Hydropyrolytic-ion chromatography determination of fluoride in coal and geological materials

Conrad, Vincent B.; Brownlee, W. D.

doi:10.1021/ac00155a020

Cited by 25 publications

(11 citation statements)

References 30 publications

(21 reference statements)

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“…Determination of F − can be carried out using techniques like ion chromatography or capillary zone electrophoresis [7][8][9]. Although most of these methods show high sensitivity, they have seldom been used in field analysis because of their non-portability, strict requirements for laboratory facilities and technical operators.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of the fluoride induced SiO bond cleavage and functionalized gold nanoparticle aggregation into one colorimetric probe for highly specific and sensitive detection of fluoride

Sun

Zhang

et al. 2014

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 99%

Incorporation of the fluoride induced SiO bond cleavage and functionalized gold nanoparticle aggregation into one colorimetric probe for highly specific and sensitive detection of fluoride

Sun

Zhang

et al. 2014

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 99%

“…Therefore the time necessary for pyrohydrolysis can change according to sample matrix, analyte concentration and also the characteristics of the pyrohydrolysis system employed. 17,19,32,37,39 In comparison with other sample preparation techniques 10,20,25 for subsequent halogens determination, the pyrohydrolysis method proposed in this work can be considered relatively fast because up to 5 samples can be decomposed in 1 h. …”

mentioning

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.…”

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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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“…Some methods employed mixtures of vanadium(V) oxide with other substances (bismuth oxide, tungsten oxide, molybdenum oxide, silicon oxide, nickel, iron, tin, or potassium dihydrogen phosphate). [11][12][13][14] These mixtures can be prepared in bulk or mixed with the sample as required.…”

Section: Introductionmentioning

confidence: 99%

Determination of fluoride in coal using pyrohydrolysis for analyte separation

Dressler¹,

Pozebon²,

Flores³

et al. 2003

J. Braz. Chem. Soc.

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É proposto um método para a determinação de fluoreto em carvão mineral. O mesmo é baseado no emprego da pirohidrólise para a separação do fluoreto da amostra e posterior determinação do analito por potenciometria direta, com eletrodo íon seletivo. O sistema utilizado para a realização da pirohidrólise foi desenvolvido e a influência do V 2 O 5 como catalisador na reação de pirohidrólise foi investigada, sendo verificado que o mesmo não influencia sobre a liberação do fluoreto presente na amostra. Amostras certificadas e não certificadas de carvão mineral foram analisadas. Resultados precisos (desvio padrão relativo inferior a 7%) e exatos (recuperação do fluoreto de acordo com os valores certificados) foram obtidos. O limite de quantificação (LOQ) do método foi de 5,0 µgF/g de amostra, usando 20 mg de amostra e volume final de 10 mL. A freqüência de análise foi de 5 amostras h -1 .A method for the determination of fluoride in coal using pyrohydrolysis for sample decomposition is proposed. An apparatus was constructed, and the influence of vanadium pentoxide (V 2 O 5 ) as a catalyst for the pyrohydrolysis reaction was investigated. It was verified that V 2 O 5 does not influence the release of fluoride from coal. Certified and non-certified samples were analysed using an ion selective electrode (ISE) for analyte detection. Precise (RSD < 7%) and accurate (recovery in accordance with certified values) results were obtained. The limit of quantification (LOQ) of the method was 5.0 µgF/g of sample, using 20 mg of sample and a final dilution to 10 mL. The sample frequency was 5 samples h -1 .Keywords: coal, fluoride, pyrohydrolysis, ion electrode, vanadium pentoxide, catalyst IntroductionFluorine is one of several trace elements receiving much attention owing to its possible harmful ecological effects. This element is considered essential to both plant and animal life at low concentrations but is toxic at high concentrations. The potential toxicity of fluorine has been classified as "high" for terrestrial life and "low" for aquatic life. 1,2 Due to the high volatility of the element, the widespread world consumption of coal may result in significant fluorine emissions. 2 From this point of view, it is important to establish accurate, precise and rapid methods for determination of this element.With the exception of a few instrumental methods, 2,3 the determination of fluoride in coal is carried out after sample dissolution. Most published methods related to the determination of fluoride in solid samples thus involve distillation, pyrohydrolysis, alkaline fusion, combustion bomb or acid decomposition in a bomb, typically followed by spectrophotometric or potentiometric measurements. 3,4 In some instances, these methods are complex and time consuming (mainly methods based on distillation and fusion), may give incomplete breakdown of fluorinecontaining compounds, analyte losses during the depressurisation of the bomb (decomposition in a combustion bomb), or by volatilisation (alkaline fusion), if the fusion temperature is...

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Hydropyrolytic-ion chromatography determination of fluoride in coal and geological materials

Cited by 25 publications

References 30 publications

Incorporation of the fluoride induced SiO bond cleavage and functionalized gold nanoparticle aggregation into one colorimetric probe for highly specific and sensitive detection of fluoride

Incorporation of the fluoride induced SiO bond cleavage and functionalized gold nanoparticle aggregation into one colorimetric probe for highly specific and sensitive detection of fluoride

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

Determination of fluoride in coal using pyrohydrolysis for analyte separation

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