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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal, geographical and size-induced variability in mercury content of Mytilus edulis in an estuarine environment: a re-assessment of mercury pollution level in the Estuary and Gulf of St. Lawrence (1985)
    Springer
    Marine biology 88 (1985), S. 43-49 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal variability of mercury content of Mytilus edulis (L.) was studied at monthly intervals for 18 mo (June 1978–December 1979) in a natural population from a typical estuarine environment (St. Lawrence Estuary). Body-size-induced variability was observed in the same population in spring 1980. The regression coefficients of log-log relationships between mercury content and body size of the mussels varied with time. However, the regression coefficients were never higher than 1; this indicates, therefore, no net accumulation of mercury with age of the bivalve. A normalization method, taking into account shell length and soft-tissue dry weight, is proposed to minimize the metal variations due to size differences of the mussels. The normalized mercury contents vary seasonally by a factor of two. Minimum values were observed during summer. This factor (2) is taken as the minimal difference which can be accepted as indicating a significant geographical trend in a “mussel watch”-type study in estuarine environments. In the St. Lawrence Estuary and Gulf, size-normalized concentrations range from 69 to 378 ng Hg g-1 (dry weight); highest levels were observed in areas where freshwater influence is maximum, while lower contents were encountered in regions of highest Atlantic influence. In the Gulf, mercury in mussel soft tissue is 3x104 times that of the seawater. There is some indication of a decrease in the previous measured levels near the mouth of the Saguenay fjord in the Lower St. Lawrence estuary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393042
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  • 2
    Electronic Resource
    Electronic Resource
    Sorption du cadmium par une population de la diatomée Phaeodactylum tricornutum en culture (1976)
    Springer
    Marine biology 34 (1976), S. 163-167 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The uptake of cadmium by the marine diatom Phaeodactylum tricornutum (Bohlin) maintained in batch culture was measured as a function of successive growth stages of the diatom, and of the chemical form of cadmium in the culture medium (10 μg Cd.l-1). The relative importance of adsorption and absorption of cadmium by the diatom was evaluated. When cadmium was chelated by ethylenediaminetetraacetate (EDTA) the uptake was negligible. In the absence of a chelating agent the uptake varied with the growth phase of the culture, and the major part of the uptake was by adsorption. Two opposite phenomena seen to be responsible for the processes observed: adsorption of cadmium on the cell walls followed by a gradual elution (desorption) by external metabolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390758
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  • 3
    Electronic Resource
    Electronic Resource
    Geographical and seasonal variations in the relationship between trace metal content and body weight in Mytilus edulis (1980)
    Springer
    Marine biology 58 (1980), S. 7-14 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between trace metal content (Cd, Cu, Fe, Mn, Ni and Zn) and body weight of Mytilus edulis L. show that smaller mussels are richer in trace metal than larger ones. According to the metal, the season and the locality examined, 3 types of relationships were obtained: (1) straight lines over the whole size range of mussels; (2) curves with steeper slopes in larger mussels and (3) curves with lowering slopes in larger mussels. For most metals the slopes changed from one locality to another. A detailed analysis of the relationship between Cd content and body weight showed a gradual decrease in metal content until maturity was reached, thereafter the relationship varied significantly with the season, and 2 different types of curves were obtained. Thus, our results contradict the idea that slopes are uniform for a given metal and species. Multivariate analyses showed that weight accounted for most of the variance in metal content while age and gonad maturation explained little of the variance observed. We propose the metabolic changes associated with sexual maturity and season continually change the relative importance of the circulating and storage compartments of metals and may be responsible for the variations of slope observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386873
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  • 4
    Electronic Resource
    Electronic Resource
    Polynuclear aromatic hydrocarbons in mussels from the estuary and northwestern gulf of St. Lawrence, Canada (1983)
    Springer
    Bulletin of environmental contamination and toxicology 31 (1983), S. 41-47 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01608764
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  • 5
    Electronic Resource
    Electronic Resource
    The distribution of dissolved and particulate mercury in three Siberian estuaries and adjacent Arctic coastal waters (1995)
    Springer
    Water, air & soil pollution 80 (1995), S. 653-664 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Dissolved and particulate mercury distributions were determined in the three largest Siberian rivers and in adjacent Arctic coastal waters during two cruises. Water samples were collected in the Lena River and its mixing zone in the Laptev Sea in September 1991, and in the Ob and Yenisei Rivers and the adjacent Kara Sea in September 1993. Average total dissolved Hg concentration was 5.0 pM in the Lena River, 2.8 pM in the Ob River and 1.5 pM in the Yenisei River. Mercury content of suspended particulate matter was low, averaging 0.17 mg kg−1 in the Lena and 0.05 mg kg−1 in the Ob and Yenisei Rivers. These concentrations are lower than those observed in other world rivers affected by local input of man-made origin. In the estuarine mixing zones, higher concentrations of dissolved and particulate Hg which may originate from the spring flood were found. The carbon cycle is apparently a driving mechanism for Hg distribution in Arctic coastal waters. Particulate Hg content was positively correlated with the content of organic matter of the particles. In the Kara Sea, uptake by phytoplankton is suspected to be responsible for the increase in particulate Hg levels. Mercury fluxes from the three rivers to the Arctic Shelf are estimated and compared to direct atmospheric inputs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189718
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  • 6
    Electronic Resource
    Electronic Resource
    Automated mercury determination in waters (1995)
    Springer
    Water, air & soil pollution 80 (1995), S. 1279-1284 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A rapid technique for dissolved Hg determination in water at ultra-trace level is described. It consists of the automatisation of the cold-vapor/gold amalgamation/atomic fluorescence technique, which allows the determination of 8 samples per hour with an analytical precision of 5 % and a 0.1 ng.l−1 detection limit for a 45 ml sample. It is suitable for Hg determination in most of the natural waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189791
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  • 7
    Electronic Resource
    Electronic Resource
    An international intercomparison exercise for total mercury in seawater (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 4 (1990), S. 49-54 
    Details
    ISSN: 0268-2605
    Keywords: Intercomparison ; mercury ; methyl mercury ; seawater ; analysis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Deux échantillons de 30 dm3 d'eau de mer côtiére ont été prélevés en september 1983. L'un d'eux a été acidifié, homogénéisé et réparti dans 50 ampoules de 500 cm3. L'autre, aprés ajout de 612 ng de mercure sous forme de chlorure de méthylmercure, a été acidifié, homogénéisé et réparti dans 50 ampoules indentiques. Ces opérations ont été effectuées sous atmosphere purgée de mercure. Un lot de chacun des échantillons a été expédié à 37 laboratoires dont 21 ont fourni des résultats concernant la teneur en mercure ‘total’. Les valeurs de consensus et leur intervalle de confiance sont respectivement de 6,0 ± 1,6 et 24,2 ± 2,8 ng dm-3 pour l'échantillon naturel et le dopé. Onze laboratoires rapportent des résultats quantitatifs fiables (écart 〈 ± 2s) pour l' échantillon naturel (sans ajout) et douze pour l'échantillon dopé. De plus, dix laboratoires présentent des paires de résultats groupés à moins de deux écarts type des valeurs de consensus. Le stockage, même pendant quatre mois, d'échantillons d'eau de mer en présence d'acide nitrique (0,3 mol dm-3) est, à lui seul, un traitement insuffisant pour libérer le mercure sous sa forme monométhylée.
    Notes: Two 30 dm3 coastal seawater samples were collected in September 1983. One was acidified, homogenized and divided among 50 500-cm3 glass ampoules. The second was spiked with 612ng of mercury added as methylmercury chloride, acidified, homogenized and divided among 50 500-cm3 glass ampoules. All these operations were performed under a mercury-free atmosphere. A single sample from each set was sent to each of 37 laboratories; 21 of them submitted their results of a ‘total’ mercury concentation determination. The consensus values and their confidence limits are 6.0 ± 1.6 and 24.2 ± 2.8 ng dm-3 for the natural and the spiked samples respectively. Eleven laboratories reported reliable quantitative results (within ± 2SD) for the natural (unspiked) sample, and 12 for the spiked sample. In addition, ten laboratories give sets of results within ± 2SD of the consensus values. Storage for up to four months of methylmercury spiked samples with 1.4% nitric acid (0.3 mol dm-3) at room temperature is, alone, an unsuitable treatment for releasing mercury from its monomethyl compounds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590040109
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  • 8
    Electronic Resource
    Electronic Resource
    An international intercalibration for methylmercury in biological tissue (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 3 (1989), S. 257-266 
    Details
    ISSN: 0268-2605
    Keywords: mercury ; methylmercury ; intercalibration ; biota ; analysis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An intercalibration exercise between 13 laboratories from seven countries was conducted for comparing the methylmercury measurement techniques for marine biological tissues. Analyses have been conducted on two sets of samples: a fish muscle and a mussel soft tissue. Most of the participating laboratories performed six replicate analyses, allowing statistical comparisons. Various analytical techniques have been used, including cold vapour atomic absorption spectrophotometry (CVAA), electron capture gas liquid chromatography (GCEC), neutron activation (NAA), and inductively coupled plasma-isotopic dilution mass spectrometry (ICPIDMS). All of these methods offer similar results. They allow us to define consensus values which seem good estimates of the real concentrations. In addition the results show, for most of the participating laboratories, good accuracy and precision in the determination.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590030309
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  • 9
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    Methylmercury formation in the anoxic waters of the Petit-Saut reservoir (French Guiana) and its spreading in the adjacent Sinnamary river (2003)
    EDP Sciences
    Details
    Publication Date: 2003-05-01
    Print ISSN: 1155-4339
    Electronic ISSN: 1764-7177
    Topics: Physics
    Published by EDP Sciences
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  • 10
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    Historical Records of Mercury, Lead, and Polycyclic Aromatic Hydrocarbons Depositions in a Dated Sediment Core from the Eastern Mediterranean (2013)
    American Chemical Society
    Details
    Publication Date: 2013-06-17
    Print ISSN: 0013-936X
    Electronic ISSN: 1520-5851
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by American Chemical Society
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