Showing papers in "Marine Chemistry in 1987"

TL;DR: In this paper, the authors present a review of the different problems involved with sequential extraction techniques and specify the nature of their operation, showing that the specificity and the reproducibility of the method greatly depend upon the chemical properties of the element and the chemical composition of the samples.

TL;DR: An automated instrument for the detection of total carbon dioxide (TCO2) was developed from the manual prototype of Johnson et al. as discussed by the authors, which was used to calibrate the detector, the whole analytical procedure was controlled by a microcomputer, and the unit was compact enough for field and shipboard use.

TL;DR: In this article, a two-stage Au amalgamation gas train was used to introduce elemental Hg0 vapor into the gas cell of a flameless atomic absorption spectrophotometer.

TL;DR: The performance of extractants commonly used in the determination of acid volatile sulfide minerals (e.g.,morphous-FeS, mackinawite and greigite) and pyrite has been evaluated using pure mineral phases and anoxic sediments as discussed by the authors.

TL;DR: In this article, the distribution coefficient (λMg) of Mg2+ ions between calcite and solution was found to be 0.012 ± 0.001 (10°C), 0.014 + 0.003 (50°C) for aragonite, where the molar ratio lies in the range 0.04-2.

TL;DR: In this article, acid-volatile sulfide (AVS), pyrite-sulfur, iron and organic carbon distributions were examined in sediments from a variety of oxic and anoxic marine environments.

TL;DR: In this paper, a review of eolian input fluxes of lead from these atmospheric reservoirs to the Earth's surface for remote regions is given, as well as methods for estimating the proportions of natural and industrial lead in soil dust, sea salt, volcanic sulfate and anthropogenic particles in air and rain.

TL;DR: In this article, the authors provided additional data on dissolved concentrations obtained in polluted and so-called unpolluted river estuarine systems and compared them with the Chinese Yellow River (Huanghe) and Yangtze River (Changjiang) by differential pulse anodic stripping voltammetry.

TL;DR: Experimental data on anoxic freshwater sediments from the Hamburg harbor indicate that commonly performed storage and pretreatment methods including aeration by drying strongly change the original associations of heavy metals with different sediment components as discussed by the authors.

TL;DR: In this article, a potentiometric analytical method is proposed for the determination of the alkalinity of seawater, which is very easy to use, even on board ship since it is carried out in open flasks.

TL;DR: In this paper, a method was described to obtain the association constant of fluoride and hydrogen ions and its influence on the total and free ion concentration with an error of ± 0.05 for the salinity and temperature range 10 −40 and 9 −33°C, respectively.

TL;DR: A 10m long sediment core from Bransfield Strait, Antarctic region, has been examined for hydrocarbons, fatty acids, fatty alcohols, sterols, hopanoic acids, lignins and stable isotope ratios as mentioned in this paper.

TL;DR: In this paper, the fluorescence of North Carolina river samples observed simultaneously by scanning excitation and emission wavelengths at a fixed wavelength difference of 25 nm produced synchronous spectra characteristic of each sample's dissolved organic matter.

TL;DR: In this article, a new standardization method for glass electrodes is proposed for pH measurements on the NBS scale and an expression is obtained to evaluate the apparent activity coefficient of hydrogen ions as a function of salinity and temperature.

TL;DR: A liquid-liquid partition, ligand exchange procedure involving the formation of copper(II) complexes with acetylacetone is presented for the determination of stability constants and concentrations of copper chelators in seawater as discussed by the authors.

TL;DR: In this article, total vanadium concentration has been determined on 4 vertical profiles in the Atlantic Ocean, 4 in the Pacific and 2 in the Mediterranean Sea, and the respective mean concentrations are 35 ± 3, 32 ± 3 and 49 ± 4 nmol kg−1.

TL;DR: In this paper, a Scottish sea loch exhibit enrichment profiles for the minor metals Cu, Pb and Zn, and the source and diagenetic remobilisation of these elements are discussed with relation to the fate of anthropogenic metals in coastal sediments.

TL;DR: Organic geochemical measurements of the lipid fraction, comparing saturated and aromatic hydrocarbons, fatty acids, alcohols and sterols, have been carried out on six sediments cores collected from the Atlantic shelf, slope and the rise areas to evaluate the cross-shelf transport of the organic carbon.

TL;DR: Glyoxylate and pyruvic acids were formed when filter-sterilized seawater was exposed to solar radiation as mentioned in this paper, and the results showed that photochemical processes may also be important in the marine cycling of some biochemical compounds.

TL;DR: In this paper, the most important parameters influencing trace metal distribution in sediments are reviewed and accent is put on sedimentation rate, grain size distribution and the knowledge of past events through sedimentological and mineralogical parameters.

TL;DR: Tungsten depth profiles in oceanic waters have been analyzed in this article, showing that tungsten is removed from seawater much more rapidly than molybdenum, by adsorption onto ferric hydroxide, manganese oxide and clay minerals.

TL;DR: In this article, the distribution patterns of the investigated elements follow the expected geochemical partitionings, while minor variations may be caused by early diagenetic effects and variable sediment texture.

TL;DR: In this paper, the authors used graphite-furnace atomic absorption spectroscopy (AAS) for the determination of silver and cadmium in Puget Sound sediment cores for the first time.

TL;DR: Hering et al. as discussed by the authors performed a field comparison of two methods for the determination of copper complexation: bacterial bioassay and fixed-potential amperometry, and the results of this study support the validity of both techniques and the field applicability of fixedpotential AMPERometry.

TL;DR: In this article, the authors reported that sulfate reduction accounts for 5-26% of the estimated downward flux of organic matter to the seafloor sediments of the Gulf of St. Lawrence.

TL;DR: In this article, a solvent extraction method for measuring nanomolar concentrations of ammonium in seawater is described, based on formation of indophenol in alkaline solution by reaction of phenol, hypochlorite and ammonia using sodium aquopentacyanoferrate as a coupling agent.

TL;DR: These experiments suggest that bacterial populations in surface sediments are capable of utilizing all of the amino acid flux to the sediment-water interface in tropical mangroves.

TL;DR: In this paper, the concentration of chlorinated hydrocarbons (p, p′-DDT, DDD, DDE, polychlorinated biphenyls) and polycyclic aromatic hydrocarols (PAHs) were determined by GC, GC-MS and HPLC in the 15 sections of a 210Pb radiodated sediment core (50 cm length; 10 cm id) sampled in the lagoon of Venice.

TL;DR: The vertical distribution of natural fluorescence was investigated at one location in Sagami Bay, Japan and linear relations with negative slopes were found between salinity and Natural Fluorescence at several locations in Tokyo Bay.

TL;DR: In this article, the authors present results of hydrocarbon analyses of deep water profiles, sediments and their associated surface flocculent layers, and zooplankton samples collected in the western basin.