Showing papers in "Marine Chemistry in 1995"

TL;DR: For example, in a recent paper as discussed by the authors, the authors investigated the mechanisms governing sedimentary organic matter preservation in marine sediments and found that organic preservation in the marine environment is < 0.5% efficient, and that the factors which directly determine preservation vary with depositional regime, but have in common a critical interaction between organic and inorganic materials over locally variable time scales.

TL;DR: In this paper, a voltammetric technique was developed to examine Fe speciation in seawater, which involves adding an Fe-III-complexing ligand, salicylaldoxime, which competitively equilibrates with inorganic and organic Fe(III) species in ambient seawater.

TL;DR: Experiments with coastal and oceanic phytoplankton clones representing different algal groups and cell sizes indicate that cellular iron uptake rates are similar among the species when rates are normalized to cell surface area.

TL;DR: In this article, the authors used 1-nitroso-2-naphthol (1N2N) as a complexing ligand to study Fe(III) speciation and the kinetic interaction of Fe3+ with naturally occurring organic ligands.

TL;DR: In this paper, a new electrochemical method, cathodic stripping voltammetry (CSV), is used to determine the speciation of iron in seawater originating from the Western Mediterranean taking advantage of ligand competition of an added electroactive ligand with the natural organic complexing matter to evaluate whether iron is organically complexed.

TL;DR: In this paper, the interaction of Fe(II) and Fe(III) with the inorganic anions of natural waters has been examined using the specific interaction and ion pairing models.

TL;DR: In this article, the authors used Principal Component Analysis (PCA) to provide a robust classification of biomarkers according to their primary source (e.g. terrigenous, marine) and to identify which biomarkers covary.

TL;DR: In this article, Wells et al. showed that the single largest reservoir of iron in the surface waters of HNLC regions may be the biota itself, and that the removal of iron from surface waters is fairly well constrained within a geochemical (i.e. mean residence time) perspective.

TL;DR: In this article, an analysis of the seasonal cycles of particulate and dissolved organic carbon and nitrogen was made, which revealed a mid-to late-summer accumulation of C-rich DOM, with C N ratios twice or more the Redfield value of 6.6.

TL;DR: In this article, a highly sensitive flow injection analysis (FIA) method for determining the concentration of iron in seawater has been developed, which is a modification of the catalytic batch method previously reported by Hirayama and Unohara.

TL;DR: In this paper, brine samples were collected from first year sea ice and analyzed for salinity, temperature, dissolved oxygen and major nutrient concentrations, showing that the net effect of freezing and melting on brine chemical composition was generally slight.

TL;DR: In this article, the estimates of atmospheric inputs of metals and nutrients to the oceans and some coastal areas are reviewed and the uncertainties in these estimates considered The evidence that these inputs significantly modify oceanic chemistry is presented However, there are still major uncertainties in our understanding of the interactions between the atmosphere and the ocean for these elements.

TL;DR: In this paper, the results of a dissolved organic carbon (DOC) method comparison are presented, in which five high temperature combustion (HTC) instruments and a wet chemical oxidation (WCO) method were used on a series of oceanic samples.

TL;DR: In this article, the reaction of dissolved Fe(III) with photochemically produced Superoxide radical (O 2 − ) was examined as a potentially important source of Fe(II) in sunlit seawater.

TL;DR: In this paper, two methods for the estimation of the complexation parameters according to the Langmuir isotherm are compared: the linear transformation of Van den Berg/Rǔzic and the non-linear method according to Wilkinson.

TL;DR: In this paper, the first direct measurements of photochemical iron reduction in natural seawater at pH 8 in a controlled laboratory setting were provided, showing that the peak concentration of Fe(II) ranged from 4 to 8% of the total iron concentration.

TL;DR: The distribution of organic C and trace elements (Cd, Cu, and Ni) between truly dissolved and colloidal phases was determined in May 1992, in order to better understand their behavior during estuarine mixing in the Rhone delta (France) as discussed by the authors.

TL;DR: In this paper, the vertical profiles for dissolved antimony, arsenic, and selenium were obtained at four stations in the eastern basins of the North and South Atlantic Ocean, and on a surface-water transect from 24 ° S to 31 ° N.

TL;DR: In this paper, the light-induced dissolution of three well defined Fe(III) (hydr)oxide phases with oxalate as reductant/ligand was investigated.

TL;DR: In this article, a thermodynamically-based model is presented which allows the estimation of both the Setchenow constant as well as the chemical activity coefficient of the compound in the sediment organic phase from experimental data.

TL;DR: In this article, a photochemical box model was used to calculate the isoprene concentration in the photic zone of the ocean and the marine boundary layer, and a supersaturation of surface seawater of 2 to 3 orders of magnitude was estimated.

TL;DR: In this article, the distribution of heavy metal was analyzed in water column particles collected in autumn (October 1985) and spring (March 1986) by two series of sediment traps from a mooring located in the northeastern Mediterranean Sea continental slope.

TL;DR: In this article, an overview of the ability of phytoplankton to passively adsorb and actively assimilate heavy metals from their aqueous environment and to release into the environment organic ligands capable of complexing metals is presented.

TL;DR: In this paper, the vertical profiles of fluorescent organic matter were studied at five stations in the equatorial Central Pacific and the linear relation between AOU and fluorescence intensity was found.

TL;DR: In this article, the authors investigated the mechanisms regulating the distribution of dissolved methane in North Pacific Ocean waters and found that the greatest supersaturations were found in coastal areas, where sediment and near-bottom inputs become important sources of methane to the water column.

TL;DR: In this paper, it is shown that iron(II) is effectively masked in the presence of 2,2-dipyridyl (Dp) so that the concentration of reactive iron (III) is measured selectively.

TL;DR: In this paper, the authors measured the concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in four sizes of suspended particles and in the dissolved phase in surface and bottom waters of the mesohaline Chesapeake Bay.

TL;DR: In this article, the same authors used the Chelate scale to determine the thermodynamic stability of iron(III) complexes with catecholate-type siderophores from the marine bacterium Alteromonas luteoviolacea and the marine cyanobacterium Synechococcus sp.

TL;DR: This article measured the concentration of dissolved organic carbon (DOC) in the equatorial Atlantic Ocean, using a high-temperature carbon oxidation technique and platinized-quartz catalysts.