A Comparison of Strontium Sorption to Hydrous Aluminum, Iron, and Manganese Oxides

1999 ◽  
Vol 218 (2) ◽  
pp. 554-563 ◽  
Author(s):  
Paras Trivedi ◽  
Lisa Axe
Keyword(s):  
Manganese Oxides ◽  
Aluminum Iron ◽  
Strontium Sorption ◽  
Iron And Manganese

Ultrasound-Assisted Citric Acid Extraction of Zinc in Plateau Red Soil and Tessier Speciation Study

2013 ◽  
Vol 726-731 ◽  
pp. 4464-4467
Author(s):  
Wei Wei ◽  
Xue Jin Zhou ◽  
Yun Tao Gao
Keyword(s):  
Heavy Metal ◽  
Citric Acid ◽  
Manganese Oxides ◽  
Red Soil ◽  
Extraction Rate ◽  
Acid Extraction ◽  
Speciation Study ◽  
Ultrasonic Assisted ◽  
Ultrasound Assisted ◽  
Iron And Manganese

Taking plateau red soil as research object, using the ultrasonic-assisted organic acid extraction the heavy metal zinc in it, and analyze the form of zinc. Results showed that the extraction rate can reach 68%, with the increase of time, the extraction effect of zinc is obviously enhanced in this method. Ultrasonic-assisted citric acid extraction soil can increase the extraction rate of exchangeable, bound to carbonates and bound to iron and manganese oxides relatively.

Recovery of Degraded Areas in Vale do Paraíba, São Paulo, Brazil: Performance Indicators

2010 ◽  
Vol 107 ◽  
pp. 27-34 ◽  
Author(s):  
Maria Regina de Aquino-Silva ◽  
Marcos Roberto Simão ◽  
Denise da Silva Santos ◽  
Eduardo Jorge de Brito Bastos
Keyword(s):  
Performance Indicators ◽  
Vegetation Structure ◽  
Bank Erosion ◽  
Sand Mining ◽  
Chemical Factor ◽  
Vegetation Development ◽  
Aluminum Iron ◽  
Negative Factors ◽  
Soil Indicators ◽  
Iron And Manganese

The aim of restoration is recompose a new vegetation structure in order to obtain benefits such as the containment of bank erosion, reestablishment of a hydric and nutrient regime, and increase the diversity of species. The present paper evaluated the development of the vegetation introduced as ciliar forest around a mining lagoon through establishing indicators based on the vegetation structure, physic-chemical characteristics of the soil and the water. Results show that the indicators of vegetation, like dying of species and the covering of top were classified as negative factors. Regarding vegetation development, it was considered positive when individuals out of inundation points were analyzed. According to soil indicators, chemical factor pH acid suggests intoxication by aluminum, iron and manganese impeding development of the vegetation in the local. Topographic factor also caused erosion and dying/extinction of species localized in declining points and carried nutrients to the inundation point and finally to the sand mining pool.

Strategies for EELS Data Analysis. Introducing UMAP and HDBSCAN for Dimensionality Reduction and Clustering

2021 ◽  
pp. 1-14
Author(s):  
Javier Blanco-Portals ◽  
Francesca Peiró ◽  
Sònia Estradé
Keyword(s):  
Dimensionality Reduction ◽  
Clustering Analysis ◽  
Manganese Oxides ◽  
Spatial Clustering ◽  
State Of The Art ◽  
Core Loss ◽  
Nonnegative Matrix ◽  
Case Scenario ◽  
Electron Energy Loss ◽  
Iron And Manganese

Hierarchical density-based spatial clustering of applications with noise (HDBSCAN) and uniform manifold approximation and projection (UMAP), two new state-of-the-art algorithms for clustering analysis, and dimensionality reduction, respectively, are proposed for the segmentation of core-loss electron energy loss spectroscopy (EELS) spectrum images. The performances of UMAP and HDBSCAN are systematically compared to the other clustering analysis approaches used in EELS in the literature using a known synthetic dataset. Better results are found for these new approaches. Furthermore, UMAP and HDBSCAN are showcased in a real experimental dataset from a core–shell nanoparticle of iron and manganese oxides, as well as the triple combination nonnegative matrix factorization–UMAP–HDBSCAN. The results obtained indicate how the complementary use of different combinations may be beneficial in a real-case scenario to attain a complete picture, as different algorithms highlight different aspects of the dataset studied.

Enhancing Cd(II) Adsorption on Rice Straw Biochar by Modification of Iron and Manganese Oxides

2021 ◽  
Author(s):  
Wen-Tao TAN ◽  
Hang ZHOU ◽  
Shang-Feng TANG ◽  
Peng ZENG ◽  
Jiao-Feng GU ◽  
...  
Keyword(s):  
Rice Straw ◽  
Manganese Oxides ◽  
Rice Straw Biochar ◽  
Iron And Manganese

Enhanced adsorption of tetracycline by an iron and manganese oxides loaded biochar: Kinetics, mechanism and column adsorption

2021 ◽  
Vol 320 ◽  
pp. 124264
Author(s):  
Xin Zhang ◽  
Yaru Li ◽  
Mengru Wu ◽  
Yao Pang ◽  
Zhenbing Hao ◽  
...  
Keyword(s):  
Manganese Oxides ◽  
Column Adsorption ◽  
Enhanced Adsorption ◽  
Iron And Manganese

Manganese Spherulites at an Intra-Cretaceous Disconformity, Banks Island, Northwest Territories

1974 ◽  
Vol 11 (12) ◽  
pp. 1704-1716 ◽  
Author(s):  
Andrew D. Miall
Keyword(s):  
Quartz Sand ◽  
Manganese Oxides ◽  
Molecular Diffusion ◽  
Diffusion Processes ◽  
Volcanic Rocks ◽  
Manganese Concentration ◽  
Crystal Texture ◽  
Banks Island ◽  
The Matrix ◽  
Iron And Manganese

Concretions ranging from 10 to 700 μ in diameter form a marker zone between the Christopher Formation (Albian) and the Kanguk Formation (Cenomanian to Maastrichtian) in three wells in western Banks Island. The concretions contain in excess of 30% rhodochrosite (MnCO3), plus minor quantities of dolomite, and iron and manganese oxides. Quartz sand and silt, clay, and sparry dolomite comprise the matrix between the concretions. The concretion zone ranges up to 40 ft (12 m) in thickness and is tentatively assigned to the Kanguk Formation.Manganese was probably derived by decomposition of contemporaneous volcanic rocks, possibly located offshore west of Banks Island. The metal was concentrated by ionic or molecular diffusion processes acting immediately below the sediment–water interface.Subsequent diagenetic recrystallization allowed for further manganese concentration and the development of a strong radial-fibrous crystal texture as the surrounding sediments were passively replaced. Concentric laminations were caused by further partial expulsion of impurities, probably including organics and iron and manganese oxides.

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