Aplicação de métodos quimiométricos na otimização da extração de Ca, Mg, K, Fe, Zn, Cu e Mn em folhas de braquiária

Souza, Diego Mendes de; Madari, B. E.; Sena, Marcelo M.

doi:10.1590/s0100-40422012000100030

Cited by 3 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results to this study were also observed by Souza et al (2012), the researchers observed significant superiority in the recovery of wet digestion with a mixture of nitric and perchloric acids. In general, the nitric and hydrochloric methods showed efficient precision.…”

Section: Digestions Casupporting

confidence: 92%

Evaluation of methodologies for chemical characterization of vinasse as a function of storage time

Batista-Ventura

Ventura²,

Filho³

et al. 2022

Braz. J. of Sci.

View full text Add to dashboard Cite

The objective of this study was to evaluate efficient analytical methods of wet digestion using the official method of analysis, a mixture of nitric acid and perchloric acid (HNO3 + HClO4), for the analysis of vinasse and also verify the effects of nutrients on stored vinasse. The analytical methods compared were: 1) Nitroperchloric (HNO3), 2) Nitric (HNO3); 3) Chloridric + Hydrogen Peroxide (HCl + H2O2); 4) Sulfuric + Hydrogen Peroxide (H2SO4 + H2O2) and 5) Solubilization with 1 molar Chloridric acid (HCl 1 Mol L-1). Phosphorus, potassium, calcium, magnesium and sulfur were determined over different storage periods, and these nutrients were analyzed at 5, 30, 90 and 150 days of storage, to verify the behavior of these nutrients over the time they are stored in laboratory conditions. The efficiency of the methods was evaluated by comparing the results of the nitroperchloric method obtained for each nutrient with the results obtained from the other methods. The results showed that the nitric (HNO3) and chloridric + hydrogen peroxide (HCl + H2O2) digestions presented good to excellent precision equivalent to the nitroperchloric digestion (HNO3) for the analyzed nutrients. The solubilization method with 1 molar chloridric acid (HCl 1 Mol L-1) presented a low accuracy and did not present the expected efficiency for quantification of any analyzed nutrient. With the exception of potassium contents, all the other nutrients analyzed in the study reduced at the end of the vinasse storage days.

show abstract

Section: Digestions Casupporting

confidence: 92%

Evaluation of methodologies for chemical characterization of vinasse as a function of storage time

Batista-Ventura

Ventura²,

Filho³

et al. 2022

Braz. J. of Sci.

View full text Add to dashboard Cite

show abstract

“…The embryo and seed coat fractions were digested with concentrated perchloric/nitric acid (1/5, v/v) at 60 8C for 12 h, according to the method described by Souza et al (2012), with some modifications. The resultant solution was transferred to a volumetric flask, diluted 10 times with Milli-Q high purity water device (18.2 MV MV cm quality; Millipore, USA).…”

Section: Sample Digestionmentioning

confidence: 99%

Mineral concentrations in the embryo and seed coat of common bean cultivars

Ribeiro

Maziero

Prigol

et al. 2012

Journal of Food Composition and Analysis

View full text Add to dashboard Cite

“…This is important, as it was experimentally observed that level change to a factor can alter other responses with synergistic or antagonistic effect, which it was not possible to assess with univariate studies (Weinert et al, 2008;Breitkreitz et al, 2014). Therefore, factorial design has been used in a diversified way such as in the analysis of metals (Pereira Filho et al, 2002), plants (Marques et al, 2012;Souza and Sena, 2012), and soils (Dolatto et al, 2012). Although there are few results of response surface application, using this tool, it was possible to find the optimum conditions for: (i) extrusion of soybean bran (Barros et al, 1987), (ii) spectrophotometric determination in pharmaceutical formulations (Weinert et al, 2008), and (iii) fruit productivity and quality because of the use of fertilizers (Mattos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Development of Alternative Methods for Determining Soil Organic Matter

Souza

Morais

Matsushige

et al. 2016

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Soil organic matter (SOM) is important to fertility, since it performs several functions such as cycling, water and nutrient retention and soil aggregation, in addition to being an energy requirement for biological activity. This study proposes new trends to the Embrapa, Walkley-Black, and Mebius methods that allowed the determination of SOM by spectrophotometry, increasing functionality. The mass of 500 mg was reduced to 200 mg, generating a mean of 60 % saving of reagents and a decrease of 91 % in the volume of residue generated for the three methods without compromising accuracy and precision. We were able to optimize conditions for the Mebius method and establish the digestion time of maximum recovery of SOM by factorial design and response surface. The methods were validated by the estimate of figures of merits. Between the methods investigated, the optimized Mebius method was best suited for determining SOM, showing near 100 % recovery.

show abstract

Aplicação de métodos quimiométricos na otimização da extração de Ca, Mg, K, Fe, Zn, Cu e Mn em folhas de braquiária

Cited by 3 publications

References 7 publications

Evaluation of methodologies for chemical characterization of vinasse as a function of storage time

Evaluation of methodologies for chemical characterization of vinasse as a function of storage time

Mineral concentrations in the embryo and seed coat of common bean cultivars

Development of Alternative Methods for Determining Soil Organic Matter

Contact Info

Product

Resources

About