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| Tzaskos,Danilla Fernanda; Marcovicz,Crislaine; Dias,Nivea Maria Piccolomini; Rosso,Neiva Deliberali. |
| Glyphosate is a systemic, post-emergent, non-selective herbicide widely used in agriculture. The objective of this study was to develop a method for sample preparation, to partially purified natural water samples contaminated with residues of glyphosate, and to quantify them by derivation and spectroscopically. To assess the accuracy of the method, samples of water from an artesian well and from a stream were fortified with known amounts of glyphosate. The concentration of glyphosate was determined using a standard curve concentration range from 4 to 14 mg L-1. From the concentration of glyphosate recovered, in both samples of fortified water it was found that DOWEX MWA-1 resin and NaCl 0.100 mol L-1 eluent were effective in the purification of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Residues; Spectroscopic studies; Systemic herbicide. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400003 |
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| Dias,Nivea Maria Piccolomini; Alleoni,Luís Reynaldo Ferracciú; Casagrande,José Carlos; Camargo,Otávio Antônio. |
| O cádmio é um metal pesado que pode ser adicionado ao solo por meio do lixo urbano ou industrial, lodo de esgoto e fertilizantes fosfatados. É facilmente absorvido e translocado pelas plantas, tendo potencial de entrar na cadeia alimentar humana. A persistência e a mobilidade do cádmio no solo é determinada pela intensidade da adsorção pelos colóides do solo. A avaliação da energia livre de adsorção de um elemento ao solo pode servir como medida da força da reação. Estudou-se a energia livre da reação de adsorção de cádmio em amostras superficiais (0-0,2m) e subsuperficiais (na maior expressão do horizonte B) de um Nitossolo Vermelho eutroférrico, um Latossolo Vermelho acriférrico e um Latossolo Amarelo ácrico, após a adição de 5, 10, 15, 25, 50, 75, 100,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Material orgânica; Óxido de ferro; Ponto de efeito salino nulo. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000500006 |
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| Dias,Nivea Maria Piccolomini; Caires,Eduardo Fávero; Pires,Luiz Fernando; Bacchi,Márcio Arruda; Fernandes,Elisabete Aparecida de Nadai. |
| The objective of this work was to determine the impact of phosphogypsum application on 226Ra and 228Ra activities in the soil and on their accumulation in soybean grains. A field experiment was carried out in Paraná state, Brazil, on a loamy Typic Hapludox, under no-till system, with increasing phosphogypsum rates: 4, 8, and 12 Mg ha-1. GammA ray spectrometry was carried out using HPGe detectors with 45 and 10% relative efficiencies, for soybean grains and soil, respectively. No increment of 226Ra and 228Ra activities was observed due to the increase in phosphogypsum rates in the soil, and a small reduction was noticed in the grains. Average values found for 226Ra and 228Ra activities were 37 and 57 Bq kg-1 in the soil and 1.44 and 3.19 Bq kg-1 in soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Gamma spectrometry; Radioactivity; 226Ra; 228Ra. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001200017 |
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