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| Milagres,João José de Miranda; Alvarez V.,Víctor Hugo; Cantarutti,Reinaldo Bertola; Neves,Júlio César Lima. |
| Para aumentar a precisão nas análises químicas de fertilidade do solo e dosar simultaneamente vários elementos, alguns laboratórios vêm optando pelo uso da técnica da espectrofotometria de emissão ótica em plasma induzido (ICP), em detrimento da técnica da espectrofotometria de absorção atômica (EAA), hoje comumente utilizada nos laboratórios de análise de solos. Este trabalho, além de comparar as duas técnicas de dosagem quanto à precisão, à reprodutibilidade e à magnitude dos teores dos micronutrientes Fe, Zn, Cu e Mn, extraídos por Mehlich-1, Mehlich-3 e DTPA-TEA, objetivou, também, selecionar os comprimentos de onda que apresentam menores interferências espectrais no ICP. Foram utilizadas 36 amostras (0 a 0,2 m) de solos coletadas nos Estados de Minas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Análise química do solo; ICP; Comparação de métodos; Precisão; Reprodutibilidade. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832007000200006 |
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| Wang,QL; Liu,DH; Yue,JY. |
| This study aimed to determine the effects of different Cd concentrations (0, 1, 10, 100, and 300 µM CdCl2) on Allium plantlets. To achieve this goal, we examined the (1) dynamics of Cd2+ fux in the rhizosphere, (2) partitioning of Cd between roots and leaves, (3) formation of reactive oxygen species (ROS), (4) levels of H2O2 and chlorophyll, and (5) translocation of several macro- and micronutrients. A strong net Cd2+ influx was observed in the root apex after exposure to 100 µM Cd for 24 h. Exposure to either 1 or 10 µM Cd for 96 h presented no evident influence on root growth. However, treatments with 100 to 300 µM Cd for 72 h significantly inhibited root growth. ROS levels increased in roots and leaves with increasing Cd concentrations. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cadmium (Cd) toxicity; Net cadmium flux; ICP; Oxidative stress; Photosynthesis. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200015 |
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| Bortolon,Leandro; Gianello,Clesio. |
| The amounts of macro (P, K, Ca and Mg) and micronutrients (Cu and Zn) extracted with the Mehlich-1 (M1) solution, by the 1.0 mol L-1 KCl (KCl) and with the 0.1 mol L-1 HCl (HCl) for representative soil types of the Rio Grande do Sul state (Brazil) were compared with those extracted with the Mehlich-1 solution determined with the inductively coupled plasma optical emission spectroscopy (ICP). The amounts of nutrients extracted by the different methods showed high correlation coefficients. On average, the Mehlich-1 solution extracted similar amounts of P, determined with colorimetric and ICP methods, and, K determined with emission and ICP. The amounts of Ca and Mg extracted with the Mehlich-1 solution, determined by ICP, were similar to those extracted with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil testing; ICP; Mehlich-1. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000100013 |
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