Comparison of H/Al stoichiometry of mineral and organic soils in Brazil

Pérez, Daniel Vidal; Anjos, Lúcia Helena Cunha dos; Ebeling, Adierson Gilvani; Pereira, Marcos Gervásio

doi:10.1590/s0100-06832009000400031

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…Estudando Histosols da Flórida, Zelazny & Carlisle (1974) constataram variações de pH em KCl entre 0,4 e 0,7 unidades menores que o pH em água. Os valores de pH em água estão dentro da faixa reportada por Perez et al (2009): 3,0 a 5,9. Já Volk & Schnitzer (1973), em estudo sobre subsidência em Histosols na Flórida, encontraram valores de pH em água de 5,4 a 7,9.…”

Section: Atributos Químicosunclassified

Atributos químicos, carbono orgânico e substâncias húmicas em Organossolos háplicos de várias regiões do Brasil

Ebeling

Anjos

Pérez

et al. 2011

Rev. Bras. Ciênc. Solo

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RESUMOA dinâmica e os atributos da matéria orgânica do solo (MOS) há muito vêm sendo estudados em solos minerais. Entretanto, em condições tropicais, poucos estudos envolvem os solos orgânicos e a caracterização das substâncias húmicas (SH), ou sua relação com atributos químicos relevantes, para avaliar o potencial agrícola. Os objetivos deste estudo foram: avaliar atributos químicos de Organossolos Háplicos de diferentes regiões do Brasil; quantificar o teor de C orgânico no solo e nas frações da MOS; e avaliar as relações entre esses atributos em cada ambiente de formação. Foram avaliados os atributos químicos e quantificados os teores de C orgânico total e das frações da MOS (ácido fúlvico -C-FAF, ácido húmico -C-FAH e humina -C-HUM), bem como as relações C-FAH/C-FAF, C-EA/C-HUM, em que C-EA (carbono do extrato alcalino) é obtido pelo somatório de C-FAF e C-FAH. Os Organossolos apresentaram elevada acidez, saturação por bases abaixo de 50 % e elevada capacidade de troca catiônica potencial (T), embora com valores altos de Ca 2+ e Mg 2+ e de soma de bases, na maioria dos perfis. Os teores de C nas frações húmicas apresentaram correlação significativa com diferentes atributos dos solos, como entre os valores de C-FAH e de C-HUM e os teores de N, H + e T. O C-HUM e o C-FAH predominaram sobre o C-FAF. A relação C-FAH/C-FAF foi menor nos horizontes mais superficiais, dos perfis com maior intensidade de uso ou efeito de queimadas, assim como os teores de

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Section: Atributos Químicosunclassified

Atributos químicos, carbono orgânico e substâncias húmicas em Organossolos háplicos de várias regiões do Brasil

Ebeling

Anjos

Pérez

et al. 2011

Rev. Bras. Ciênc. Solo

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“…According to Pérez et al (2009), the procedure of extraction with KCl and titration with NaOH determines H + , identified as exchangeable acidity (Sposito, 1989). Therefore, in this context, there is no differentiation between "exchangeable H + " and the H + produced by the hydrolysis of Al.…”

Section: Aluminium Contents Determined By Different Methodsmentioning

confidence: 99%

“…When determining Al contents in 18 horizons of mineral soils with kaolinite and/or iron/aluminium oxyhydroxides as the main clay fraction minerals, Pérez et al (2009) concluded that most protons quantified in the extracts of the mineral soils, i.e., the exchangeable acidity, originated from the hydrolysis of exchangeable Al.…”

Section: Aluminium Contents Determined By Different Methodsmentioning

confidence: 99%

Quantification of aluminium in soil of the Solimões Formation, Acre State, Brazil

Bernini

Pereira

Anjos

et al. 2013

Rev. Bras. Ciênc. Solo

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The variety of soils in the State of Acre is wide and their chemical profiles are still not fully understood. The nature of the material of origin of these soils is indicated by the high aluminium (Al) content, commonly associated with high calcium (Ca) and magnesium (Mg) contents. The study objective was to use different methods to quantify Al in soils from toposequences formed from material of a sedimentary nature originating from the Solimões Formation, in Acre, Brazil. Trenches were opened at three distinct points in the landscape: shoulder, backslope and footslope positions. Soil samples were collected for physical, chemical, mineralogical analyses. The Al content was quantified using different methods. High Al contents were found in most of these horizons, associated with high Ca and Mg levels, representing the predominant cations in the sum of exchangeable bases. The mineralogy indicates that the soils are still in a low weathering phase, with the presence of significant quantities of 2:1 minerals. Similar Al contents were determined by the methods of NaOH titration, xylenol orange spectrometry and inductively coupled plasma optical emission spectrometry. However, no consistent data were obtained by the pyrocatechol violet method. Extraction with KCl overestimated the exchangeable Al content due to its ability to extract the non-exchangeable Al present in the smectite interlayers. It was observed that high Al contents are related to the instability of the hydroxyl-Al smectite interlayers.

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“…From the values of volume of NaOH standard solutions consumed in titrations, the Acidity Index (mol L -1 ) for each of the studied samples was calculated according to Equation 1. The same experiment was carried out for the volumes collected in the test mix negative control (absence of microorganism) (Perez, Anjos, Ebeling, & Pereira, 2009).…”

Section: Titration and Molar Concentration Calculationsmentioning

confidence: 99%

Evaluation of the biodegradation of phthalic contaminants originated from polyvinyl chloride commercial films

Luzia¹,

Sarrouh²,

Lofrano³

2020

Acta Sci Technol

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The excessive use of phthalates (PHEs) plasticizers has promoted a serious environmental problem. This study evaluated the biodegradation of PHEs from polyvinyl chloride (PVC) film, aiming to mitigate damage to the environment. Therefore, 23 microorganisms were prospected and isolated from the Serra do Ouro Branco State Park (Minas Gerais, Brazil), where screening was carried out by growth in enriched microbial medium and esterase-activity was monitored by diffusion in solid agar. Three microorganisms were selected. Bacterium (I) presented the highest esterase activity, as evidenced in the diffusion tests in solid medium. Further, evidence of this is given by the biodegradation of PHEs into phthalic acid, because changes the acid concentration from 0 to 3.10 ± 0.07 mol L-1 and 28 % mass reduction of PVC film after 24 days. Furthermore, after six days of biodegradation the number of viable cells and ammonia concentration showed no significant change. This indicates that the survival of the Bacterium (I) cells is independent of ammonia consumption, but rather depends on PHEs consumption. The detection of the organic functions of -COOH and –COOR proved the biodegradation of PHEs by Bacterium (I), thus demonstrating its potential to be used in bioremediation of soils and rivers from PHEs contaminants.

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Comparison of H/Al stoichiometry of mineral and organic soils in Brazil

Cited by 9 publications

References 16 publications

Atributos químicos, carbono orgânico e substâncias húmicas em Organossolos háplicos de várias regiões do Brasil

Atributos químicos, carbono orgânico e substâncias húmicas em Organossolos háplicos de várias regiões do Brasil

Quantification of aluminium in soil of the Solimões Formation, Acre State, Brazil

Evaluation of the biodegradation of phthalic contaminants originated from polyvinyl chloride commercial films

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