Determination of fluoride in coal using pyrohydrolysis for analyte separation

Dressler, Valderi L.; Pozebon, Dirce; Flores, Éder Lisandro Moraes; Paniz, José Neri Gottfried; Flores, Érico Marlon de Moraes

doi:10.1590/s0103-50532003000200024

Cited by 37 publications

(40 citation statements)

References 20 publications

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“…The pyrohydrolysis reaction can be accelerated in presence of U, V, Al, and W oxides. The volatile halogen species evolved can be simply condensed 33,37 or collected in alkaline solutions such as Na 2 CO 3 , Na 2 CO 3 /NaHCO 3 and (NH 4 ) 2 CO 3 . 24,31 The purpose of the present work was to develop a method for F, Br and I determination in mineral supplements using pyrohydrolysis for sample preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Pyrohydrolysis is a simple alternative for decomposition of organic 7,19,31,33 and inorganic [34][35][36] materials when halogens determination is intended. The main advantages are the possibility of matrix separation and the use of a diluted alkaline solution for analytes absorbing.…”

Section: Introductionmentioning

confidence: 99%

“…20,21 Sample preparation is usually the bottleneck in halogen determination by ICP-MS, due to memory effects caused by high volatility of halogens in acidic solutions. [22][23][24] Therefore, alkaline fusion, 20 dilution or dispersion in alkaline solution, distillation (for fluorine), combustion in bombs, 25 microwave-induced combustion (MIC) 9,26-29 and pyrohydrolysis 7,17,[30][31][32] are used for sample preparation.Pyrohydrolysis is a simple alternative for decomposition of organic 7,19,31,33 and inorganic 34-36 materials when halogens determination is intended. The main advantages are the possibility of matrix separation and the use of a diluted alkaline solution for analytes absorbing.…”

mentioning

confidence: 99%

“…7,33 According to the literature, usually the use of an accelerator is necessary for halogens release from inorganic sample matrixes. 7,24,33,36 However, for other samples, like coal and petroleum coke, halogens are released without any auxiliary reagent. 19,33,38 Figure 2.…”

mentioning

confidence: 99%

“…7,24,33,36 However, for other samples, like coal and petroleum coke, halogens are released without any auxiliary reagent. 19,33,38 Figure 2. Influence of Na 2 CO 3 /NaHCO 3 solution concentration used for collection of Br (¢) and I (¢); error bars are the standard deviations, n = 5.…”

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confidence: 99%

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Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

Taflik

Duarte

Flores

et al. 2012

J. Braz. Chem. Soc.

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Neste trabalho foi utilizada a piroidrólise para a decomposição de suplemento mineral utilizado na nutrição animal, para a posterior determinação de F, Br e I. Flúor foi determinado por potenciometria utilizando eletrodo íon-seletivo para fluoreto, enquanto que Br e I foram determinados por espectrometria de massa com plasma indutivamente acoplado. Os principais parâmetros que influenciam a piroidrólise foram investigados e, após a devida avaliação dos mesmos, foram fixadas as seguintes condições: a temperatura do reator em 1000 °C durante 10 min; a proporção entre a massa de amostra e a massa de acelerador em 1 + 5 e a vazão do gás carreador em 200 mL min -1 . A exatidão do método foi avaliada usando teste de recuperação do analito e análise de materiais de referência certificados de rocha fosfática e de solo. O método foi aplicado para análise de suplemento mineral. Os limites de quantificação foram de 16, 0,3 e 0,07 µg g -1 para F, Br e I, respectivamente. Assim, usando-se um método relativamente simples e de baixo custo é possível a decomposição de até 5 amostras por hora. Portanto, a piroidrólise pode ser usada como um método de rotina para o preparo de amostra de suplemento mineral para a determinação de F, Br e I.Pyrohydrolysis was employed for mineral supplements decomposition prior to F, Br and I determination. Fluoride determination was carried out by potentiometry using a fluoride-ion selective electrode, whereas Br and I were determined by inductively coupled plasma mass spectrometry. The main parameters that influence on pyrohydrolysis were investigated. After evaluation, the following conditions were established: reactor temperature of 1000 °C during 10 min; sample plus accelerator mass ratio of 1 + 5 and carrier gas (air) flow rate of 200 mL min -1 . The accuracy of the proposed method was evaluated by analyte recovery tests and analysis of certified reference materials of phosphate rock and soil. Commercial mineral supplement samples were analyzed. The limits of quantification were 16, 0.3 and 0.07 µg g -1 for F, Br and I, respectively. By using a relatively simple and low cost pyrohydrolysis system up to 5 samples can be processed per hour. The developed sample preparation procedure can be routinely employed for F, Br and I determination in mineral supplements. Keywords: pyrohydrolysis, halogens determination, mineral supplement IntroductionSeveral elements are essential for animals growing and breeding. Those elements required in high amounts are called macronutrients (Ca, Cl, K, P, Mg, Na, and S) and those elements required in low concentrations are called micronutrients (Co, Cu, Fe, I, Mn, Mo, Se, Zn, and eventually Cr and F are included in this group). 1 The main functions of essential elements in the organism are associated to the structural composition of body and enzymatic and hormonal processes.Although F usually increases the strength of bones and teeth, this element is generally not considered as essential. 1 Fluorine is usually present as a contaminant since it is Taflik et al. 489 ...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

Taflik

Duarte

Flores

et al. 2012

J. Braz. Chem. Soc.

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The Effect of MgO‐MgF₂ Synthesis Method on the Electrolyte Binding Ability in Thermal Batteries

et al. 2018

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This paper describes a comparative study of synthesis (sol-gel and suspension methods) of MgF 2 -MgO material used as an immobilizing agent of the electrolyte (KCl-LiCl-RbCl) for high temperature cells. Samples containing 20 mol.% MgF 2 obtained by the sol-gel method, followed by calcination at 500 and 600 o C, were characterized by large specific surface areas greater than those of samples obtained by the suspension method. It was demonstrated that pellets containing 40 wt.% immobilizing agent composed of 20 mol.% MgF 2 -80 mol.% MgO, obtained by the sol-gel method, and calcinated at 500 8C, were good electrolyte immobilizers. This mixture remains dimensionally stable at 400 8C and under 60 kPa pressure (no leakage of the electrolyte was observed) and reveals good ionic conductivity during tests in a model cell -the voltage was not less than 1.0 V and current more than 0.75 A for approximately 400 s.

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Analytical methods for the determination of halogens in bioanalytical sciences: a review

et al. 2013

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Fluorine, chlorine, bromine, and iodine have been studied in biological samples and other related matrices owing to the need to understand the biochemical effects in living organisms. In this review, the works published in last 20 years are covered, and the main topics related to sample preparation methods and analytical techniques commonly used for fluorine, chlorine, bromine, and iodine determination in biological samples, food, drugs, and plants used as food or with medical applications are discussed. The commonest sample preparation methods, as extraction and decomposition using combustion and pyrohydrolysis, are reviewed, as well as spectrometric and electroanalytical techniques, spectrophotometry, total reflection X-ray fluorescence, neutron activation analysis, and separation systems using chromatography and electrophoresis. On this aspect, the main analytical challenges and drawbacks are highlighted. A discussion related to the availability of certified reference materials for evaluation of accuracy is also included, as well as a discussion of the official methods used as references for the determination of halogens in the samples covered in this review.

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Determination of fluoride in coal using pyrohydrolysis for analyte separation

Cited by 37 publications

References 20 publications

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

The Effect of MgO‐MgF₂ Synthesis Method on the Electrolyte Binding Ability in Thermal Batteries

Analytical methods for the determination of halogens in bioanalytical sciences: a review

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Determination of fluoride in coal using pyrohydrolysis for analyte separation

Cited by 37 publications

References 20 publications

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

Determination of bromine, fluorine and iodine in mineral supplements using pyrohydrolysis for sample preparation

The Effect of MgO‐MgF2 Synthesis Method on the Electrolyte Binding Ability in Thermal Batteries

Analytical methods for the determination of halogens in bioanalytical sciences: a review

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The Effect of MgO‐MgF₂ Synthesis Method on the Electrolyte Binding Ability in Thermal Batteries