Effect of in situ exposure history on the molecular responses of freshwater bivalve Anodonta anatina (Unionidae) to trace metals

Thousands of pollutants are threatening our water supply, putting at risk human and environmental health. Between them, trace metals are of significant concern, due to their high toxicity at low concentrations. Abandoned mining areas are globally one of the major sources of toxic metals. Nowadays, no method can guarantee an immediate response for quantifying these pollutants. In this work, a novel technique based on microwave spectroscopy and planar sensors for in situ real-time monitoring of water quality is described. The sensors were developed to directly probe water samples, and in situ trial measurements were performed in freshwater in four polluted mining areas in the UK. Planar microwave sensors were able detect the water pollution level with an immediate response specifically depicted at three resonant peaks in the GHz range. To the authors’ best knowledge, this is the first time that planar microwave sensors were tested in situ, demonstrating the ability to use this method for classifying more and less polluted water using a multiple-peak approach.

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In situ measurement of trace metals in lakewater using the dialysis and DGT techniques

Analytica Chimica Acta ◽

10.1016/s0003-2670(00)00946-6 ◽

2000 ◽

Vol 418 (1) ◽

pp. 53-68 ◽

Cited By ~ 75

Author(s):

Maria Catalina Alfaro-De la Torre ◽

Pierre-Yves Beaulieu ◽

André Tessier

Keyword(s):

Trace Metals ◽

In Situ Measurement

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The control of hydrogen sulfide on benthic iron and cadmium fluxes in the oxygen minimum zone off Peru

10.5194/bg-2019-390 ◽

2019 ◽

Author(s):

Anna Plass ◽

Christian Schlosser ◽

Stefan Sommer ◽

Andrew W. Dale ◽

Eric P. Achterberg ◽

...

Keyword(s):

Hydrogen Sulfide ◽

Trace Metals ◽

Pore Water ◽

Oxygen Minimum Zone ◽

Benthic Fluxes ◽

Benthic Chamber ◽

Bottom Waters ◽

Minimum Zone ◽

Oxygen Minimum

Abstract. Sediments in oxygen-depleted marine environments can be an important sink or source of bio-essential trace metals in the ocean. However, the key mechanisms controlling the release from or burial of trace metals in sediments are not exactly understood. Here, we investigate the benthic biogeochemical cycling of Fe and Cd in the oxygen minimum zone off Peru. We combine bottom water profiles, pore water profiles, as well as benthic fluxes determined from pore water profiles and in-situ from benthic chamber incubations along a depth transect at 12° S. In agreement with previous studies, both concentration-depth profiles and in-situ benthic fluxes indicate a Fe release from sediments into bottom waters. Diffusive Fe fluxes and Fe fluxes from benthic chamber incubations are roughly consistent (0.3–17.1 mmol m−2 y−1), indicating that diffusion is the main transport mechanism of dissolved Fe across the sediment-water interface. The occurrence of mats of sulfur oxidizing bacteria on the seafloor represents an important control on the spatial distribution of Fe fluxes by regulating hydrogen sulfide (H2S) concentrations and, potentially, Fe sulfide precipitation within the surface sediment. Removal of dissolved Fe after its release to anoxic bottom waters is rapid in the first 4 m away from the seafloor (half-life

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