The Experts below are selected from a list of 519906 Experts worldwide ranked by ideXlab platform
Maria Goreti R Vale - One of the best experts on this subject based on the ideXlab platform.
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development of analytical methods for the determination of copper and manganese in infant formula using high resolution continuum source graphite furnace atomic absorption spectrometry and direct solid Sample analysis
Analytical Methods, 2017Co-Authors: Raimundo R Gamela, Alvaro T Duarte, Eliana Galland Barrera, Bernhard Welz, Morgana B Dessuy, Marcia M Silva, Maria Goreti R ValeAbstract:Two fast, simple and reliable methods for the determination of Cu and Mn in infant formula composed of different types of raw materials (rice, oats, bovine milk and soybean) were developed using high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) and direct solid Sample analysis. All measurements were carried out without any chemical modifier and with aqueous standard solutions for calibration. The optimum pyrolysis temperature was 1300 °C for both analytes, and atomization temperatures were 2300 °C and 2100 °C for Cu and Mn, respectively. The characteristic Mass was 8.0 pg for both analytes; the limits of detection and quantification were 0.003 μg g−1 and 0.01 μg g−1, respectively, for Cu, based on a Sample Mass of 3.0 mg, and 0.01 μg g−1 and 0.04 μg g−1, respectively, for Mn, based on a Sample Mass of 1.0 mg. The concentrations obtained ranged from 1.3 to 6.8 μg g−1 for Cu and 0.7 to 17.2 μg g−1 for Mn. The accuracy of the methods was evaluated using the certified reference material NIST SRM 1568a (rice flour) and the results presented no significant difference between the certified and found concentrations. The methods are sensitive, simple and do not require any Sample pretreatment besides milling and homogenization of Samples.
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determination of silicon in plant materials using direct solid Sample analysis with high resolution continuum source graphite furnace atomic absorption spectrometry
Microchemical Journal, 2016Co-Authors: Wiliam Boschetti, Maria Goreti R Vale, Luiza M G Dalagnol, Mariana Dullius, Ariane V Zmozinski, Emilene M Becker, Jailson B De AndradeAbstract:Abstract In this work, a method for the determination of silicon in plant material by high-resolution continuum source graphite furnace atomic absorption spectrometry has been developed using direct solid Sample analysis. The performance of iridium and rhodium as permanent modifiers alone and combined with the palladium–magnesium modifier in solution was investigated. According to the results, among the investigated modifiers, an improvement in sensitivity and Si signal profile was obtained using 300 μg of Rh in combination with 20 μg of Pd + 12 μg of Mg. The optimized pyrolysis and atomization temperatures were 1200 and 2650 °C, respectively. Due to the high content of Si in most of the evaluated Samples, the analytical line of 221.174 nm was chosen. Moreover, an adequate working range (30 to 600 ng Si) was achieved after using a minimum gas flow in the atomization stage and the integrated absorbance of the center pixel only. The Sample Mass varied between 0.03 and 0.50 mg, and no spectral interferences were encountered. The limit of detection was 5 ng mg− 1 and the limit of quantification 17 ng mg− 1, both were calculated according to the maximum Sample Mass of 0.50 mg. The Si content investigated in ten plant Samples varied between 0.5 and 20 μg mg− 1. The accuracy of the method was evaluated using the certified reference materials NCS ZC73014 (Trace elements in Tea) and NCS ZC73349 (Bush Branches and Leaves) and results presented no significant difference between the certified and found concentrations. Therefore, the obtained results prove that an accurate method has been developed and it could be applied to analyze different plant materials with levels varying in a wide range, with minimum of pretreatment.
Jailson B De Andrade - One of the best experts on this subject based on the ideXlab platform.
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determination of silicon in plant materials using direct solid Sample analysis with high resolution continuum source graphite furnace atomic absorption spectrometry
Microchemical Journal, 2016Co-Authors: Wiliam Boschetti, Maria Goreti R Vale, Luiza M G Dalagnol, Mariana Dullius, Ariane V Zmozinski, Emilene M Becker, Jailson B De AndradeAbstract:Abstract In this work, a method for the determination of silicon in plant material by high-resolution continuum source graphite furnace atomic absorption spectrometry has been developed using direct solid Sample analysis. The performance of iridium and rhodium as permanent modifiers alone and combined with the palladium–magnesium modifier in solution was investigated. According to the results, among the investigated modifiers, an improvement in sensitivity and Si signal profile was obtained using 300 μg of Rh in combination with 20 μg of Pd + 12 μg of Mg. The optimized pyrolysis and atomization temperatures were 1200 and 2650 °C, respectively. Due to the high content of Si in most of the evaluated Samples, the analytical line of 221.174 nm was chosen. Moreover, an adequate working range (30 to 600 ng Si) was achieved after using a minimum gas flow in the atomization stage and the integrated absorbance of the center pixel only. The Sample Mass varied between 0.03 and 0.50 mg, and no spectral interferences were encountered. The limit of detection was 5 ng mg− 1 and the limit of quantification 17 ng mg− 1, both were calculated according to the maximum Sample Mass of 0.50 mg. The Si content investigated in ten plant Samples varied between 0.5 and 20 μg mg− 1. The accuracy of the method was evaluated using the certified reference materials NCS ZC73014 (Trace elements in Tea) and NCS ZC73349 (Bush Branches and Leaves) and results presented no significant difference between the certified and found concentrations. Therefore, the obtained results prove that an accurate method has been developed and it could be applied to analyze different plant materials with levels varying in a wide range, with minimum of pretreatment.
Wiliam Boschetti - One of the best experts on this subject based on the ideXlab platform.
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determination of silicon in plant materials using direct solid Sample analysis with high resolution continuum source graphite furnace atomic absorption spectrometry
Microchemical Journal, 2016Co-Authors: Wiliam Boschetti, Maria Goreti R Vale, Luiza M G Dalagnol, Mariana Dullius, Ariane V Zmozinski, Emilene M Becker, Jailson B De AndradeAbstract:Abstract In this work, a method for the determination of silicon in plant material by high-resolution continuum source graphite furnace atomic absorption spectrometry has been developed using direct solid Sample analysis. The performance of iridium and rhodium as permanent modifiers alone and combined with the palladium–magnesium modifier in solution was investigated. According to the results, among the investigated modifiers, an improvement in sensitivity and Si signal profile was obtained using 300 μg of Rh in combination with 20 μg of Pd + 12 μg of Mg. The optimized pyrolysis and atomization temperatures were 1200 and 2650 °C, respectively. Due to the high content of Si in most of the evaluated Samples, the analytical line of 221.174 nm was chosen. Moreover, an adequate working range (30 to 600 ng Si) was achieved after using a minimum gas flow in the atomization stage and the integrated absorbance of the center pixel only. The Sample Mass varied between 0.03 and 0.50 mg, and no spectral interferences were encountered. The limit of detection was 5 ng mg− 1 and the limit of quantification 17 ng mg− 1, both were calculated according to the maximum Sample Mass of 0.50 mg. The Si content investigated in ten plant Samples varied between 0.5 and 20 μg mg− 1. The accuracy of the method was evaluated using the certified reference materials NCS ZC73014 (Trace elements in Tea) and NCS ZC73349 (Bush Branches and Leaves) and results presented no significant difference between the certified and found concentrations. Therefore, the obtained results prove that an accurate method has been developed and it could be applied to analyze different plant materials with levels varying in a wide range, with minimum of pretreatment.
Luiza M G Dalagnol - One of the best experts on this subject based on the ideXlab platform.
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determination of silicon in plant materials using direct solid Sample analysis with high resolution continuum source graphite furnace atomic absorption spectrometry
Microchemical Journal, 2016Co-Authors: Wiliam Boschetti, Maria Goreti R Vale, Luiza M G Dalagnol, Mariana Dullius, Ariane V Zmozinski, Emilene M Becker, Jailson B De AndradeAbstract:Abstract In this work, a method for the determination of silicon in plant material by high-resolution continuum source graphite furnace atomic absorption spectrometry has been developed using direct solid Sample analysis. The performance of iridium and rhodium as permanent modifiers alone and combined with the palladium–magnesium modifier in solution was investigated. According to the results, among the investigated modifiers, an improvement in sensitivity and Si signal profile was obtained using 300 μg of Rh in combination with 20 μg of Pd + 12 μg of Mg. The optimized pyrolysis and atomization temperatures were 1200 and 2650 °C, respectively. Due to the high content of Si in most of the evaluated Samples, the analytical line of 221.174 nm was chosen. Moreover, an adequate working range (30 to 600 ng Si) was achieved after using a minimum gas flow in the atomization stage and the integrated absorbance of the center pixel only. The Sample Mass varied between 0.03 and 0.50 mg, and no spectral interferences were encountered. The limit of detection was 5 ng mg− 1 and the limit of quantification 17 ng mg− 1, both were calculated according to the maximum Sample Mass of 0.50 mg. The Si content investigated in ten plant Samples varied between 0.5 and 20 μg mg− 1. The accuracy of the method was evaluated using the certified reference materials NCS ZC73014 (Trace elements in Tea) and NCS ZC73349 (Bush Branches and Leaves) and results presented no significant difference between the certified and found concentrations. Therefore, the obtained results prove that an accurate method has been developed and it could be applied to analyze different plant materials with levels varying in a wide range, with minimum of pretreatment.
Mariana Dullius - One of the best experts on this subject based on the ideXlab platform.
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determination of silicon in plant materials using direct solid Sample analysis with high resolution continuum source graphite furnace atomic absorption spectrometry
Microchemical Journal, 2016Co-Authors: Wiliam Boschetti, Maria Goreti R Vale, Luiza M G Dalagnol, Mariana Dullius, Ariane V Zmozinski, Emilene M Becker, Jailson B De AndradeAbstract:Abstract In this work, a method for the determination of silicon in plant material by high-resolution continuum source graphite furnace atomic absorption spectrometry has been developed using direct solid Sample analysis. The performance of iridium and rhodium as permanent modifiers alone and combined with the palladium–magnesium modifier in solution was investigated. According to the results, among the investigated modifiers, an improvement in sensitivity and Si signal profile was obtained using 300 μg of Rh in combination with 20 μg of Pd + 12 μg of Mg. The optimized pyrolysis and atomization temperatures were 1200 and 2650 °C, respectively. Due to the high content of Si in most of the evaluated Samples, the analytical line of 221.174 nm was chosen. Moreover, an adequate working range (30 to 600 ng Si) was achieved after using a minimum gas flow in the atomization stage and the integrated absorbance of the center pixel only. The Sample Mass varied between 0.03 and 0.50 mg, and no spectral interferences were encountered. The limit of detection was 5 ng mg− 1 and the limit of quantification 17 ng mg− 1, both were calculated according to the maximum Sample Mass of 0.50 mg. The Si content investigated in ten plant Samples varied between 0.5 and 20 μg mg− 1. The accuracy of the method was evaluated using the certified reference materials NCS ZC73014 (Trace elements in Tea) and NCS ZC73349 (Bush Branches and Leaves) and results presented no significant difference between the certified and found concentrations. Therefore, the obtained results prove that an accurate method has been developed and it could be applied to analyze different plant materials with levels varying in a wide range, with minimum of pretreatment.
