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1.
A. A. Vetrov N. V. Lobus A. N. Drozdova N. A. Belyaev E. A. Romankevich 《Oceanology》2018,58(2):198-204
The methane content in water and bottom sediments was measured in vertical sections: Lena River Delta–continental slope (the Laptev Sea), Taimyr Peninsula–Voronin Trough, and along the Novaya Zemlya Archipelago. The methane concentrations varied from 2.5 to 70 nmol/L and from 590 to 2600 nmol/L in the water column and sediments, respectively. Most of the surface water samples showed oversaturation in methane (up to 19-fold, fourfold on average), which determined the water–atmosphere direction of methane fluxes, which amounted to 1–400 mol/km2 day (52 mol/km2 day on average). 相似文献
2.
G. V. Novikov N. A. Shulga N. V. Lobus O. Yu. Bogdanova 《Lithology and Mineral Resources》2020,55(1):55-62
Data on the mineral and chemical composition of samples of sulfide deposits from the Broken Spur and TAG (Mid-Atlantic Ridge) are presented. The main minerals in the Broken Spur field are marcasite, pyrrhotite, pyrite, chalcopyrite, and sphalerite; in sample from TAG: chalcopyrite, pyrite, and marcasite. It has been established that these sulfide minerals of Fe, Cu, and Zn are natural ion exchangers and belong to the class of adsorbents. Exchange capacity of sulfide minerals in terms of heavy metal cations (Ni2+, Co2+, Cd2+, and Pb2+) is 0.022–0.32 mg-equiv/g. In the exchange reaction products, the mineral composition of sulfide deposits is retained, and new phases do not appear. It is suggested that the adsorbed heavy metal cations populate either vacant cationic or interstitial defect sites in the structures of sulfide minerals. Bond strength of the adsorbed heavy metal cations with the main structural elements of minerals is low, which is confirmed by their high extraction in an acid medium. The results of adsorption-desorption experiments indicate two forms of heavy metal cations in sulfide minerals: adsorbed (basic) and chemically bound. 相似文献
3.
Novikov G. V. Sedysheva T. Eu. Lobkovsky L. I. Lobus N. V. Bogdanova O. Yu. 《Doklady Earth Sciences》2021,499(2):675-682
Doklady Earth Sciences - The main ore minerals of all layers of cobalt-rich ferromanganese crusts of Guyot Govorov of the Magellanic Mountains of the Pacific Ocean are poorly crystallized, poorly... 相似文献
4.
Oceanology - The article describes the geological conditions of the formation of cobalt-rich ferromanganese crusts on the Govorov guyot in the Magellan Seamount system of the Pacific Ocean. It is... 相似文献
5.
G. V. Novikov O. Yu. Bogdanova M. E. Melnikov A. N. Drozdova N. V. Lobus N. A. Shulga 《Doklady Earth Sciences》2017,477(2):1414-1418
It is shown that the reaction ability of metal cations of ore minerals in Fe–Mn crusts of the Marcus Wake Rise increases in the following manner: (Co2+ < Cu2+ < Ni2+) < (Mg2+ < Mn2+ < K+ ≈ Ca2+ ≈ Na+). The composition of the exchange complex of the ore minerals is constant and includes these metal cations. Ca2+ and Na+ are major contributors to the exchange capacity of the ore minerals. The capacity of the ore minerals by cations of alkali and base metals is 0.43–0.60 and 2.08–2.70 mg-equiv/g, respectively. The exchange capacity of the ore minerals by cations of base metals increases linearly with the increase in the MnO2 content of the crust and does not depend on the geographical locations of the Marcus Wake guyots. 相似文献
6.
Studies were carried out in the Ob River estuary and at the adjacent shelf of the Kara Sea. The concentrations of organic carbon, lipids, major elements (Na, Mg, P, S, K, and Ca), trace elements (Li, Be, B, Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Y, Mo, Ag, Cd, Sb, Cs, Ba, Hg, Tl, Pb, Bi, Th, and U), and rare-earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) were determined in the dominant species of mesozooplankton (Senecella siberica, Limnocalanus macrurus, and Calanus spp.). The similarities and differences are shown for the chemical compositions of the specimens. Calanus spp. are characterized by a large Li accumulation with concentrations ~350 times higher than those in S. siberica and L. macrurus. The total accumulation of chemical elements per unit volume is higher in L. macrurus than in S. siberica and Calanus spp., amounting to 6.63, 0.69, and 0.41 mg, respectively. The intensity of biological accumulation and the spatial disposition of the area of maximum accumulation of elements in the zooplankton community within the boundaries of the Ob River estuary depend on the hydrophysical conditions. Postmortem variations in the concentrations of chemical elements in dead L. macrurus are characterized by a multidirectional nature. The revealed distinctions of the chemical compositions in live and dead L. macrurus represent the features of lifetime and postmortem concentrations of elements. 相似文献
7.
Total mercury concentration in water, seston, soils, and muscle tissues of fish in water bodies in Khan Hoa province was determined.
Hg concentration in water does not exceed 40 ng/l. It migrates in water mostly in dissolved form. Hg concentration in soils
of the examined water bodies varies from 0.01 to 0.05 mg/(kg dry mass) and that in the muscle tissues of fish on the average
does not exceed 1.4 mg/(kg dry mass). 相似文献
8.
N. V. Lobus 《Oceanology》2016,56(6):809-818
The chemical composition of zooplankton in the Kara Sea Basin has been studied. Independent samplings of the open sea and the Blagopoluchie and Tsivol’ki bays of Novaya Zemlya testify to the similarity of the distribution pattern of all the studied elements. The chemical composition of samples is predominated by organic carbon (49.5 ± 4.8% of dry weight). The other most important constituent elements are Na, P, S, K, Mg, and Ca. Their average total concentrations are 4.82 ± 0.1%. From an analysis of the composition of major and trace elements of zooplankton in the Kara Sea and the bays of Novaya Zemlya, three groups of elements have been specified: with similar (Сorg, K, S, P, Al, Ti, Sc, Cd, Se, Cs, and Rb), lower (Na, Ca, Mg, Fe, Mn, Zn, Sr, Ba, B, Cu, Pb, Cr, Ni, V, Co, Sb, Mo, Ag, Be, Ga, and Hg), and higher (Li, As, and U) contents compared to their mean concentrations in ocean zooplankton. 相似文献
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10.
Oceanology - This article presents a data set on ash, proteins, lipids, carbohydrates, chitin, organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) contents, macronutrients ratio (C,... 相似文献