scholarly journals Understanding the Chemistry of the Actinides in HL Waste Tank Systems: Actinide Speciation in Oxalic Acid Solutions in the Presence of Significant Quantities of Aluminum, Iron, and Manganese

2006 ◽  
Author(s):  
Sue Clark
Keyword(s):  
Oxalic Acid ◽  
Acid Solutions ◽  
Aluminum Iron ◽  
Iron And Manganese

Heterogeneous electron transfer as a pathway in the dissolution of magnetite in oxalic acid solutions

1983 ◽  
Vol 22 (16) ◽  
pp. 2224-2226 ◽  
Author(s):  
E. Baumgartner ◽  
M. A. Blesa ◽  
H. Marinovich ◽  
A. J. G. Maroto
Keyword(s):  
Electron Transfer ◽  
Oxalic Acid ◽  
Acid Solutions ◽  
Heterogeneous Electron Transfer

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.

Oxalic acid and calcium oxalate produced by Leucostoma cincta and L. persoonii in culture and in peach bark tissues

1987 ◽  
Vol 65 (9) ◽  
pp. 1952-1956 ◽  
Author(s):  
J. A. Traquair
Keyword(s):  
Oxalic Acid ◽  
Calcium Oxalate ◽  
Crystal Morphology ◽  
Culture Media ◽  
Positive Staining ◽  
Acid Solutions ◽  
Calcium Oxalate Crystals ◽  
Oxalate Crystals ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes

Oxalic acid and crystals of calcium oxalate were produced during growth of Leucostoma cincta and L. persoonii on potato dextrose agar and in peach bark tissues. The identification of calcium oxalate was based on solubility characteristics, the results of KMnO4 titration, positive staining with silver nitrate – dithiooxamide, and crystal morphology as observed with light and scanning electron microscopes. Oxalic acid was detected by gas chromatography. This is the first report of oxalic acid production by both Leucostoma species causing peach canker. Calcium oxalate crystals observed on or near hyphae in culture were similar to crystals in artificially inoculated peach bark tissues. Addition of oxalic acid solutions alone to inner bark tissues caused maceration and necrosis. These results indicate a role for oxalic acid in the early stages of pathogenesis by Leucostoma spp. Tetragonal (bipyramidal) and prismatic calcium oxalate crystals formed on bark wounds treated with oxalic acid solutions were similar to those observed in infected tissues and in culture media amended with oxalic acid.

Reactivation of severely aged commercial three-way catalysts by washing with weak EDTA and oxalic acid solutions

2007 ◽  
Vol 71 (3-4) ◽  
pp. 185-198 ◽  
Author(s):  
S CHRISTOU ◽  
H BIRGERSSON ◽  
A EFSTATHIOU
Keyword(s):  
Oxalic Acid ◽  
Acid Solutions

Metal oxalates in paints: a Raman investigation on the relative reactivities of different pigments to oxalic acid solutions

2010 ◽  
Vol 397 (2) ◽  
pp. 841-849 ◽  
Author(s):  
A. Zoppi ◽  
C. Lofrumento ◽  
N. F. C. Mendes ◽  
E. M. Castellucci
Keyword(s):  
Oxalic Acid ◽  
Acid Solutions
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