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All publications of “Clístenes Williams Araújo do Nascimento”

23 results

Assessing the Content of Micronutrients in Soils and Sugarcane in Different Pedogeological Contexts of Northeastern Brazil

Rita de Cássia Ferreira da Silva ORCID logo , Fernando Bruno Vieira da Silva ORCID logo , Caroline Miranda Biondi ORCID logo , Clístenes Williams Araújo do Nascimento ORCID logo , Emídio Cantídio Almeida de Oliveira ORCID logo

25/Jul/2019

ABSTRACT Micronutrient research for sugarcane in northeastern Brazil is scarce and most works on this issue date back to the 70’s and 80’s. The objectives of this study were to assess the available and reserve pools of Fe, Mn, Cu, and Zn in soils cultivated with sugarcane under three geological contexts in northeastern Brazil as well as to diagnose the micronutrient nutritional status of sugarcane grown on these areas in order to identify pedogeological conditions in which micronutrient deficiencies are […]

Visual Abstract

Geochemistry and Spatial Variability of Rare Earth Elements in Soils under Different Geological and Climate Patterns of the Brazilian Northeast

Cinthia Maria Cordeiro Atanázio Cruz Silva, Ronny Sobreira Barbosa, Clístenes Williams Araújo do Nascimento, Yuri Jacques Agra Bezerra da Silva, Ygor Jacques Agra Bezerra da Silva

18/Jun/2018

ABSTRACT Growth in the agricultural and industrial sectors has increased the demand for rare earth elements (REEs) in the production of technological devices and fertilizers. Thus, the accumulation of these elements in the soil has become an environmental concern. Here, we aim to determine the natural contents of REEs in soils derived from different parent materials and under climatic conditions ranging from humid to semi-arid. We then evaluate the influence of major elements and soil properties on the geochemistry of […]

Rare Earth Element Concentrations in Brazilian Benchmark Soils

Ygor Jacques Agra Bezerra da Silva, Clístenes Williams Araújo do Nascimento, Yuri Jacques Agra Bezerra da Silva, Caroline Miranda Biondi, Cinthia Maria Cordeiro Atanázio Cruz Silva

08/Dec/2016

ABSTRACT: Studies regarding background concentrations of rare earth elements (REEs) are scarce and have mainly focused on a limited number of soil types from the northern hemisphere. The aim of this study was to determine REE concentrations in thirty-five benchmark soils of Brazil. Composite soil samples were taken from areas under native vegetation or with minimal anthropogenic influence. Concentrations of La, Ce, Pr, Nd, Sm, Eu, Gd, Yb, Lu, Dy, Er, Ho, Tb, Tm, Y, Sc, and Fe were determined […]

Phytoextractor Potential of Cultivated Species in Industrial Area Contaminated by Lead

Silvânia Maria de Souza Gomes Nascimento, Adailson Pereira de Souza, Vera Lúcia Antunes de Lima, Clístenes Williams Araújo do Nascimento, Joab Josemar Vitor Ribeiro do Nascimento

08/Dec/2016

ABSTRACT: High growth rate is one of the criteria used for the selection of species to be used in metal phytoextraction programs. This study was carried out to characterize the growth characteristics of sunflower (Helianthus annuus L.), castor bean (Ricinus communis L.), corn (Zea mays L), and vetiver [Vetiveria zizanioides (L.) Nash] grown on a soil contaminated with lead (Pb), with and without pH correction, to improve agronomic practices regarding phytoremediation programs. The experiment was designed as a randomized block […]

Background and Reference Values of Metals in Soils from Paraíba State, Brazil

Agenor Bezerra de Almeida, Clístenes Williams Araújo do Nascimento, Caroline Miranda Biondi, Adailson Pereira de Souza, Felipe Martins do Rêgo Barros

13/Apr/2016

ABSTRACT Soil contamination by heavy metals threatens ecosystems and human health. Environmental monitoring bodies need reference values for these contaminants to assess the impacts of anthropogenic activities on soil contamination. Quality reference values (QRVs) reflect the natural concentrations of heavy metals in soils without anthropic interference and must be regionally established. The aim of this study was to determine the natural concentrations and quality reference values for the metals Ag, Ba, Cd, Co, Cu, Cr, Mo, Ni, Pb, Sb and […]

Potencial Acidity Estimated by the SMP Buffer Solution Method in Soils of Paraiba, Brazil

Agenor Bezerra de Almeida, Clístenes Williams Araújo do Nascimento, Felipe Martins do Rêgo Barros

01/May/2015

Due to its analytical practicality, the SMP buffer solution method has been widely used in Brazilian soil laboratories in estimation of soil potential acidity (H+Al) instead of the extracted by 0.5 mol L-1 calcium acetate solution. However, regionalized studies are indispensable for reliably estimating values of potential acidity. The aim of this study was to fit a regression equation with good predictive capacity of the H+Al values based on measurement of the pH(SMP) for soils of the State of Paraiba, […]

Tolerance of castor bean to zinc assessed by chlorophyll fluorescence and plant nutrition

Marise Conceição Marques, Clístenes Williams Araújo do Nascimento

01/Jun/2014

Measurement of chlorophyll fluorescence can be a useful tool for detecting changes in the photosynthetic apparatus of plants. With the understanding that early detection of zinc (Zn) contamination is fundamental in environmental monitoring, the aim of this study was to assess Zn stress in castor bean (Ricinus communis) plants using X-ray chlorophyll fluorescence. The changes brought about by Zn in photosynthetic pigments and in the mineral composition of plants were also studied. Castor bean plants were grown for 28 days […]

Quality reference values for heavy metals in soils of Rio Grande do Norte, Brazil

Welka Preston, Clistenes Williams Araújo do Nascimento, Caroline Miranda Biondi, Valdomiro Severino de Souza Junior, William Ramos da Silva, Hailson Alves Ferreira

01/Jun/2014

Industrial development and population growth have increased heavy metal concentrations in soils and impacted soil quality. In this scenario, environmental protection agencies have been concerned with establishing heavy metal quality reference values (QRV) that may identify contaminated sites. The study was carried out to provide soil reference values for the metals Ag, Ba, Cd, Co, Cr, Cu, Ni, Pb, Sb, V, and Zn in soils of the State of Rio Grande do Norte according to Brazilian legislation. The study analyzed […]

Comparison of digestion methods to determine heavy metals in fertilizers

Ygor Jacques Agra Bezerra da Silva, Clístenes Williams Araújo do Nascimento, Caroline Miranda Biondi, Welka Preston

01/Apr/2014

The lack of a standard method to regulate heavy metal determination in Brazilian fertilizers and the subsequent use of several digestion methods have produced variations in the results, hampering interpretation. Thus, the aim of this study was to compare the effectiveness of three digestion methods for determination of metals such as Cd, Ni, Pb, and Cr in fertilizers. Samples of 45 fertilizers marketed in northeastern Brazil were used. A fertilizer sample with heavy metal contents certified by the US National […]

Humic acids and activated charcoal as soil amendments to reduce toxicity in soil contaminated by lead

Nielson Machado dos Santos, Adriana Maria de Aguiar Accioly, Clístenes Williams Araújo do Nascimento, Jorge Antonio Gonzaga Santos, Ivo Ribeiro Silva

01/Feb/2014

Soil contamination by Pb poses a significant risk to human health. The municipality of Santo Amaro da Purificação, Bahia, Brazil, has one of the most severe cases of contamination of this metal in the world. The objective of this study was to evaluate the effect of humic acids and activated charcoal as soil amendments for reducing the toxicity of Pb to corn plants grown in contaminated soil collected near the area of the company responsible for the contamination. Application rates […]

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