Multivariate optimization of a spectrophotometric method for copper determination in Brazilian sugar-cane spirits using the Doehlert design

Caldas, Luiz Fernando S.; Francisco, Barbara Bruna A.; Netto, Annibal Duarte Pereira; Cassella, Ricardo J.

doi:10.1016/j.microc.2011.04.008

Cited by 28 publications

(16 citation statements)

References 22 publications

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“…ICP-MS is applied for determining individual trace elements {e.g., As [1,6], Al [2], Cd [2], Cu [9], Pb [1,2,6,48], and Sb [35]} or multi-elemental analysis, where different trace and ultratrace elements are determined [23,28,42]. ICP-OES is exclusively used for such multi-elemental determinations [5,7,[10][11][12]29,30,36,[39][40][41][42]45,47].…”

Section: Methods Of Choice For Elemental Analysis Of Spirit Productsmentioning

confidence: 99%

“…Accordingly, permissible levels of selected trace elements in these products are given as the following: 10 mg L -1 , 10 mg L -1 , 0.5 mg L -1 and 2 mg L -1 , respectively for As, Cu, Pb and Zn [25] in Serbia, 0.1 mg L -1 , 5 mg L -1 and 0.2 mg L -1 , respectively for As, Cu and Pb [1,3,[6][7][8]16,29,33,36] in Brazil, 10 mg L -1 , 1 mg L -1 and 10 mg L -1 , respectively for Cu, Pb and Zn, [2,5,14] in Spain, and 4 mg L -1 and 2 mg L -1 , respectively for Cu and Fe [13,27] in Venezuela. Apart from verification of the quality and the safety of distilled spirits, their reliable elemental analysis is important from a marketing point of view {i.e., to guarantee the products are genuine and of superior quality, particularly when these products are declared as possessing a certified brand of origin (CBO) label [1,2,6,7,31,37,38]. …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Advances in assessing the elemental composition of distilled spirits using atomic spectrometry

Szymczycha‐Madeja

Wełna

Jamróz

et al. 2015

TrAC Trends in Analytical Chemistry

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Section: Methods Of Choice For Elemental Analysis Of Spirit Productsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in assessing the elemental composition of distilled spirits using atomic spectrometry

Szymczycha‐Madeja

Wełna

Jamróz

et al. 2015

TrAC Trends in Analytical Chemistry

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“…The Doehlert design is the two-level full factorial design that does not have any classical characteristics of RSM. The Doehlert matrix is similar to BBD but requires fewer experiments (30,31). Therefore, the BBD technique is a suitable and effective method (29).…”

Section: Introductionmentioning

confidence: 99%

Modeling Nitrate Removal by Nano-Scaled Zero-Valent Iron Using Response Surface Methodology

2014

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Background: Contamination of water resources with nitrate is a serious environmental problem in many regions of the world. In addition, this problem has been observed in some regions of Iran. As Nitrate is threatening for human health and environment, it must be decreased to standard levels in drinking water. Objectives: The purpose of this research was to model the nitrate removal from water by nano-scaled zero-valent iron (nZVI) using response surface methodology and to investigate the effects of the nZVI dose, nitrate concentration, contact time, and ionic strength on removal efficiency. Materials and Methods: Box-Behnken design was used. Response surface methodology was used for modeling nitrate removal. All experiments were conducted according to standard methods. Important assessed parameters included nZVI dose (0.5-2 g/L), nitrate concentration (50-150 mg/L), contact time (15-60 minutes), and ionic strength (1000-5000 μmho/cm). Results: Results indicated that there was a direct association between nitrate removal efficiency and time and nZVI dosage. Therefore, increasing of the contact time or nZVI dose would increase nitrate removal. On the other hand, the nitrate removal was decreased when ionic strength and initial concentration were increased. The analysis of variance revealed that the proposed regression model could be appropriately used to design experiments. The model correlation coefficient was 0.9992 and the adjusted value was 0.9982. Conclusions: Response surface methodology and Box-Behnken design were powerful statistical tools for navigating nitrate reduction process. The results showed that a high percentage of nitrate were reduced by nZVI and this method might be efficiently used for nitrate removal from water.

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“…The contamination occurs during the distillation process, when the copper that comprises the internal walls of the still is exposed to humid air containing carbon dioxide, becoming slowly oxidized and coated with a greencolored layer of copper(II) dihydroxycarbonate (CuCO 3 Cu(OH) 2 ), commonly known as verdigris. This compound can be dissolved by the acidic and alcoholic vapors, hence contaminating the distillate 11,18,[20][21][22] . For these reasons, the copper content of sugarcane spirit is regulated by national legislation, with a maximum concentration of 5.00 mg L -1 permitted in commercial products 17,23 .…”

Section: Introductionmentioning

confidence: 99%

Determination of copper in sugarcane spirit by flame atomic absorption spectrometry using a ternary solvent mixture (water-ethanol-acetone)

et al. 2017

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ABSTRACT:The present work describes the use of a homogeneous ternary mixture of the solvents water, ethanol, and acetone to improve the determination of copper in sugarcane spirit by flame atomic absorption spectrometry. The solvent ratio used (on a volume basis) was 5.0:5.0:15.0 (water:ethanol:acetone). The analytical curve for copper was linear up to a concentration of 6.00 mg L -1 of copper, and could be described by the equation: ΔAbs = 0.1778C Cu + 0.0048 (r 2 = 0.9999), and limits of detection and quantification (calculated using the standard deviation of the blank) were 0.01 and 0.05 mg L -1 of copper, respectively. Use of the proposed homogeneous ternary solvent system provided good stability and a significant increase in sensitivity compared to reference methodology. This increase in sensitivity enables the detection of smaller quantities of copper in sugarcane spirit. The method was applied to determine copper in commercial brands of sugarcane spirits. The results obtained by the proposed method were favorably compared with those given by the reference method.

show abstract

Multivariate optimization of a spectrophotometric method for copper determination in Brazilian sugar-cane spirits using the Doehlert design

Cited by 28 publications

References 22 publications

Advances in assessing the elemental composition of distilled spirits using atomic spectrometry

Advances in assessing the elemental composition of distilled spirits using atomic spectrometry

Modeling Nitrate Removal by Nano-Scaled Zero-Valent Iron Using Response Surface Methodology

Determination of copper in sugarcane spirit by flame atomic absorption spectrometry using a ternary solvent mixture (water-ethanol-acetone)

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