Superfície específica do solo de unidades de mapeamento do estado de São Paulo: II - Influência da matéria orgânica, dos óxidos de ferro livres e dos catíons trocáveis, na superfície específica total do solo

Grohmann, F.

doi:10.1590/s0006-87051972000100014

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…The most of the chemical analyses showed that the studied soils presented characteristics (movement of elements and especially in cations) that are common features of the location soil (i.e., erosion or accumulation position) of tropical and sub-tropical areas (Clemens et al, 2010;Dessalegn et al, 2014). The highest SS in the middle and lower third of the slope is probably related to materials deposited by soil erosion from the higher portions of the relief, such as clay and oxides (Grohmann, 1972). Argissolos (Acrisols) from gneiss change in moist climates show low chemical fertility (Lima et al, 2007).…”

Section: Discussionmentioning

confidence: 91%

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Almeida

Araújo

Filho

et al. 2019

Rev. Bras. Ciênc. Solo

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Sequences of thick and eroded soils in hills surfaces are cultivated with banana since the beginning of the last century in the Northeast of Pernambuco (PE), Brazil. Measurements of soil properties depending on soil slope under intensive agricultural cultivation are limited mostly as the pedogenetic approach. This study aimed to identify the dominant soil types, to evaluate morphological, physical, chemical, and mineralogical properties of soil profiles, and link them to the relief position under continuous banana cropping, in the transition Mata-Agreste of PE. Three slope classes and soil profiles were considered: Profile 1 (P1), upper third of the elevation slope; Profile 2 (P2), middle third of the slope; and Profile 3 (P3) lower third. They were opened, described, and soil samples collected from all horizons at a typical slope of the region. Independent of relief position and land use, all soils are deep (>1.50 m) and present the argic horizons (Bt) developed in all steeply sloping surfaces (15-33 %). The Bt horizon presented the highest values of soil bulk density and microporosity. Despite the presence of illite, all the soil profiles showed remarkable degree weathering, are mostly kaolinitic, besides presenting goethite and quartz in the soil clay fraction, and predominance of quartz in the silt and sand fraction. Water-stable aggregates >2 mm were dominant in all the relief positions. Acidity, low cation exchange capacity, and in general, nutrient poverty were observed in the soil profiles, as opposed accumulation of exchangeable cations on the lower third of the slope (P3). However, the soil properties were affected by land use and water erosion. The Ap horizons showed the highest values of pH, exchangeable bases, phosphorus available, and organic carbon due to agricultural practices, while the steepest slope (P2) had the lowest content of clay, phosphorus and mean weight diameter of aggregates, and higher organic carbon content, in the superficial horizon, due to removal and deposition by water erosion. From the upper third to the lower third of the slope, Nitic Acrisol, Haplic Acrisol, and Nitic Lixisol were formed.

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Section: Discussionmentioning

confidence: 91%

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Almeida

Araújo

Filho

et al. 2019

Rev. Bras. Ciênc. Solo

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“…do solo, devido ao seu alto grau de subdivisão. GROHMANN (1972b) obteve valores de S.E. da matéria orgânica em torno de 870m 2 /g, para solos paulistas.…”

Section: Superfície Específica (Se)unclassified

“…Desse modo, o efeito da possível diminuição da superfície específica em profundidade, devido ao menor teor de matéria orgânica, parece ter sido menos evidente neste solo. GROHMANN (1972b), trabalhando com cinco latossolos semelhantes aos deste trabalho, obteve maiores decréscimos na S.E. de horizontes B quando os óxidos de Fe foram retirados, do que quando a matéria orgânica foi eliminada, corroborando, assim, à discussão até apresentada.…”

Section: Superfície Específica (Se)unclassified

Atributos físicos de latossolos ácricos do norte paulista

Alleoni¹,

Camargo²

1994

Sci. agric. (Piracicaba, Braz.)

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Neste trabalho foram quantificadas a argila dispersa em água (ADA), a água disponível (AD) e a superfície específica (SE) de amostras superficiais e subsuperficiais de três latossolos ácricos paulistas. Estes atributos foram relacionados com a carga elétrica líquida, o ponto de efeito salino nulo e o potencial elétrico superficial. As quantidades de argila dispersa em água diminuíram bastante em profundidade, tendo seus valores variado de 0 a 2% no horizonte B. Nestas camadas, a densidade de carga elétrica, o potencial elétrico superficial e o deltapH estiveram próximos da neutralidade, favorecendo a floculação dos colóides. Os teores de água disponível foram baixos em todas as amostras (<6%), com exceção da camada superficial de um dos latossolos, onde o teor foi médio (6-12%). Os baixos valores refletiram a forte microagregação destes solos, cujo movimento e retenção de água são similares aos de solos arenosos. Os valores de superfície específica de todas as amostras foram baixos (variando de 42 a 104m²/g), resultado da predominância de minerais cauliníticos e oxídicos na fração argila dos solos. Foi observado efeito positivo da matéria orgânica e dos óxidos de ferro nos valores de SE ao longo dos perfis.

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Efficient removal of mercury from aqueous solutions and industrial effluent

Santos

Leal

Oliveira

et al. 2015

Journal of Environmental Science and Health, Part A

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The objective of this study was to examine the ability of a solid waste produced during beneficiation of ornamental rocks to remove mercury (Hg) from an industrial effluent and aqueous solutions under various conditions. Batch studies have been carried out by observing the effects of pH, concentration of the adsorbate, contact time, and so on. Various sorption isotherm models such as Langmuir, Freundlich, and Tóth have been applied for the adsorbent. Film and intraparticle diffusion were both found to be rate-limiting steps. Adsorption was properly described by the Freundlich model (capacity constant of 0.3090 (mg g(-1))(mg L(-1))(-1/n) and adsorption intensity indicator of 2.2939), which indicated a favorable sorption and encouraged subsequent studies for treatment of Hg-containing industrial effluent. Industrial effluent treatment efficiency reached Hg removals greater than 90% by using ornamental rock solid waste (ORSW). Besides, desorption studies indicated that the maximum recovery of mercury was 100 ± 2% for 1 mol L(-1) HNO3 and 74 ± 8% for 0.1 mol L(-1) HNO3. The ORSW could be reused thrice without significant difference on the Hg removal rate from industrial effluent. These findings place ORSW as a promising efficient and low-cost adsorbent for the removal of Hg from aqueous solutions and industrial effluent.

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Superfície específica do solo de unidades de mapeamento do estado de São Paulo: II - Influência da matéria orgânica, dos óxidos de ferro livres e dos catíons trocáveis, na superfície específica total do solo

Cited by 4 publications

References 10 publications

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Atributos físicos de latossolos ácricos do norte paulista

Efficient removal of mercury from aqueous solutions and industrial effluent

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