Heavy metal-bearing Mn oxides in river channel and floodplain sediments

2000 ◽  
Author(s):  
K. A. Hudson-Edwards
Keyword(s):  
Heavy Metal ◽  
River Channel ◽  
Floodplain Sediments ◽  
Mn Oxides

Mobility of Zinc in Heavy Metal Contaminated Soil after Compost Amendment and Brassica juncea Harvest

2014 ◽  
Vol 641-642 ◽  
pp. 1141-1145 ◽  
Author(s):  
Hong Li Huang ◽  
Lin Luo ◽  
Jia Chao Zhang ◽  
Pu Feng Qin ◽  
Man Yu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Brassica Juncea ◽  
Contaminated Soil ◽  
Water Soluble ◽  
Residual Fraction ◽  
Mobility Factor ◽  
Zn Concentration ◽  
Compost Amendment ◽  
Exchangeable Fraction ◽  
Mn Oxides

Pot experiments were performed to investigate the effect of compost amendment on the mobility of zinc through analysis of Zn fractions in heavy metal contaminated soil. The results showed that the total Zn concentration decreased 8.11%, 10.15%, 16.15%, 20.05%, 7.28% and 5.02% after the amendment of 0, 20, 40, 60, 80, 100 g/kg compost to soil and Brassica juncea harvest, respectively. Zn was mostly concentrated in the residual fraction and Fe-Mn oxides fraction in soil. The percentage of Zn in water-soluble fraction, organic fraction and residual fraction had no correlation with the amount of compost amendment. The percentage of Zn in the exchangeable fraction decreased and the percentage of Zn in Fe-Mn oxides fractions increased obviously. Furthermore, the mobility factor of Zn decreased significantly from 19.20% without compost amendment to 19.09%, 18.70%, 18.15%, 16.45% and 16.12% after the amendment of 0, 20, 40, 60, 80, 100 g/kg compost to soil, the compost amendment could lowered the mobility and phytotoxicity of zinc through bound to Fe-Mn oxides.

Heavy Metal Pollution of River Sludge in Taiyuan

2011 ◽  
Vol 243-249 ◽  
pp. 5280-5284
Author(s):  
Hui Jie Tan ◽  
Chi Zhang ◽  
Zeng Zhang Wang ◽  
Ping Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Chemical Speciation ◽  
Pollution Characteristics ◽  
Metal Fraction ◽  
Metal Fractions ◽  
Mn Oxides

Samples of the sludge were collected from urban channels in Taiyuan city, and its pollution characteristics of heavy metals were researched. As the emphasis, the distribution regularity of five chemical speciation about Cd, Cr, Zn, Cu, Ni, Pb were analyzed. The results showed that the concentration of Ni, Zn, Cr over standard in various degrees. The residual metal fractions had a higher proportion for all heavy metals. Cd, Zn and Ni were predominantly associated with the carbonates bonded metal fraction and the organics-sulfide bonded metal fraction. Cu, Pb and Cr were predominantly bound to the organics/sulfide and Fe/Mn oxides, but their proportion are different. The bio-transportation index of Zn and Ni are larger than the others. This is the emphasis of heavy metal pollutions control for the local channels.

scholarly journals Vliv sedimentačního prostředí na magnetickou susceptibilitu přelivových sedimentů nivy Moravy ve Strážnickém Pomoraví

2020 ◽  
Vol 27 (1-2) ◽  
Author(s):  
Jaroslava Ježková ◽  
Zdeněk Máčka
Keyword(s):  
Magnetic Particles ◽  
Organic Matter Content ◽  
Matter Content ◽  
River Channel ◽  
Oxbow Lake ◽  
Magnetic Signal ◽  
Sedimentary Environments ◽  
Direct Dependence ◽  
19Th And 20Th Century ◽  
Floodplain Sediments

Four profiles in different sedimentary environments - natural levee, proximal floodplain, distal floodplain, oxbow lake - were sampled to obtain magnetic susceptibility (MS), grain size, organic matter content (LOI) and pH. Relationships between selected parameters (χlf, D50, LOI, pH) were analysed by means of statistical analysis (linear regression, PCA, factor analysis). Principal goal was to investigate how character of individual sedimentary environments and their distance from the active river channel is reflected in the magnetic signal of overbank deposits. A decrease in the magnetic signal with increasing distance from the river channel was shown, confirming that fluvial deposition is a major factor of contamination of floodplain sediments by anthropogenic magnetic particles. The base of elevated values of MS (levee: 80 cm, proximal floodplain: 30 cm) probably corresponds to the turn of the 19th and 20th century and the strongest magnetic signal (levee: 32,5 cm, proximal floodplain: 5 cm) belongs to the 1980s. Statistically significant relationships were found between: χlf and LOI (direct dependence), LOI and D50 (indirect dependence), pH and D50 (direct dependence) when data from all profiles were analysed together.

Magnetically modified fungal Mn oxides with high sequestration efficiency for simultaneously removing multiple heavy metal ions from wastewater

2014 ◽  
Vol 2 (3) ◽  
pp. 1635-1641 ◽  
Author(s):  
Duangrat Inthorn ◽  
Yukinori Tani ◽  
Jianing Chang ◽  
Hirotaka Naitou ◽  
Naoyuki Miyata
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Mn Oxides

scholarly journals Spatial Variability of Heavy Metals in Soils and Sediments of “La Zacatecana” Lagoon, Mexico

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Sergio A. Covarrubias ◽  
Juan Armando Flores de la Torre ◽  
María Maldonado Vega ◽  
Francisco Javier Avelar González ◽  
Juan José Peña Cabriales
Keyword(s):  
Heavy Metal ◽  
Mine Tailings ◽  
Metal Content ◽  
Agricultural Soils ◽  
Anthropogenic Activities ◽  
Affected Area ◽  
The North ◽  
Soils And Sediments ◽  
Mn Oxides ◽  
Heavy Metals In Soils

Anthropogenic activities have greatly increased heavy metal pollution worldwide. Due to inadequate waste management, mining is one of the chief causes. One particularly affected area in Mexico is the “La Zacatecana” Lagoon, in the municipality of Guadalupe, Zacatecas. From colonial times until the mid-nineteenth century, about 20 million tons of mine tailings were deposited at this site. Here, we catalogue the heavy metal content and their distribution in soils and sediments of La Zacatecana. The mobility of lead in soils was also assayed by sequential extraction. Concentrations of the different metals analysed were as follows: Pb > Cr > As > Ni > Hg > Cd. Site VIII accumulated the highest amount of Pb (3070 mg·kg−1) sevenfold more than the limit established by the Mexican standards for agricultural soils (i.e., 400 mg·kg−1). On the other hand, the contents of Cd, Cr, and Ni were within the levels accepted by the above normativity, set at 37, 280, and 1600 mg·kg−1, respectively. Concentrations of Hg and Pb were highest in the north-northwest zone of the lagoon and decreased towards the southeast. Except for Site VIII where 30% of the Pb was in an interchangeable form or bound to carbonates, most Pb in La Zacatecana soils was present in an unavailable form, associated with Fe-Mn oxides.

Dynamic of lead speciation in sewage sludge composting

2004 ◽  
Vol 50 (9) ◽  
pp. 75-82 ◽  
Author(s):  
G.D. Zheng ◽  
T.B. Chen ◽  
D. Gao ◽  
W. Luo
Keyword(s):  
Heavy Metal ◽  
Organic Matter ◽  
Sewage Sludge ◽  
Extraction Method ◽  
Large Scale ◽  
Chemical Speciation ◽  
Lead Speciation ◽  
Sequential Extraction Method ◽  
Mn Oxides ◽  
Sludge Composting

A large-scale sewage sludge composting experiment was conducted to develop an understanding of changes that occur to Pb chemical speciation, distribution and bio-availability during the course of composting. The four-stage Tessier sequential extraction method was employed to investigate the dynamics of heavy metal Pb speciation (exchangeable, bound to carbonates, bound to Fe-Mn oxides, bound to organic matter and sulphides, residual) during the course of sewage sludge composting. The concentrations of the total Pb and the five Pb fractions concentrations were increased during the whole stage of compost. However, the percentages of Pb distribution with respect to total Pb were changed in the following manner: exchangeable, bound to Fe-Mn oxides and bound to carbonates Pb with respect to total Pb were increased, while the percentages of bound to organic matter and sulphides, and residual Pb with respect to total Pb were decreased during composting. The data showed that the quantity of Pb in the less toxic portion, such as consisting of organic matter and sulphides bound and residual Pb, was increased, and that the contamination and bio-availability of heavy metal Pb in sewage sludge was reduced during the composting process.

A manganese-oxidizing bacterial consortium and its biogenic Mn oxides for dye decolorization and heavy metal adsorption

Chemosphere ◽  
2020 ◽  
Vol 253 ◽  
pp. 126627 ◽  
Author(s):  
Wenjie Wan ◽  
Yonghui Xing ◽  
Xiuxiu Qin ◽  
Xiang Li ◽  
Song Liu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Dye Decolorization ◽  
Bacterial Consortium ◽  
Metal Adsorption ◽  
Heavy Metal Adsorption ◽  
Biogenic Mn Oxides ◽  
Mn Oxides

scholarly journals Removal of multi-heavy metals using biogenic manganese oxides generated by a deep-sea sedimentary bacterium – Brachybacterium sp. strain Mn32

Microbiology ◽  
2009 ◽  
Vol 155 (6) ◽  
pp. 1989-1996 ◽  
Author(s):  
Wenming Wang ◽  
Zongze Shao ◽  
Yanjun Liu ◽  
Gejiao Wang
Keyword(s):  
Heavy Metal ◽  
Deep Sea ◽  
Manganese Oxides ◽  
High Capacity ◽  
Basic Knowledge ◽  
X Ray Diffraction ◽  
Potential Applications ◽  
Biogenic Mn Oxides ◽  
Mn Oxides ◽  
Oxidation Mechanisms

A deep-sea manganese-oxidizing bacterium, Brachybacterium sp. strain Mn32, showed high Mn(II) resistance (MIC 55 mM) and Mn(II)-oxidizing/removing abilities. Strain Mn32 removed Mn(II) by two pathways: (1) oxidizing soluble Mn(II) to insoluble biogenic Mn oxides – birnessite (δ-MnO2 group) and manganite (γ-MnOOH); (2) the biogenic Mn oxides further adsorb more Mn(II) from the culture. The generated biogenic Mn oxides surround the cell surfaces of strain Mn32 and provide a high capacity to adsorb Zn(II) and Ni(II). Mn(II) oxidation by strain Mn32 was inhibited by both sodium azide and o-phenanthroline, suggesting the involvement of a metalloenzyme which was induced by Mn(II). X-ray diffraction analysis showed that the crystal structures of the biogenic Mn oxides were different from those of commercial pyrolusite (β-MnO2 group) and fresh chemically synthesized vernadite (δ-MnO2 group). The biogenic Mn oxides generated by strain Mn32 showed two to three times higher Zn(II) and Ni(II) adsorption abilities than commercial and fresh synthetic MnO2. The crystal structure and the biogenic MnO2 types may be important factors for the high heavy metal adsorption ability of strain Mn32. This study provides potential applications of a new marine Mn(II)-oxidizing bacterium in heavy metal bioremediation and increases our basic knowledge of microbial manganese oxidation mechanisms.

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