The Nature of Manganese Oxides in Soils and Their Role as Scavengers of Trace Elements: Implication for Soil Remediation

2020 ◽  
pp. 399-429
Author(s):  
Sylvain Grangeon ◽  
Philippe Bataillard ◽  
Samuel Coussy
Keyword(s):  
Trace Elements ◽  
Soil Remediation ◽  
Manganese Oxides

Crystallographic manganese oxides enhanced pyrene contaminated soil remediation in microwave activated persulfate system

2020 ◽  
pp. 127916
Author(s):  
Hongshuai Kan ◽  
Dan Wu ◽  
Tiecheng Wang ◽  
Guangzhou Qu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Soil Remediation ◽  
Contaminated Soil ◽  
Manganese Oxides ◽  
Activated Persulfate

Metals adsorbed to charcoal are not identifiable by sequential extraction

2007 ◽  
Vol 4 (1) ◽  
pp. 26 ◽  
Author(s):  
Yamin Ma ◽  
Andrew W. Rate
Keyword(s):  
Trace Elements ◽  
Metal Ions ◽  
Sequential Extraction ◽  
Trace Element ◽  
Manganese Oxides ◽  
Solid Phase ◽  
Ammonium Oxalate ◽  
Natural Soil ◽  
Trace Metal Ions ◽  
Iron Manganese

Environmental context. Charcoal is widespread in soils and may be a major component of soil organic matter. Trace metal ions in soils are predominantly associated with solid phase materials, including charcoal, and the identity of the solid phase and the mechanisms of association influence the geochemical behaviour of metals. Metals associated with soil mineral phases are estimated using techniques such as selective sequential extraction, and the sorption reactions of metal ions are well understood. Much less is known about the associations of trace metals with natural charcoal, and metals associated with charcoal in soils are likely to be misidentified in sequential extraction procedures. Abstract. Given that up to 50% of the soil carbon store can consist of charcoal, it is possible that trace elements can become immobilised through their interaction with natural charcoal. Hence, natural charcoal may be a significant sink that has yet to be accounted for in trace element biogeochemical cycles. Testing this hypothesis becomes problematic considering the typically small size (<53 µm) of charcoal particles that occur naturally in Australian soils, making isolation and analysis of natural soil charcoal difficult. Therefore, in this study, we test the robustness of a typical sequential extraction technique by applying it to naturally occurring charcoal that had been spiked with five different concentrations of metal ions (Al3+, Cr3+, Cu2+, Ni2+, Zn2+, Cd2+, Ag+, Pb2+). The method was then applied to contrasting soils mixed with this spiked charcoal. The sequential extraction scheme consisted of the following five extractions the in order: (1) sodium acetate (targeting the adsorbed-exchangeable-carbonate fraction), (2) sodium pyrophosphate (organic fraction), (3) ammonium oxalate (amorphous iron/manganese oxides), (4) hydroxylamine hydrochloride (crystalline iron/manganese oxides) and (5) residual (aqua regia digest). The majority of metals added to the charcoal were extracted in the fractions targeting both the amorphous and crystalline iron and manganese oxides, at low additions of metal ions. At higher additions of metals, the metals were mostly extracted from charcoal in the adsorbed-exchangeable-carbonate fraction. When the spiked charcoal was added to soils, a trend similar to the charcoal-only experiment was observed in the sequential extraction data. Higher concentrations of metals (compared with the control) were extracted for the charcoal-amended soils, in the same fractions as in the charcoal-only extractions. Since the concentration of metals extracted in the various extractants changed with increasing metal loads on charcoal, sequential extractions cannot be used to identify the contribution of metals from the charcoal pool. Therefore, a potentially large pool of trace elements could be misrepresented when sequential extraction techniques are applied, particularly for soils in which there is a large concentration of charcoal. Hence, there is still a large gap in knowledge with regard to the significance of charcoal in ‘real’ soils, particularly with respect to the role of charcoal as a trace element sink.

Trace element speciation in water and bottom sediments of the Pirogov water reservoir

2020 ◽  
pp. 59-68
Author(s):  
O. A. Lipatnikova ◽  
T. N. Lubkova ◽  
N. A. Korobova
Keyword(s):  
Trace Elements ◽  
Surface Water ◽  
Bottom Sediments ◽  
Manganese Oxides ◽  
Maximum Permissible Concentration ◽  
Solid Phase ◽  
Metal Speciation ◽  
Water Reservoir ◽  
Element Speciation ◽  
Iron And Manganese

The composition and speciation of trace elements (Cu, Pb, Zn, Cd, Ni, Co, Mn, Fe, Ba, and Sr) in surface water and bottom sediments of the Pirogov water reservoir have been studied. It was found that the metal content in surface water does not exceed the maximum permissible concentration (MPC) for fishery water reservoir excluded Zn (2–9 MPC) and Cu (up to 2 MPC). According to results of thermodynamic calculations, the predominant metal speciation in water is the free ion (Sr, Ba, Zn, Ni, Co, Cd), fulvate (Cu) and carbonate (Pb) complex. The interstitial water is characterized by an increase in the content of sulfate complex of trace elements in loams, the solid phase of which is also characterized by slightly anomalous contents of Zn, Cd, Co, and Ni. According to data of sequential selective procedure, metals are predominantly immobilized in solid phase of bottom sediments in the crystal structure of silicates or bounded to iron and manganese oxides. Only for Cd and Mn exchangeable and bound to carbonates fractions are characterized by considerable relative contents.

scholarly journals Dynamics of Fe, Mn, and Al Liberated from Contaminated Soil by Low-Molecular-Weight Organic Acids and Their Effects on the Release of Soil-Borne Trace Elements

2018 ◽  
Vol 8 (12) ◽  
pp. 2444 ◽  
Author(s):  
Junhao Qin ◽  
Osim Enya ◽  
Chuxia Lin
Keyword(s):  
Molecular Weight ◽  
Trace Elements ◽  
Organic Acids ◽  
Organic Acid ◽  
Contaminated Soil ◽  
Manganese Oxides ◽  
Low Molecular Weight ◽  
Variation Pattern ◽  
Organic Complexes ◽  
Oxalic Acids

A 15-day batch experiment was conducted to investigate the behaviours of Fe, Mn, and Al oxides upon attack by three common low-molecular-weight organic acids, and their effects on liberation of trace elements from a multi-contaminated soil. While the capacity of malic acid to mobilize soil-borne Fe, Mn, and Al was weaker compared to citric and oxalic acids, a similar trend was observed, showing that the concentration of dissolved Fe, Mn, and Al increased with increasing duration of the experiment. Marked increase in metal concentrations only took place after 5 or 7 days of the experiment. For the same organic acid treatment, Fe, Mn, and Al all showed a very similar temporal variation pattern. The concentration of dissolved Fe, Mn, and Al was markedly controlled by the total Fe, Mn, and Al contained in the soil, respectively. It appears that manganese oxides were more reactive to the organic acids, as compared to their Fe and Al counterparts. However, when multiple organic acids were present, the soil-borne Fe, Mn, and Al were mobilized rapidly within the first 5 or 7 days of the experiment and then tended to decrease. The formation of insoluble Fe, Mn, and Al organic complexes tended to be enhanced due to co-existence of multiple organic acids, resulting in the re-immobilization of the dissolved Fe, Mn, and Al. The organic acid-driven dissolution of Fe, Mn, or Al had a major control on the mobilization of As, Cr, Zn, Ni, Cu, and Cd that were bound to these oxides with a correlation coefficient being frequently greater than 0.9 for As, Cr, Zn, and Ni.

Modes of Occurrence of Trace Elements (Na, K, Fe, Si) in Coal Used for COREX Process

2011 ◽  
Vol 391-392 ◽  
pp. 81-85
Author(s):  
Li Hua Zhang ◽  
Jia Xin Fan ◽  
Sheng Li Wu
Keyword(s):  
Trace Elements ◽  
Sequential Extraction ◽  
Iron Oxides ◽  
Manganese Oxides ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure ◽  
Icp Oes ◽  
Digestion Method ◽  
Modes Of Occurrence ◽  
Wet Digestion

In this paper, the modes of occurrence of the trace elements of Na, K, Fe and Si in SX-Coal and SD-Coal, which were used for COREX process, were analyzed. The coal was treated by wet digestion method and then the content of trace elements was analyzed. After that, the modes of occurrence of the elements were studied by sequential extraction procedure method and analyzed by ICP-OES. The results showed that the content of Na element is the highest and the content of K and Si elements is very low among the four elements in both kinds of coal. Na and K elements mainly exist in the mode of residue in SX-Coal and SD-Coal, and they are tends to enriched in the residue during the pyrolysis. Fe and Si elements mainly exist in the mode of carbonate, iron oxides and manganese oxides in SD-Coal. Fe and Si are tends to be decomposed from the compounds during the pyrolysis.

Trace analysis: soils

1990 ◽  
Vol 333 (1628) ◽  
pp. 160-161
Keyword(s):  
Trace Elements ◽  
Manganese Oxides ◽  
Soil Extract ◽  
Water Soluble ◽  
Plant Availability ◽  
Soil Solutions ◽  
Freshwater Biota ◽  
Solute Chemistry ◽  
Trace Concentrations ◽  
Iron And Manganese

Determinations of constituents present in soils and soil solutions at trace concentrations are conducted primarily because of interest in soil as a medium for plant growth or because of its influence upon the solute chemistry of fresh waters and ground waters. Interest may arise from concern over potential toxicity effects or over adverse effects of deficiency of trace nutrient elements essential to soil or freshwater biota. In the above context, total amounts of elements present in soil are generally of less interest than water-soluble or labile, plant available forms (Marr & Cresser 1983). Rhizosphere soil may be more relevant than bulk soil in assessing plant availability. Over recent decades, optimal chemical extractants (such as EDTA or DTPA for Zn and Cu) have been selected which reflect plant availability of trace elements in terms of high correlations between plant tissue and soil extract concentrations. Occasionally full speciation is conducted. M. S. Cresser & E. El-Sayad (unpublished results), for example, have measured water-soluble, exchangeable and organically bound trace elements, and those in carbonate and amorphorus and crystalline iron and manganese oxides, and residual sand, silt and clay minerals. Such detailed analysis is valuable in elucidation of soil pedogenesis (El-Sayad et al . 1988).

Distribution of major and trace elements in marine sediments deposited next to Doce river discharge after the break of the Mariana tailing dam.

2020 ◽  
Author(s):  
Rut Díaz ◽  
Natan Santarém ◽  
Manuel Moreira ◽  
Bruna Dias ◽  
Emmanoel Vieira da Silva Filho ◽  
...  
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Marine Sediments ◽  
Manganese Oxides ◽  
Organic Matter Content ◽  
Major And Trace Elements ◽  
The Other ◽  
Discharge Zone ◽  
The Core ◽  
Tailing Dam

&lt;p&gt;Besides hosting large mining complexes, the Rio Doce basin is widely exploited for agricultural activities and, industrial supplies. The Rio Doce is one of the main water bodies in the southeast region of Brazil, with an estimated sedimentary load of 11.22x10&lt;sup&gt;6&lt;/sup&gt; tons/year and just only it&amp;#8217;s sediment transport capacity, associated with the activities along its watershed, justify a deep study at the continent-ocean interface. However, in addition, in November 2015 the collapse of the Fund&amp;#227;o tailing dam, a property of the Samarco mining company, described as one of the largest environmental disasters in Brazilian history, mobilized around 55 million m&amp;#179; of mining waste through the Rio Doce basin. A reddish, fine granulometry mud, composed of silica, hematite, magnetite, manganese oxides and organic matter was transported in the river system through more than 600 km and released in the ocean. In this sense, the present study evaluated the distribution of major and trace elements in six marine sediments located in the discharge zone of the Rio Doce, three in the continental shelf and three in the slope, after the arrival of the mine tailings. The sediments cores M125-39-2, M125-43-2, M125-44-2, M125-49-2, M125-50-2 and M125-55-8 were collected with a multi-corer during the RV Meteor cruise M125. The major and trace metals were determined through the total digestion method (USEPA 3052) and analyzed by an ICP-OES, also were determined the granulometry, total organic carbon (TOC), total nitrogen (TN), &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C and &amp;#948;&lt;sup&gt;15&lt;/sup&gt;N. The core M125-39-2 closer to the discharge zone of the Rio Doce registered the Mariana event. Two distinct events can be suggested in this core, one associated with the deposition of the mining tailings from the dam rupture and the second by the possible subsequent remobilization of these materials under high rainfall conditions, where an increase in Fe, Al, Si, Ti, As, Pb among other elements was recognized. Interpolation of the &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C and &amp;#948;&lt;sup&gt;15&lt;/sup&gt;N with TOC and TN led to identified two distinct groups in this core, one with a mixed organic matter source (bottom of M125-39-2) and the other with a marine isotopic signature (top of M125-39-2).Also, the granulometric data and the elemental ratios when interpreted together show that the influence of the Rio Doce discharge was predominant to the M125-39-2 core, consistent with an abrupt, localized increase of the terrestrial contribution.&amp;#160; The most superficial centimeter of the core, M125-50-2 presented an increase in the concentrations of Fe, Al, Si, K and, Ti, as in the other trace elements concentrations. The proximity to the source area, the patterns of marine currents and winds in the region were fundamental for the accumulation of major and trace elements from the tailing dam rupture in the core M125-39-2. Finally, organic matter content and the granulometry, despite their secondary role in this study, are factors with some potential that could enhance the adsorption of metals from the ore plume.&lt;/p&gt;

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