Pyrohydrolytic-ion chromatographic determination of fluorine, chlorine, and sulfur in geological samples

Evans, Katharine; Tarter, James G.; Moore, C. B.

doi:10.1021/ac00229a050

Cited by 47 publications

(23 citation statements)

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“…All these standards, plus the other 22 for which six analyses were performed on a single bottle, exhibited a relative standard deviation of 1-6% for concentrations of chloride >SO ppm. All determinations were made by the chloride-specific ion-selective electrode method of Aruscavage a n d Campbell with certain refinements.…”

Section: Application Of An Ion-selective E L E C T R O D E Method'to mentioning

confidence: 99%

“…Chloride determinations in rocks in the past two decades have been accomplished principally by one of five techniques, namely, spectrophotometry (1-4), X-ray fluorescence (5)(6)(7)(8), neutron activation (9)(10)(11)(12)(13)(14)(15)(16)(17), ion selective electrodes (18)(19)(20), and ion chromatography (21)(22)(23)(24). Good accuracy and sensitivity at the ppm level are possible with all five approaches.…”

Section: Application Of An Ion-selective E L E C T R O D E Method'to mentioning

confidence: 99%

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Application of an Ion‐Selective Electrode Method to the Determination of Chloride in 41 International Geochemical Reference Materials

Elsheimer

1987

Geostandards Newsletter

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Determinations of trace amounts (with one exception) of chloride are reported for 41 international geochemical reference standards, 12 of which have no previously reported literature values. All determinations were made by the chloride‐specific ion‐selective electrode method of Aruscavage and Campbell with certain refinements. Chlorine is separated from most other elements in geologic materials by acid‐dissolution in a gas diffusion cell, and is subsequently determined as the chloride ion in basic solution. A statistical F‐test was applied to 19 of the standards for which three bottles of each were analyzed in triplicate with no failures. All these standards, plus the other 22 for which six analyses were performed on a single bottle, exhibited a relative standard deviation of 1‐6% for concentrations of chloride >50 ppm. For most samples chloride values agree well both with available, reported experimental values and with recommended or consensus values.

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Section: Application Of An Ion-selective E L E C T R O D E Method'to mentioning

confidence: 99%

Section: Application Of An Ion-selective E L E C T R O D E Method'to mentioning

confidence: 99%

Application of an Ion‐Selective Electrode Method to the Determination of Chloride in 41 International Geochemical Reference Materials

Elsheimer

1987

Geostandards Newsletter

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“…Another method uses combustion of coal in an oxygen bomb followed by washing out the bomb with water and finally determining chloride with an ion-selective electrode. 63 The determination of chloride ions by an ion chromatographic method, which has been used for geological 162 and other samples, would surely be applicable to the bomb washings from the burning of coal, the high sensitivity being an advantage if low concentrations (less than 50 ppm) were of interest.…”

Section: E Chlorinementioning

confidence: 99%

Modern Methods in Bituminous Coal Analysis: Trace Elements

Swaine¹,

Pickering²

1985

C R C Critical Reviews in Analytical Chemistry

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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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Pyrohydrolytic-ion chromatographic determination of fluorine, chlorine, and sulfur in geological samples

Cited by 47 publications

References 10 publications

Application of an Ion‐Selective Electrode Method to the Determination of Chloride in 41 International Geochemical Reference Materials

Application of an Ion‐Selective Electrode Method to the Determination of Chloride in 41 International Geochemical Reference Materials

Modern Methods in Bituminous Coal Analysis: Trace Elements

Determination of fluoride in coal using pyrohydrolysis for analyte separation

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