Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Pizarro, Carmen; Fabris, José Domingos; Stucki, Joseph W.; Garg, V. K.; Galindo, Géraldine

doi:10.4067/s0717-97072008000300006

Cited by 19 publications

(12 citation statements)

References 13 publications

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“…1). Comparable hyperfine structures to this 80 Kspectrum were earlier reportedly found from fitting 6 K-Mössbauer spectra for ammonium oxalate-treated samples of magnetic silt and clay fractions, of the same Collipulli soil [7,13]. From those spectra, for which all superparamagnetic relaxation effects were virtually blocked, it is plausible, by similarity, to assign the main contributions to the magnetic hyperfine structure of pattern in Fig.…”

Section: Relative Transmissionsupporting

confidence: 78%

“…Ultisols forming on volcanic materials in Chile are characterized by having high iron oxide contents, with significant proportions of magnetic species, in their silt and clay fractions (saturation magnetization for the soil material, σ = 2.40 J T −1 kg −1 ; for silt, σ = 1.26 J T −1 kg −1 , and clay, σ = 1.20 J T −1 kg −1 [7]), making them a potential natural source of iron-based Fenton catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

Manzo¹,

Pizarro²,

Rubio³

et al. 2011

Hyperfine Interact

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A Chilean volcanic Ultisol material was first size-fractionated so as to obtain the fraction with mean particle sizes φ < 53 μm. This sample was then sequentially treated three or five times with 5 mol L −1 NaOH, in an attempt to evaluate the effectiveness of the selective chemical dissolution to concentrate iron oxides, as a preparation procedure before using the materials as heterogeneous Fenton catalysts. The effects of those treatments on the iron oxides mineralogy were monitored with Mössbauer spectroscopy. The NaOH-treated samples were tested as catalysts towards the H 2 O 2 decomposition. Three or five sequential NaOH treatments were found to be comparably effective, by concentrating nearly the same proportion of iron oxides in the remaining solid phase (25.1 ± 0.4 and 23.3 ± 0.2 mass%, V. Manzo et al. respectively). 298 K-Mössbauer patterns were similar for both samples, with a central (super)paramagnetic Fe 3+ doublet and a broad sextet, assignable to several closely coexisting magnetically ordered forms of iron oxides. Despite of this nearly similar effect of the two treatments, the Ultisol material treated three times with NaOH presents higher heterogeneous catalytic efficiency and is more suitable to decompose H 2 O 2 than that with five treatments.

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Section: Relative Transmissionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

Manzo¹,

Pizarro²,

Rubio³

et al. 2011

Hyperfine Interact

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“…LOI, loss on ignition. Zelazny, 1986;Pizarro, Fabris, Stucki & Garg, 2008). The soluble Fe was determined by AAS (6800, Shimadzu, Tokyo, Japan), whereas the soluble Al and Si were determined by ICP-OES (PE 7300 V-ICP, Perkin Elmer).…”

Section: Characterization Of Plant Materials and Soil Samplesmentioning

confidence: 99%

Fern, Dicranopteris linearis, derived phytoliths in soil: Morphotypes, solubility and content in relation to soil properties

Nguyen

Meharg

Carey

et al. 2019

European J Soil Science

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Ferns are among the most popular groups of plants in the tropics and subtropics, and their role as carbon sequestrators has been widely recognized. However, there is little understanding of the silicaceous structures (phytoliths) of ferns, rate of phytolith turnover, the consequences for organic matter sequestered in phytoliths and consequences for other soil properties. In the study reported here, high‐resolution X‐ray tomographic microscopy and chemical characterization were applied to examine the traits of phytoliths of the fern Dicranopteris linearis (Burm.f.) Underw. (D. linearis), with a focus on their dissolution properties and accumulation in northern Vietnamese soils in relation to soil properties. Tomographic images revealed an inter‐embedding structure of silica and organic matter, especially in leaf‐derived material. We propose that organic matter and silica can preserve each other against decomposition. In batch experiments, there was a relatively small rate of dissolution of phytoliths with dry ashing and subsequent H2O2 treatment. Silicon (Si) dissolution for D. linearis phytolith samples was much less than that for rice phytoliths. Despite the fact that the aluminum (Al) content was large in D. linearis leaves, batch dissolution data did not confirm a relation between Al and the slow rate of phytolith dissolution. The soil phytolith content varied from 0.9 to 7.5 g kg−1 in the topsoil across the mountainous areas in northern Vietnam, whereas it tended to be smaller in the subsoil. The data indicate a relation between phytolith and soil organic matter, clay content, oxalate‐soluble Al and electrical conductivity, suggesting that these soil properties are among the important factors affecting the size of the soil phytolith Si pool. Highlights Si tends to accumulate in leaves rather than stems of the fern D. linearis. D. linearis phytoliths showed little dissolution, suggesting their strong stability. OC, EC, clay content and Alox appear as factors ‘feeding’ D. linearis phytoliths. In contrast, Feox and pH did not correlate with D. linearis phytolith content.

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“…Actinomycetes that were able to dissolve phosphate with the highest phosphate solubility index was in isolate 7 with a phosphate source of Ca3(PO4)2 of 278% and the lowest phosphate dissolving index was in isolate 2 of 152% and several Actinomycetes isolates were unable to dissolve the Ca phosphate source, namely isolate 1, 3,4,5,6,8,9,11,12,13,14,15 and17. Not all Actinomycetes are able to dissolve phosphate, Actinomycetes from Micromonospora sp., Nocardia sp., Actinomadura sp., Rhodococcus sp., Actinoplanes sp., Microbispora sp., and Streptosporangium sp.…”

Section: Fig 1maps Of Soil Type and Andisol Soil Samplingmentioning

confidence: 99%

“…Andisols are fertile soils that have suitable physical and chemical characteristics for growing agricultural crops [1]. However, high phosphate retention in Andisols (> 85%) causes most of the P in Andisols not available to be used by plants [2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Isolation, Purification and Potential Test of Actinomycetes in Increasing Phosphate Availability

Alfikri¹,

Sabrina²,

Sahar³

2020

Proceedings of the the 3rd International Conference Community Research and Service Engagements, IC2RSE 2019, 4th December 2019

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High phosphate retention in andisol soils causes low P-Availability in the soil. Nutrient phosphate has a very important role in plant growth. Actinomycetes can be used to dissolve phosphates that are bound to the soil. This research aims to obtain Actinomycetes and tests their effect on increasing the availability of phosphate. This research was carried out in the Soil Biology Laboratory with 2 stages, namely: 1. Isolation and Purification and 2. Test potential of Actinomycetes on Pykovskaya media with several phosphate sources (Ca3(PO4)2; AlPO4 and FePO4). The results obtained showed that there were 17 Actinomycetes isolates isolated from andisol soil at various locations. Some Actinomycetes obtained have the ability to dissolve P-not available into P available on solid pykovskaya media with various phosphate sources (Ca3(PO4)2; AlPO4 and FePO4) but with different abilities.

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Ammonium Oxalate and Citrate-Ascorbate as Selective Chemical Agents for the Mineralogical Analysis of Clay Fractions of an Ultisoland Andisols From Southern Chile

Cited by 19 publications

References 13 publications

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

Preparative treatment with NaOH to selectively concentrate iron oxides of a Chilean volcanic soil material to produce effective heterogeneous Fenton catalyst

Fern, Dicranopteris linearis, derived phytoliths in soil: Morphotypes, solubility and content in relation to soil properties

Isolation, Purification and Potential Test of Actinomycetes in Increasing Phosphate Availability

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