Cation-exchange properties of sediments in the Central depression of the Barents Sea

2021 ◽  
pp. 472-492
Author(s):  
G.V. Novikov ◽  
◽  
G.I. Sychkova ◽  
Keyword(s):  
Cation Exchange ◽  
Barents Sea ◽  
Metal Salt ◽  
Exchange Capacity ◽  
Heavy Metal Cations ◽  
The Barents Sea ◽  
Central Depression ◽  
Equilibrium Exchange ◽  
The One ◽  
Exchange Properties

The article presents data on the study of cation exchange properties of sediments in the Central depression of the Barents Sea relative to heavy metals. The experiments were carried out both on sediments of natural moisture and on sediments after removal of sludge water. The maximum values of the equilibrium exchange capacity of sediments containing and not containing silt water practically coincide and are (in mg-eqv/g) in Mn, Ni, Zn, Cd – 0.20-0.28; Pb – 0.28-0.40; Cu – 0.36-0.66. According to the obtained values of the exchange capacity of precipitation belong to the class of adsorbents. The influence of sediments size and concentration of metal salt solutions on the exchange capacity of precipitation was studied. It is concluded that, on the one hand, precipitation contributes to the circulation of heavy metal cations in the marine environment, on the other hand, sediments can be considered as cleaners and pollutants of marine waters.

scholarly journals Sorption of heavy metal cations on sediments of the central depression of the Barents Sea

2019 ◽  
Vol 489 (4) ◽  
pp. 399-404
Author(s):  
G. V. Novikov ◽  
A. P. Lisitsyn ◽  
G. I. Sychkova
Keyword(s):  
Heavy Metal ◽  
Barents Sea ◽  
Metal Cations ◽  
Exchange Capacity ◽  
Absorption Capacity ◽  
Metal Salts ◽  
Heavy Metal Cations ◽  
The Barents Sea ◽  
Central Depression ◽  
Equilibrium Exchange

The article presents data on the study of the sorption of heavy metal cations on the sediments of the Central depression of the Barents Sea. Experiments were carried out on sediments of natural humidity and after removal of silt water from them, on separate classes of size of sediments. The maximum values of the equilibrium exchange capacity of sediments containing and not containing silt water practically coincide with each other. Сapacity increases in the range (Mn Ni Zn Cd) (Pb Cu) and ranges from 0,30 Mn to 0,71 Cu mg-eqv/g. According to the obtained values of the sediment capacity belong to the class of adsorbents. The influence of size, mineral composition of sediments and concentration of solutions of metal salts on the absorption capacity of sediments was studied. It is concluded that sediments can be considered as cleaners and pollutants of marine waters.

Sorption of Heavy Metal Cations in Sediments of the Central Depression of the Barents Sea

2019 ◽  
Vol 489 (2) ◽  
pp. 1426-1431
Author(s):  
G. V. Novikov ◽  
A. P. Lisitsyn ◽  
G. I. Sychkova
Keyword(s):  
Heavy Metal ◽  
Barents Sea ◽  
Metal Cations ◽  
Heavy Metal Cations ◽  
The Barents Sea ◽  
Central Depression

Effects of high pH solutions with large monovalent cation concentrations on cation exchange properties

Soil Research ◽  
1996 ◽  
Vol 34 (2) ◽  
pp. 229 ◽  
Author(s):  
RE Liefering ◽  
CDA Mclay
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Negative Charge ◽  
Monovalent Cation ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Ion Concentration ◽  
Exchangeable Sodium ◽  
High Ph ◽  
Exchange Properties

Disposal of strongly alkaline industrial liquid wastes, which contain large monovalent cation concentrations, by means of land treatment systems is becoming increasingly common. This study investigated the effects of solutions with large monovalent cation concentrations and high pH on cation exchange properties in four New Zealand soils with different clay mineralogies. The soils were shaken with a range of concentrations (0–0.3 M) of NaOH, KOH, NaCl, and KCl. Cation exchange capacity (CEC) and exchangeable cations (Ca2+, Mg2+, K+, and Na+) were measured following shaking and washing procedures. Although the hydroxide solutions dissolved significant amounts of organic matter from all soils, there was still a net increase in CEC measured at all hydroxide concentrations. The magnitude of the CEC increase was dependent on hydroxide concentration. The increase in CEC is attributed to newly generated negative charge on surfaces which possess variable charge (i.e. pH dependent) characteristics such as edge sites of clay minerals, sesquioxides, and the undissolved organic matter remaining in the soil. In contrast to hydroxide solutions, no increase in CEC was measured in chloride-treated samples. Increases in the concentration of all treatment solutions resulted in increases in the exchangeable ion concentration of the index cation used in the treatment solution (either Na+ or K+) and decreases in concentration of the other three exchangeable cations. In general, higher exchangeable sodium percentage (ESP) values were measured in samples treated with NaOH than samples treated with NaCl at all concentrations. Similarly, higher exchangeable potassium percentage (EPP) was measured in samples treated with KOH than samples treated with KCl at all concentrations. The higher ESP and EPP values recorded when hydroxide solutions were used as treatments are attributed to the newly generated negative charges being counter-balanced by the monovalent index cation present in the treatment solution. It is suggested that existing equations commonly used to predict ESP and EPP values are unsuccessful for accurately predicting changes when soils are treated with hydroxide solutions, due to their inability to account for the newly generated exchange sites. The equations did, however, adequately predict the effects of both chloride solutions on ESP and EPP.

A proposed new reagent for the measurement of cation exchange properties of carbonate soils

Soil Research ◽  
1985 ◽  
Vol 23 (4) ◽  
pp. 633 ◽  
Author(s):  
BM Tucker
Keyword(s):  
Calcium Carbonate ◽  
Cation Exchange ◽  
Charge Exchange ◽  
Double Layer ◽  
Aqueous Ethanol ◽  
Choline Chloride ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Layer Charge ◽  
Exchange Properties

A solution of choline chloride (1 mol L-1) in aqueous ethanol (65% by weight) is proposed as a reagent for extracting double-layer exchangeable cations from soils containing calcium carbonate, instead of the previously used solution of NH4Cl (1 mol L-1) at pH 8.5 in aqueous ethanol. This choline chloride reagent gives better estimates of double-layer exchangeable cations and of double-layer charge (exchange capacity) because it dissolves less CaCO3, and reacts less with specifically adsorbed forms of Ca, Mg and K than the NH4Cl reagent does. Because plants can use both adsorbed and exchangeable cations, the new reagent is not suitable for measuring nutrient cation availabilities. Cation exchange values for a range of Australian carbonate soils are presented to show the differences to be expected between analyses by the choline chloride and the NH4Cl reagents.

Novel Synthetic Clays for Cation Exchange

2006 ◽  
Vol 45 ◽  
pp. 209-217
Author(s):  
Tatsuya Kodama ◽  
Nobuyuki Gokon ◽  
Sridhar Komarneni
Keyword(s):  
Cation Exchange ◽  
Cost Effective ◽  
Exchange Capacity ◽  
Synthetic Mica ◽  
Naturally Occurring ◽  
High Layer ◽  
Exchange Kinetics ◽  
Brittle Mica ◽  
Very High ◽  
Exchange Properties

This paper reviews synthesis, characterization and cation exchange properties of a novel swelleing mica "Na-4-mica" and their synthetic analogues with a high layer charge denisty. Na-4-mica (Na4Mg6Al4Si4O20F4) of a synthetic brittle mica has a very high Al(III) content and but exhibits unusual swelling behavior and selective cation exchange properties potentially useful in hazardous cation separations from solutions. Although normal brittle micas do not swell in water at all, this synthetic mica can readily become hydrated upon contact with water or even in moist air. This mica has a theoretical cation-exchange capacity of 468 milli-equivalents per 100 g on an anhydrous basis. The present authors found a simple and cost-effective preparation process of micro- or nano-crystallites of this mica from naturally occurring clay kaolinite. The fine mica is a selective exchanger for Sr, Ba, Ra, Pb, Cu, or Zn. The modified micas, such as "Na-3-mica" and "Na-2-mica" were also synthesized by the similar syntehtic processes. Na-3-mica improved the cation exchange kinetics and capacity for Sr. These micas also exhibited extremely low cation leachability once dehydrated at room temperature or moderate temperatures, and, hence, are expected to be useful for radioactive strontium or radium removal followed by its immobilization for safe disposal.

Dynamics of benthic communities in the Central Depression of the Barents Sea

2010 ◽  
Vol 37 (5) ◽  
pp. 523-531 ◽  
Author(s):  
O. S. Lyubina ◽  
D. R. Dikaeva ◽  
E. A. Frolova ◽  
A. A. Frolov ◽  
O. L. Zimina ◽  
...  
Keyword(s):  
Barents Sea ◽  
Benthic Communities ◽  
The Barents Sea ◽  
Central Depression

Powder x-ray diffraction study of a cryptomelane-type manganic acid and its alkali cation exchanged forms

1993 ◽  
Vol 8 (12) ◽  
pp. 3145-3150 ◽  
Author(s):  
Masamichi Tsuji ◽  
Sridhar Komarneni
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Lattice Parameter ◽  
Exchange Capacity ◽  
Alkali Cation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Steep Decrease ◽  
Exchange Properties ◽  
Good Agreement

Cryptomelane-type manganic acid (CMA), H2Mn8O16 · 2.4H2O, with a theoretical cation exchange capacity of 2.70 meq/g, was prepared and its cation exchange properties were studied as a function of XM which is defined by the ratio of uptake in meq/g to the theoretical capacity. Plots of the corrected selectivity coefficients log KHM vs the fractional exchange M for alkali metal ions on a 2 × 2 type tunnel-structured manganic acid showed a gradual decrease in small XMM regions and a steep decrease in large XMM) were 0.92 for Li+, 0.74 for Na+ and K+, 0.67 for Rb+, and 0.44 for Cs+. These maximums have been attributed to steric limitation as well as a limit on the expansion of the crystal lattice. Some x-ray diffraction (XRD) data of alkali cation exchanged forms were in good agreement with the XRD data of synthetic alkali CMA phases as given in the cards by the Joint Committee on Powder Diffraction Standards (JCPDS). The lattice parameter a0 has been found to depend on the exchanged amounts and the nature of the cations involved, while the c0 value remained almost the same irrespective of the amount of exchange or the nature of the cations.

Hydrous oxides and their cation-exchange properties

1965 ◽  
Vol 15 (10) ◽  
pp. 445-448 ◽  
Author(s):  
C. Heitner-Wirguin ◽  
A. Albu-Yaron
Keyword(s):  
Cation Exchange ◽  
Hydrous Oxides ◽  
Exchange Properties

Method application of optimal multi-parameter analysis to assess the distribution of water masses as an example of CTD data of the Barents Sea in summer 2017

2019 ◽  
pp. 38-51
Author(s):  
Valeriy G. Yakubenko ◽  
Anna L. Chultsova
Keyword(s):  
Barents Sea ◽  
Field Measurements ◽  
Structural Similarity ◽  
Water Masses ◽  
Parameter Analysis ◽  
Water Dynamics ◽  
Phosphorus Concentration ◽  
Nitrogen And Phosphorus ◽  
The Barents Sea ◽  
Expert Assessments

Identification of water masses in areas with complex water dynamics is a complex task, which is usually solved by the method of expert assessments. In this paper, it is proposed to use a formal procedure based on the application of the method of optimal multiparametric analysis (OMP analysis). The data of field measurements obtained in the 68th cruise of the R/V “Academician Mstislav Keldysh” in the summer of 2017 in the Barents Sea on the distribution of temperature, salinity, oxygen, silicates, nitrogen, and phosphorus concentration are used as a data for research. A comparison of the results with data on the distribution of water masses in literature based on expert assessments (Oziel et al., 2017), allows us to conclude about their close structural similarity. Some differences are related to spatial and temporal shifts of measurements. This indicates the feasibility of using the OMP analysis technique in oceanological studies to obtain quantitative data on the spatial distribution of different water masses.

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