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Annual balances of hexachlorocyclohexanes, polychlorinated biphenyls and triazines in the German Bight
1997
Huhnerfuss, H. | Bester, K. | Landgraff, O. | Pohlmann, T. | Selke, K. (Institut fur Organische Chemie der Universitat Hamburg, Martin-Luther-King-Platz 6, D-20146 Hamburg (Germany))
Heavy metals in livers of bottlenose dolphins stranded along the South Carolina coast
1997
Beck, K.M. | Fair, P. | McFee, W. | Wolf, D. (National Marine Fisheries Service, Charleston Laboratory, 219 Ft Johnson Road, Charleston, SC 29422-2607 (USA))
Organochlorines and other environmental contaminants in muscle tissues of sportfish collected from San Francisco Bay
1997
Fairey, R. | Taberski, K. | Lamerdin, S. | Johnson, E. | Clark, R.P. | Downing, J.W. | Newman, J. | Petreas, M. (Moss Landing Marine Laboratories, Moss Landing, CA 95039 (USA))
Occurrence of the marine antifouling agent Irgarol 1051 within the Plymouth Sound locality: implications for the green macroalga Enteromorpha intestinalis
1997
Scarlett, A. | Donkin, M.E. | Fileman, T.W. | Donkin, P. (Plymouth Environmental Research Centre, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA (United Kingdom))
The determination by HPLC of PCB and p,p'-DDE residues in marine mammals stranded on the Oregon coast, 1991-1995
1997
Hayteas, D.L. | Duffield, D.A. (Department of Biology, Portland State University, Portland, Oregon 97207 (USA))
Accumulation pattern of persistent organochlorine residues in common cormorants (Phalacrocorax carbo) from Japan
1997
Guruge, K.S. | Tanabe, S. | Fukuda, M. | Yamagishi, S. | Tatsukawa, R. (Department of Environment Conservation, Ehime University, Tarumi 3-5-7, Matsuyama 790 (Japan))
Metals and organochlorines in tissues of a Blainville's beaked whale (Mesoplodon densirostris) and a killer whale (Orcinus orca) stranded in the United Kingdom
1997
Law, R.J. | Allchin, C.R. | Jones, B.R. | Jepson, P.D. | Baker, J.R. | Spurrier, C.J.H. (Ministry of Agriculture, Fisheries and Food, Fisheries Laboratory, Remembrance Avenue, Burnham-on-Crouch, Essex CM0 8HA (United Kingdom))
Effects of metals on the microbial mineralization of organic acids
1997
BRYNHILDSEN, LENA | Rosswall, T. (Thomas)
The effects of chemical speciation on mineralization of organic compounds was studied using citric acid as a model substance. The degradation of ¹⁴C-labeled Al-, Co-, Cu-, and Zn-citrate was followed in chemically well-defined media inoculated with mixed cultures of microorganisms (soil extracts from two soils). The degradation of citrate was completely inhibited when the acid was bound to Zn, Cu, or Co and partly inhibited when bound to Al. The mineralization of citrate as well as histidine was also followed by incubation of the complexes (Cu, Zn, Al) in the two soils. No effect of metals on the degradation of histidine was seen. The degradation of citrate in soils was also unaffected when complexed to Cu and Zn, whereas Al exerted an inhibited decomposition in both soils.
Show more [+] Less [-]The state of pollution levels of Karachi harbour and adjoining coastal water
1997
Akhtar, Waseem | Ali, Iqbal | Zaidi, S. S. H. | Jilani, Seema
A study was carried out recently to determine the pollution level of waters in the Karachi harbour and adjoining backwaters. Nine locations were selected, four in the backwaters, two on the seaside, and three in the main navigable channel. Four of these locations were deliberately selected to coincide with those of a previous study conducted in 1982 by Pakistan Council of Scientific and Industrial Research (PCSIR) so that the values for the concentration of different pollutants could be compared. Analysis was conducted for pH, bicarbonates, Total Solids, Volatile matter in Total Solids, Chlorides, Sulphates, Calcium, Magnesium, Sodium and Potassium.The results indicate that the composition of sea water as far as the concentration of above constituents is concerned has not changed much since the time of the PCSIR study, viz 1982, except that the organic matter concentration has increased. The reasons for this increase in organic loading and its possible impact are discussed in this paper.
Show more [+] Less [-]Evidence of recovery from acidification in Massachusetts streams
1997
Mattson, Mark D. | Godfrey, Paul J. | Walk, Marie-Françoise | Kerr, Peter A. | Zajicek, O Thomas
A ten year survey of water quality in 330 Massachusetts streams was conducted to examine the rate and pattern of recovery from acidification. Meta-analysis was used to combine the results of the 330 non-parametric trend tests into an overall test for trend in a variety of water quality variables including pH, acid neutralizing capacity (ANC), and major inorganic ions. Analysis of trends in the raw data indicates both pH and ANC are increasing. After detrending for variations in stream runoff, we estimate the streams are recovering from acidification at a rate of +0.021 pH units/year and +2.4μeq/L/year, for pH and ANC respectively. These trends appear to be related to declines in sulfate (−1.8μeq/L/year), while base cation trends were mixed. Meta-analysis reveals the trends are not always homogeneous between seasons or between sites.While it is commonly assumed that the low ANC systems are most ‘sensitive’ to changes in acid or base inputs, we found the greatest rates of change in ANC were associated with the high ANC systems. The greatest increases in pH were seen in the low ANC streams as expected. The results also suggest streams respond quickly to changes in precipitation inputs and stream monitoring networks may be valuable as an early detection technique for changes in environmental quality.
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