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  • 1995-1999  (4)
Document type
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Integrated Biological and Chemical Monitoring: In situ Physiological Responses of Freshwater Crayfish to Fluctuations in Environmental Ammonia Concentrations (1999)
    Springer
    Ecotoxicology 8 (1999), S. 225-237 
    Details
    ISSN: 1573-3017
    Keywords: Ammonia ; in situ monitoring ; crustacea ; heart rate ; flow injection ; landfill leachate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A portable, computer-aided physiological monitoring system (CAPMON) has been integrated with an automated, flow injection (FI) based chemical monitor to enable continuous, long-term recording of cardiac activity in selected aquatic organisms, and total ammonia concentration in the surrounding environment. Heart rate of the freshwater crayfish Pacifastacus leniusculus was recorded using non-invasive infrared emitter/detectors to transduce heart beat from 4 animals simultaneously. Data were collected continuously and stored on a laptop computer. The chemical monitor incorporated a gas diffusion unit and a solid state photometric detector. Remote control and data processing were accomplished using an in-house designed microcomputer. The instrumentation was fully evaluated in the laboratory and the field and was shown to be capable of operating unattended for periods of at least 1 week. An exposure-response experiment showed that 4 h exposures to concentrations of ammonia greater than 5 mg l-1 had a significant stimulatory effect on heart rate (ANOVA F=7.6; df=5; P〈0.0005). The feasibility of using the system in situ was demonstrated in a 2 week field trial in which the integrated monitors were successfully deployed at a landfill leachate lagoon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026400532305
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Development of a simple extraction procedure using ligand competition for biogeochemically available metals of estuarine suspended particulate matter (1999)
    Elsevier
    In:  Analytica Chimica Acta, 392 (1). pp. 3-17.
    Details
    Publication Date: 2017-05-30
    Description: Sorption of trace metals by suspended particulate matter (SPM) in estuarine systems has important implications for the fate of dissolved metals in these waters. This paper describes the development of a single extraction procedure for SPM-associated trace metals, using a ligand competition approach with EDTA as the added complexing ligand. The use of EDTA allows the determination of available particulate trace metals using well defined constraints with respect to the competition for trace metals between EDTA and the particles. Incubation experiments showed that equilibrium times between EDTA and particulate material of 72h were required to reach equilibrium for most of the metals studied (Cu, Zn, Mn, Ni, Co, Al, Fe, Pb and Mg). Optimum conditions included a 0.05M EDTA concentration and the use of an extractant: particulate matter ratio of 200:1 (v:w). Kinetic calculations on data from the incubation experiments were used to calculate the apparent stability constants (K(MeS)) for the metal-particulate matter interaction and indicated values ranging from 10-2.1 for K(MgS) to 10-13.5 for K(CuS). Copyright (C) 1999 Elsevier Science B.V.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0003-2670(99)00285-8
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Determination of sub-nanomolar levels of iron in seawater using flow injection with chemiluminescence detection (1998)
    Elsevier
    In:  Analytica Chimica Acta, 361 (3). pp. 189-200.
    Details
    Publication Date: 2014-02-03
    Description: The development of a highly sensitive system for the shipboard determination of dissolved iron at the sub-nM level is presented. The technique is based on a flow injection method coupled with luminol chemiluminescence detection. Dissolved Fe(II+lII) levels are determined after Fe(III) reduction using sulphite and in-line matrix elimination/preconcentration on an 8-hydroxyquinoline (8-quinolinol) chelating resin column. The detection limit (3s) is 40 pM when 1.5 ml of sample is loaded onto the column, and the relative standard deviation is 3.2 (n=5) for a 1.0 nM Fe sample. One analytical cycle can be completed in 3 min. The automated method proved reliable when employed on-board the RRS James Clark Ross during Autumn 1996, mapping dissolvable Fe(II+III) levels along the Atlantic Meridional Transect from 50°N to 50°S. Data from vertical profiles through the upper water column are presented.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0003-2670(98)00015-4
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Validation and in situ application of an automated dissolved nickel monitor for estuarine studies (1998)
    Elsevier
    In:  Analytica Chimica Acta, 377 (2-3). pp. 217-228.
    Details
    Publication Date: 2014-02-03
    Description: The validation of a fully automated dissolved Ni monitor for in situ estuarine studies is presented, based on adsorptive cathodic stripping voltammetry (AdCSV). Dissolved Ni concentrations were determined following on-line filtration and UV digestion, and addition of an AdCSV ligand (dimethyl glyoxime) and pH buffer (N-2-hydroxyethylpiperazine-N'-2-ethanesulphonic acid). The technique is capable of up to six fully quantified Ni measurements per hour. The automated in situ methodology was applied successfully during two surveys on the Tamar estuary (south west Britain). The strongly varying sample matrix encountered in the estuarine system did not present analytical interferences, and each sample was quantified using internal standard additions. Up to 37 Ni measurements were performed during each survey, which involved 13h of continuous sampling and analysis. The high resolution data from the winter and summer tidal cycle studies allowed a thorough interpretation of the biogeochemical processes in the studied estuarine system. Copyright (C) 1998 Elsevier Science B.V.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0003-2670(98)00622-9
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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