowknife Bay of Great Slave Lake. Concentrations of arsenic and zinc were determined in sediment cores collected at the depositional areas of Yellowknife Bay. Sedimentation rates were estimated using two different radiometric approaches: the depth profiles of Cs-137 and Pb-210. Geochemical composition of the sediment cores indicated input of similar material into sampling areas over the past 50 years. Age profiles of the sediment constructed from the radionuclides measurements were used to determine historical trends of arsenic and zinc inputs into Yellowknife Bay. The historical record was in good agreement with implemented remedial actions and usage patterns of both elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740583
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Environmental status of several Shubenacadie River headwater lakes, Nova Scotia, Canada (1987)
    Springer
    GeoJournal 14 (1987), S. 311-317 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract The Shubenacadie River basin is the largest watershed in Nova Scotia, Canada, encompassing an area of approximately 2,800 km2 and supporting one of the most rapidly expanding populations in Atlantic Canada. A comprehensive study was carried out to assess the effect of recent development in the basin on the headwater lakes. Information on the environmental status of the lakes can be further used in the development of a management framework for the basin with respect to water quality and quantity objectives. Water and sediment quality were investigated in four of the Shubenacadie River headwater lakes. In addition, trophic status of the lakes was assessed by using dissolved phosphorus and oxygen concentrations. The surface area and mean depth of the lakes ranged from 0.83 to 1.13 km2 and 4.3 to 6.6 m, respectively. Three of the studied lakes were thermally stratified during the summer. The concentration of dissolved oxygen decreased significantly in the hypolimnion during the stratification period, although the lakes were generally classified as oligotrophic. The water quality is typical for lakes of the area. The pH of the water ranged between 6.1 and 7.3 during the study period. Major ions were chloride, sodium, and sulphate. A significant increase of As, Hg, Zn, Pb, Cu, Ni and Co was found in surface sediments in all four lakes. However, the concentration of these elements in lake water was lower than recommended guidelines for aquatic life and human consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00208204
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of contaminated sediments and standard elutriates on primary production in Lake Ontario (1989)
    Springer
    Water, air & soil pollution 45 (1989), S. 275-286 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A comparison of elutriate and sediments effects on phytoplankton photosynthesis was undertaken in view of the widespread use of sediment elutriates in bioassays. The logistic problem of measuring 14C in the presence of sediments was overcome by extracting 14C labelled photosynthate with DMSO. In Lake Ontario, sediments were more inhibitory than elutriates to photosynthesis, depressing Pmax, the light saturated photosynthesis by up to 50%. The less severe toxicity of elutriates is attributed mainly to binding and removal from solution of metals with phosphate, although phosphate rich elutriates may also allow algae to accumulate polyphosphate which binds, and thus detoxifies metals inside the cells. Also, any hydrophobic organic contaminants present in the sediments and toxic to algae are not likely to be extracted into elutriates. In P deficient phytoplankton populations, the high concentrations of phosphate in elutriates may lead to a temporary depression of photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283458
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  • 5
    Electronic Resource
    Electronic Resource
    LEAFS determination and concentration of metals in Great Lakes ecosystem (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 336-339 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A Laser-Excited Atomic Fluorescence Spectrometric (LEAFS) method for Tl determination has been extended to investigate the direct determination (without preconcentration nor acid digestion) of total Pb, for which the method validation was successfully achieved by using a standard reference material as well as many spike recoveries of digested and undigested unfiltered water samples. The method was applied to study total and dissolved Pb in many water columns collected from different stations in Lake Ontario. Dissolved Pb was found to be about twice as much as dissolved Tl, and total Pb about seven times higher than total Tl. Seventy five percent of Pb is in particulate form versus 11% for Tl. Also, a simple cold dissolution procedure using HNO3 and HF (not a hot acid digestion) is proposed to “liquefy” sediments in a form suitable for LEAFS analysis and was used to analyze a sediment core, where pore water samples were also collected. The interaction dynamics of Tl within the natural environment of a water/pore water/sediment system from Lake Erie was assessed. The calculations of fluxes suggest a strong similarity between Tl and Cd geochemical transport. The paper also presents for the first time a genuine sediment pore water profile of Tl concentration, which ranged from sub- to 40 ng/l and which was directly determined by LEAFS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550336
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  • 6
    Electronic Resource
    Electronic Resource
    Application of chemometrics in homolog-specific analysis of polychlorinated biphenyls (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 747-754 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, high resolution ; Chemometrics ; Principal component analysis ; K-nearest neighbor ; PCB-homolog specific analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A principal components multivariable statistical method based on SIMCA 3B (Soft Independent Method of Class Analogy) algorithms was evaluated and applied to interpretation of homolog-specific analysis of polychlorinated biphenyls by high resolution gas chromatography. High resolution gas chromatograms can be evaluated in high resolution separations of individual PCB isomers and grouped into the homologous series. The chromatograms show distinct differences between PCB compositions with different contents of chlorine atoms in technical mixtures (Aroclors). The objective of utilizing SIMCA 3B was its evaluation for a possible identification, classification, and categorization of Aroclors in environmental samples.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240081110
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of plant material by X-ray fluorescence spectrometry (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 6 (1977), S. 215-217 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: To get a better understanding of chemical changes accompanying reproduction, maturation and senescence of plants, plant samples collected in various marshes were analysed by X-ray fluorescence spectrometry for Na, Mg, Al, Si, P, K, Ca, Ti, Mn and Fe with sufficiently accurate results. The preparation of pellets from unground, coarse and finely ground plant material was investigated and no significant difference was found in X-ray count rates. A computer program was developed for routine analyses of plant material using NBS standard Orchard Leaves.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300060412
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