Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region

Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region

To evaluate phosphate adsorption in Rio Grande do Norte semiarid soils, laboratory determinations were made utilizing samples collected at up to 20 cm of depth, from a Vertisol (V) and two Fluvents (Ae1 and Ae2). In these soils remaining phosphorus was determined after agitation of the samples with a solution of CaCl2 10 mmol/L containing 60 mg/L of P, for one hour. The phosphorus doses for Langmuir isotherm adjustment were defined based on the remaining P values and corresponded to 0.0; 6.0; 12.0; 18.0; 30.0; 42.0; 54.0; 66.0; 84.0; 102.0; and 120.0 mg/L. The data of adsorbed P and the concentrations of equilibrium solutions obtained after 24-hour agitation of soil samples with the solutions of CaCl2 10 mmol/L containing the above-cited P concentrations, were adjusted to Langmuir isotherm. Three different adsorption regions were identified and adjusted to linear regression models. The maximum phosphate adsorption capacity (CMAF) and the constant related to the adsorption energy of phosphates (EAF) were determined. The CMAF presented values of 0.312; 0.291 and 0.249 mg of P/cm3 of soil for soils V, Ae1 and Ae2, respectively. Phosphate adsorption was strongly influenced by the specific surface and P content of the soils. In soils V and Ae1, the remaining phosphorus decreased with and increase in the clay content, while CMAF and EAF increased with an increase in clay.

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Main Authors: Godinho, Vicente de Paulo Campos, Sampaio, Regynaldo Arruda, Venegas, Victor Hugo Alvarez, Ruiz, Hugo Alberto
Format: Digital revista
Language:por
Published: Pesquisa Agropecuaria Brasileira 1997
Online Access:https://seer.sct.embrapa.br/index.php/pab/article/view/4727
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spelling rev-pab-br-article-47272015-03-10T17:53:50Z Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region Adsorção de fosfatos em três solos da região semi-árida do Rio Grande do Norte Godinho, Vicente de Paulo Campos Sampaio, Regynaldo Arruda Venegas, Victor Hugo Alvarez Ruiz, Hugo Alberto phosphorus; equilibrium phosphorus; adsorption maximum capacity; adsorption energy fósforo; fósforo remanescente; capacidade máxima de adsorção; energia de adsorção To evaluate phosphate adsorption in Rio Grande do Norte semiarid soils, laboratory determinations were made utilizing samples collected at up to 20 cm of depth, from a Vertisol (V) and two Fluvents (Ae1 and Ae2). In these soils remaining phosphorus was determined after agitation of the samples with a solution of CaCl2 10 mmol/L containing 60 mg/L of P, for one hour. The phosphorus doses for Langmuir isotherm adjustment were defined based on the remaining P values and corresponded to 0.0; 6.0; 12.0; 18.0; 30.0; 42.0; 54.0; 66.0; 84.0; 102.0; and 120.0 mg/L. The data of adsorbed P and the concentrations of equilibrium solutions obtained after 24-hour agitation of soil samples with the solutions of CaCl2 10 mmol/L containing the above-cited P concentrations, were adjusted to Langmuir isotherm. Three different adsorption regions were identified and adjusted to linear regression models. The maximum phosphate adsorption capacity (CMAF) and the constant related to the adsorption energy of phosphates (EAF) were determined. The CMAF presented values of 0.312; 0.291 and 0.249 mg of P/cm3 of soil for soils V, Ae1 and Ae2, respectively. Phosphate adsorption was strongly influenced by the specific surface and P content of the soils. In soils V and Ae1, the remaining phosphorus decreased with and increase in the clay content, while CMAF and EAF increased with an increase in clay. Com o objetivo de avaliar a adsorção de fosfatos em solos da região semi-árida do Rio Grande do Norte, foram realizadas determinações de laboratório utilizando-se amostras, coletadas até 20 cm de profundidade, de um Vertissolo (V) e de dois solos Aluviais eutróficos (Ae1 e Ae2). Nesses solos, o P remanescente foi determinado após agitação das amostras com uma solução de CaCl2 10 mmol/L, contendo 60 mg/L de P, durante uma hora. As doses de fósforo para o ajuste da isoterma-de-Langmuir foram definidas com base nos valores de P remanescente e corresponderam a 0,0; 6,0; 12,0; 18,0; 30,0; 42,0; 54,0; 66,0; 84,0; 102,0 e 120,0 mg/L de P. Os dados de P adsorvido e as concentrações das soluções de equilíbrio, obtidos após a agitação por 24 horas das amostras de solo com as soluções de CaCl2 10 mmol/L contendo as concentrações de P supracitadas, foram ajustados à isoterma-de-Langmuir. Três diferentes regiões de adsorção foram identificadas e ajustadas a modelos de regressão linear. Foram determinadas a capacidade máxima de adsorção de fosfatos (CMAF) e a constante relacionada com a energia de adsorção de fosfatos (EAF). A CMAP apresentou valores de 0,312; 0,291 e 0,249 mg de P/cm3 de solo, para os solos V, Ae1 e Ae2, respectivamente. A adsorção de fosfatos foi fortemente influenciada pela superfície específica e pelo teor de P dos solos. Nos solos V e Ae1, o P remanescente diminuiu com o aumento do teor de argila, enquanto a CMAF e EAF aumentaram com o incremento de argila. Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira 1997-08-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.sct.embrapa.br/index.php/pab/article/view/4727 Pesquisa Agropecuaria Brasileira; v.32, n.8, ago. 1997; 819-823 Pesquisa Agropecuária Brasileira; v.32, n.8, ago. 1997; 819-823 1678-3921 0100-104x por https://seer.sct.embrapa.br/index.php/pab/article/view/4727/7316
institution EMBRAPA
collection OJS
country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-pab-br
tag revista
region America del Sur
libraryname Sistema de bibliotecas de EMBRAPA
language por
format Digital
author Godinho, Vicente de Paulo Campos
Sampaio, Regynaldo Arruda
Venegas, Victor Hugo Alvarez
Ruiz, Hugo Alberto
spellingShingle Godinho, Vicente de Paulo Campos
Sampaio, Regynaldo Arruda
Venegas, Victor Hugo Alvarez
Ruiz, Hugo Alberto
Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
author_facet Godinho, Vicente de Paulo Campos
Sampaio, Regynaldo Arruda
Venegas, Victor Hugo Alvarez
Ruiz, Hugo Alberto
author_sort Godinho, Vicente de Paulo Campos
title Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
title_short Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
title_full Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
title_fullStr Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
title_full_unstemmed Phosphate adsorption in three soils of the Rio Grande do Norte semiarid region
title_sort phosphate adsorption in three soils of the rio grande do norte semiarid region
description To evaluate phosphate adsorption in Rio Grande do Norte semiarid soils, laboratory determinations were made utilizing samples collected at up to 20 cm of depth, from a Vertisol (V) and two Fluvents (Ae1 and Ae2). In these soils remaining phosphorus was determined after agitation of the samples with a solution of CaCl2 10 mmol/L containing 60 mg/L of P, for one hour. The phosphorus doses for Langmuir isotherm adjustment were defined based on the remaining P values and corresponded to 0.0; 6.0; 12.0; 18.0; 30.0; 42.0; 54.0; 66.0; 84.0; 102.0; and 120.0 mg/L. The data of adsorbed P and the concentrations of equilibrium solutions obtained after 24-hour agitation of soil samples with the solutions of CaCl2 10 mmol/L containing the above-cited P concentrations, were adjusted to Langmuir isotherm. Three different adsorption regions were identified and adjusted to linear regression models. The maximum phosphate adsorption capacity (CMAF) and the constant related to the adsorption energy of phosphates (EAF) were determined. The CMAF presented values of 0.312; 0.291 and 0.249 mg of P/cm3 of soil for soils V, Ae1 and Ae2, respectively. Phosphate adsorption was strongly influenced by the specific surface and P content of the soils. In soils V and Ae1, the remaining phosphorus decreased with and increase in the clay content, while CMAF and EAF increased with an increase in clay.
publisher Pesquisa Agropecuaria Brasileira
publishDate 1997
url https://seer.sct.embrapa.br/index.php/pab/article/view/4727
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AT ruizhugoalberto phosphateadsorptioninthreesoilsoftheriograndedonortesemiaridregion
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AT venegasvictorhugoalvarez adsorcaodefosfatosemtressolosdaregiaosemiaridadoriograndedonorte
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