Showing papers in "Marine Chemistry in 1983"

TL;DR: Using a refined two-stage gold amalgamation preconcentration technique in conjunction with cold vapor atomic absorption (CVAA) detection, mercury in various Pacific Northwest coastal waters has been determined through the use of extremely clean reagents and special handling techniques, the blank has been reduced and reproducibility greatly improved for both reducible mercury and total mercury as discussed by the authors.

TL;DR: In this paper, a gas lift pump and a 1500-1 extraction facility were used to extract fulvic and humic acids from near surface seawater samples obtained at five biologically diverse sites in the Gulf of Mexico in quantities sufficient for detailed NMR and chemical studies.

TL;DR: The major and minor element profiles for interstitial waters recovered from the oxygen-minimum zone of the Gulf of California are presented in this article, where the major elements and nutrients show concentration-depth profiles typical for anoxic, laminated sediments, with sulfate-reduction occurring close to the sediment-water interface, accompanied by increases in alkalinity and ammonia.

TL;DR: In this paper, a model for quantifying the biological impact of particulate-bound metals in estuaries is proposed, which is strongly influenced by the partitioning of metals among sediment components at the oxidized sediment interface.

TL;DR: In this paper, a detailed profile of anoxic Baltic waters was used to determine the solubility of Zn, Cd, Cu, Ni, Co, Fe, and Mn in the presence of bisulfide and polysulfide complexes.

TL;DR: A thermodynamic model based on measured steady state levels of H2O2 in the photic zone indicates that a significant proportion of total dissolved Cu is present as Cu(I).

TL;DR: In this article, total arsenic, arsenate and arsenite concentration profiles for the water column of Saanich Inlet, an intermittently anoxic fjord located on Vancouver Island, B.C., Canada, were measured using independent analytical techniques for total arsenic and arsenic speciation to evaluate the accuracy of the speciation technique in both oxic and anoxic marine environments.

TL;DR: In this article, the authors reported that 35% to 85% of the total near-bottom organic carbon flux is utilized at or near the sediment-water interface in marine environments, where bottom feeders and infauna are less abundant and more likely to irrigate rapidly accumulating sediments.

TL;DR: In this paper, the apparent ionization constants for silicic acid, k 1 and k 2, and the ionic product of water, k w, have been determined in 0.0 M Na(CI) media at 25°C.

TL;DR: The fatty acid pattern there was similar to that during the stationary phase of the phytoplankton bloom in the upper layer, and the biochemical composition changed and the fatty acid concentration increased sharply from about 3 to 20 μmol C dm − finally to about 30% of the particulate carbon.

TL;DR: In this article, the long-term uptake rate of Mn2+ on the surface of calcite in seawater is first order with respect to the dissolved Mn 2+ concentration.

TL;DR: In this article, the concentrations of nickel, copper, zinc and cadmium have been determined in the water of the northwest Atlantic Ocean between 45° and 60°N, and the vertical distributions of Ni, Zn and Cd show depletion in surface waters and a general correlation with nutrients indicative of biogeochemical cycling of these metals.

TL;DR: In this article, seasonal variations in copper mixing curves appear to be due to variations in river concentrations and their rate of discharge, which may explain the non-conservability of dissolved copper during transport from rivers through southeastern U.S. estuaries.

TL;DR: The second-order dependence on [OH−], found by several investigators for synthetic solutions, was confirmed in seawater, but only for pOH > 6.9, corresponding to the natural pH of seawater as discussed by the authors.

TL;DR: A time-series sediment trap was used to collect material for organic geochemical analyses as part of the Sediment Trap Intercomparison Experiment as discussed by the authors, where Amino acid and lipid components were measured in the samples.

TL;DR: In this paper, metal-organic complexes were isolated from coastal seawater by adsorption onto octadecyl-bonded silica (SEP-PAK cartridges) and injected into a high-performance liquid chromatograph.

TL;DR: In this article, the authors used riboflavin, a constituent of the dissolved organic matter (DOM), as a reference photosensitizer to define a photosensitizing efficiency (PSE) of seawater samples.

TL;DR: In this paper, self-diffusion coefficients of five major ions have been determined by a radioactive tracer method (capillary tube method) in seawater of salinity 34.86 at 25°C.

TL;DR: During the spring plankton bloom (1976) in the northern North Sea the fatty acid and lipid distribution of the chloroform extractable fraction of seawater was analyzed by gas chromatography and thin-layer chromatography, and the triacylglycerol fraction appears to be more stable than the other fraction in the water column.

TL;DR: In this article, water samples from a Pacific Ocean basin have been analyzed for a number of forms of chromium, almost entirely as dissolved Cr(VI), steadily increases with depth and correlates most closely with silica data.

TL;DR: In this article, the AMICON DIAFLO ultrafilters were analyzed for dissolved selenium with and without oxidation by irradiation with ultraviolet (UV) light and for dissolved organic carbon (DOC).

TL;DR: In this paper, an uncomplicated sampling technique for ultratrace element analysis of coastal and surface seawaters (maximum depth 100 m) is described, where interchangeable 500-ml Teflon bottles are used as both sampling and storage vessels.

TL;DR: The solubility of 7 Be from air particulate matter in seawater was determined as a function of time as mentioned in this paper, and the adsorption of the thus solubilized 7 Be on a variety of substrates was investigated.

TL;DR: In this article, the ability of electroanalytical techniques such as anodic stripping voltammetry and potentiometric stripping analysis to detect the low concentrations of heavy metals reported in open ocean waters is examined.

TL;DR: In this article, Pentachlorophenol (PCP) and 3,4-dichloroaniline (DCA) were used as models to examine photochemical reactions in seawater.

TL;DR: In this paper, the potential of a Pt electrode (EPt) in natural marine sediments is compared with other redox data, and it is shown that the EPt values can be considered only as relative redox characteristics.

TL;DR: The copper complexing capacity of coastal seawater ranges from 3 to 80 nM with the euphotic zone usually having values of 5-10 nM as mentioned in this paper, where one would expect chemical or biochemical degradation of organic detritus.

TL;DR: In this article, the concentration of cadmium, copper, lead, nickel and zinc were determined by atomic absorption spectroscopy after separation/concentration using two different extraction methods.

TL;DR: In this paper, the Pitzer model was used to calculate the gypsum solubility in mixtures of Dead Sea and Mediterranean Sea waters at different ratios and in their concentrates obtained by evaporation simulation.