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All publications of “João José Granate de Sá e Melo Marques”

9 results

Arsenate and cadmium content in soils of the cerrado bioma

Mari Lucia Campos, Luiz Roberto Guimarães Guilherme, João José Granate de Sá e Melo Marques, Nilton Curi, Alessandra Siqueira Antunes Araújo, David José Miquelluti, [...]

01/Feb/2013

Knowledge on As and Cd levels in soils is important to monitor the entry of these elements into the food chain from anthropogenic sources. The purpose of this study was to determine the natural content of As and Cd in representative soils of the Cerrado region, Brazil. Soil samples were collected from three sub-regions: G (eastern Goiás), T (Triângulo Mineiro) and N (northeastern MG). To determine the soil levels of As and Cd, samples were digested by acid attack in […]

Soil properties under native vegetation in Minas Gerais, Brazil: distribution by phytophysiognomy, hydrography and spatial variability

Alba Lucia Araujo Skorupa, Luiz Roberto Guimarães Guilherme, Nilton Curi, Charles Plínio de Castro Silva, José Roberto Soares Scolforo, João José Granate de Sá e Melo Marques

01/Feb/2012

One of the factors affecting the distribution of native vegetation is soil formation. Therefore, soils under native vegetation can be highly informative with regard to a region and the original soil fertility, as records of conditions found before agricultural reclamation (agrosilvopasture). The purpose of this study was to assess soil fertility and texture under native vegetation fragments sampled during the Forest Survey of the State of Minas Gerais, Brazil. In general, the variability in all soil properties was high, except […]

Selenium sorption in soils of the cerrado biome

Lívia Botelho de Abreu, Geila Santos Carvalho, Nilton Curi, Luiz Roberto Guimarães Guilherme, João José Granate de Sá e Melo Marques

01/Dec/2011

The study of Se distribution in soils is of general interest because of the narrow range between deficiency and toxicity. The chemical species of Se with the greatest toxicological potential is selenate, due to its high mobility in soils. The study of selenate chemistry is of great importance to understand Se behavior in tropical soils. A batch adsorption experiment was performed using 2 g soil samples in 20 mL of solution with 10 different Se concentrations in the form of […]

Manganese oxides an iron ore province soils, Minas Gerais, Brazil

Amaury de Carvalho Filho, Nilton Curi, João José Granate de Sá e Melo Marques, Edgard Shinzato, Diego Antonio França de Freitas, Elen Alvarenga de Jesus, [...]

01/Jun/2011

The mineralogy of Mn oxides is highly variable and complex, since the number of minerals is large and the knowledge of their structures imprecise. In view of the scarcity of specific papers on Mn oxides in Brazilian soils and their unusually high contents in some soils of one of the Iron Ore Province (IOP) of Minas Gerais State, this study aimed to characterize the chemistry and mineralogy of these oxides in the soils of this region, stratifying them according to […]

Evaluation and spatialization of rainfall erosivity in the Rio Doce Valley, central-eastern region of Minas Gerais, Brazil

Mayesse Aparecida da Silva, Marx Leandro Naves Silva, Nilton Curi, Gérson Rodrigues dos Santos, João José Granate de Sá e Melo Marques, Michele Duarte de Menezes, [...]

01/Aug/2010

A very active and influential parameter in the erosive process is the R factor, called rainfall erosivity. This factor is one of the components of the universal soil loss equation. Studies in spatial variability have been conducted in an attempt to define the spatial distribution of the R factor for a given region. This study aimed to calculate the rainfall erosivity (R factor – EI30) to generate spatial maps. The study was conducted in experimental areas of eucalyptus stands in […]

Use of leather industry residues as nitrogen sources for elephantgrass

Diana Quintão Lima de Oliveira, Kele Tatiane Gomes Carvalho, Ana Rosa Ribeiro Bastos, Luiz Carlos Alves de Oliveira, João José Granate de Sá e Melo Marques, Robervone Severina de Melo Pereira do Nascimento

01/Feb/2008

Large amounts of solid wastes are produced in tanneries, which use chromium (III) to obtain wet blue leather hides. The solid residues (leather scraps and strips) contain around 3 % chromium (III), which represent a serious environmental problem and, presently, have no adequate destination. The leather waste after chromium extraction (collagen) was used as a nitrogen source for elephantgrass- Pennisetum purpureum Schum cv. Napier. Four doses of collagen (4, 8, 16, and 32 t ha-1) and three additional treatments (control; mineral fertilizer N; […]

Content and maximum capacity of arsenic adsorption in Brazilian Oxisols

Mari Lucia Campos, Luiz Roberto Guimarães Guilherme, Rafael Siqueira Lopes, Alessandra Silveira Antunes, João José Granate de Sá e Melo Marques, Nilton Curi

01/Dec/2007

In view of the toxicity of As for man and animals and the possibility of existence of a great number of contaminated areas it is imperative to know the total As content in soils considered uncontaminated and about As sorption processes in soils of variable charge. The objective of this work was to determine the total content and maximum capacity of As adsorption (CMADSAs) in Oxisols. The total content was determined by the USEPA 3051A method. The cmADSAs was determined by […]

Mineralogy and micromorphology of skeletal soils from the cerrado bioma in eastern Goiás

João Bosco Vasconcellos Gomes, Nilton Curi, Darrell Gene Schulze, João José Granate de Sá e Melo Marques, João Carlos Ker, Paulo Emilio Ferreira da Motta

01/Oct/2007

The great amount of mineral material with a diameter > 2 mm in soils of the Cerrado biome is an intriguing characteristic that needs highlights the importance of further studies on soil formation, soil classification, land use and management. For a comparison of the morphological, physical, chemical, mineralogical, and micromorphological attributes of such skeletal soils, profiles of Petric Plinthosols and Haplic Cambisols from the eastern Goiás, Brazil, were studied and compared with similar profiles described in the literature. A pit […]

Individual and competitive sorption of heavy metals in Oxisols with contrasting mineralogy

Maria Aparecida Pereira Pierangeli, Luiz Roberto Guimarães Guilherme, Nilton Curi, Enio Tarso de Souza Costa, José Maria de Lima, João José Granate de Sá e Melo Marques, [...]

01/Aug/2007

The pollution effect of trace elements in the environment depends mainly on the capacity of soil colloids to sorb and maintain them in high energy bonds. This study evaluated the adsorption of Cd, Cu, and Pb in A-horizon samples of Red Latosol and Red-Yellow Latosol (Udox), with similar texture and contrasting mineralogy. For this purpose, isotherms of adsorption, monoelement and multielement were built, based on the soil sample reaction in 5 mmol L-1 Ca(NO3)2 solution adjusted to pH 5.5, with […]