scholarly journals Direct determination of Cd in NaCl containing metallothionein fractions of different red mullet tissues by GF-AAS

2005 ◽  
Vol 20 (10) ◽  
pp. 1121 ◽  
Author(s):  
Zrinka Dragun ◽  
Biserka Raspor
Keyword(s):  
Direct Determination ◽  
Red Mullet ◽  
Gf Aas

Direct determination of tin in whole blood and urine by GF AAS

2013 ◽  
Vol 46 (1-2) ◽  
pp. 123-127 ◽  
Author(s):  
S.V. De Azevedo ◽  
F.R. Moreira ◽  
R.C. Campos
Keyword(s):  
Whole Blood ◽  
Direct Determination ◽  
Gf Aas

Direct Determination of Mn in Breast Milk by GF AAS After Multivariate Optimization

2009 ◽  
Vol 42 (7) ◽  
pp. 923-934 ◽  
Author(s):  
Paulo Celso Pereira Lara ◽  
Josianne Nicácio Silveira ◽  
Waldomiro Borges Neto ◽  
José Bento Borba da Silva
Keyword(s):  
Breast Milk ◽  
Direct Determination ◽  
Multivariate Optimization ◽  
Gf Aas

scholarly journals Evaluation of Copper and Manganese Concentrations in Commercial Fruit Juices and Nectars Consumed in Brazil by GF AAS

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Pamela S. M. Rocha ◽  
Graziela F. B. Cruz ◽  
Ricardo J. Cassella
Keyword(s):  
Graphite Furnace ◽  
Direct Determination ◽  
Grape Juice ◽  
Absorption Spectrometry ◽  
Fruit Juices ◽  
Simple Method ◽  
Hno3 Solution ◽  
Two Samples ◽  
Gf Aas

The present work proposes a simple method for direct determination of Cu and Mn in commercial fruit juices and nectars by graphite furnace atomic absorption spectrometry (GF AAS). We analyzed samples of different flavors (orange, mango, passion fruit, peach, and grape) and brands of Brazilian commercial fruit juices and nectars. We also carried out a study to define a suitable temperature program and to optimize the calibration conditions. It was possible to determine Cu and Mn in the samples just after a simple dilution of samples with a 0.70 mol L−1 HNO3 solution, except in the case of grape juice. We compared the results obtained with the proposed method to those obtained after a traditional treatment based on acid digestion in a microwave oven, and no significant differences were observed (except for grape juice). The accuracy of the method was assessed through a recovery test, which provided recovery percentages in the range of 81–117%. Precision was always better than 8%, and the limits of quantification for Cu and Mn were 6 μg L−1 and 9 μg L−1, respectively. We analyzed twenty-two samples, and the concentrations of Cu and Mn were in the range of 24.1–321 μg L−1 and 116–3296 μg L−1, respectively. Statistical analysis using a two-way analysis of variance (ANOVA) at 95% confidence level showed that flavor and brand impacted on the concentration of the analytes in the samples. Among the samples analyzed, the grape juice presented the highest concentrations of both Cu and Mn.

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination

A New Method for Direct Determination of the Recoilless Fraction with Application to Magnetic Nanoparticles

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu
Keyword(s):  
Room Temperature ◽  
Average Particle Size ◽  
Direct Determination ◽  
Average Particle ◽  
Lattice Method ◽  
Recoilless Fraction ◽  
Single Room ◽  
Magnetite Particles ◽  
Physical Mixtures

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.

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