Pyrolytic Separation and Determination of Fluoride in Raw Materials

Nardozzi, M. J.; Lewis, L.

doi:10.1021/ac60177a040

Cited by 30 publications

(7 citation statements)

References 6 publications

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“…It is worth mentioning that in this study [9] when a quartz reaction tube was substituted for 96% silica reaction tube the fluoride recovery was incomplete. This incomplete recovery was attributed to the reaction of fluoride with boron in the 96% silica glass to form compounds that were not hydrolyzed completely in the receiving flask to yield free fluoride ion [9].…”

Section: Discussionmentioning

confidence: 77%

“…According to the literature only acidic oxides act as accelerators. It appears that these oxides take part in replacement reactions [9].…”

Section: Discussionmentioning

confidence: 99%

“…This incomplete recovery was attributed to the reaction of fluoride with boron in the 96% silica glass to form compounds that were not hydrolyzed completely in the receiving flask to yield free fluoride ion [9].…”

Section: Discussionmentioning

confidence: 99%

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Paradoxes and paradigms: Observations on pyrohydrolytic decomposition of fluorine-containg materials and accompanying thermochemistry

Ponikvar

Liebman

2006

Struct Chem

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Pyrohydrolysis is a fast, reliable and convenient method for the decomposition of solid samples. It is widely used for decomposition of samples containing fluorine. The efficiency of different accelerators for pyrohydrolytic decomposition and subsequent determination of fluoride in some raw materials, industrial products and pure CaF 2 was studied. A brief discussion on thermochemistry of these reactions is provided.

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Section: Discussionmentioning

confidence: 77%

“…According to the literature only acidic oxides act as accelerators. It appears that these oxides take part in replacement reactions [9].…”

Section: Discussionmentioning

confidence: 99%

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Paradoxes and paradigms: Observations on pyrohydrolytic decomposition of fluorine-containg materials and accompanying thermochemistry

Ponikvar

Liebman

2006

Struct Chem

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“…In the classical Willard-Winter 123 distillation procedure introduced in 1933, decomposition of compounds and separation of resulting fluoride from interfering substances take place concurrently. This technique and its modifications [124][125][126] have provided a wealth of information through the middle decades of the 20 th century but, mostly because of its cumbersome procedure, have been replaced by simpler methods, like pyrohydrolysis 127,128 or diffusion methods. [129][130][131] Commonly used procedures nowadays for total sample decomposition involve oxygen bomb combustion, 132,133 open ashing 134,135 fusion with alkali metal hydroxides or carbonates 136,137 and microwave acid digestion.…”

Section: 2 Total Fluorinementioning

confidence: 99%

Fluoride in Human Health and Nutrition

Štepec

Ponikvar‐Svet

2019

ACSi

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Fluorine is in the form of fluorides ubiquitous in nature and as such an inevitable part of our environment. In small amounts, it is known to have beneficial effects on dental health. On the other hand, excessive chronic intakes can result in adverse effects including the development of dental fluorosis in children and/or skeletal fluorosis in both children and adults. The adequate intake has been set, based on empirical observations, at 0.05 mg/day/kg body weight however, the threshold between beneficial and harmful effects is narrow. Despite numerous studies, knowledge on the fluoride toxicity is still relatively poor. In this review, the role and the effects of fluoride on human health are enlightened. Some of the fluoride controversies are discussed and future research directions suggested.

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“…In order to improve the kinetics of pyrohydrolysis accelerators or catalysts or fluxes are mixed with the samples having slow kinetics. The commonly known accelerators or catalysts or fluxes are U 3 O 8 3,4 V 2 O 5 5 WO 3 6 and SiO 2 7 and in such case the sample to accelerator mass ratio is required to be optimised to achieve the complete recovery of analytes within the acceptable time of pyrohydrolysis. The volatile acids are condensed and trapped in a dilute alkaline trapping solution, which is more often a dilute solution of NaOH or Na 2 CO 3 .…”

Section: Introductionmentioning

confidence: 99%

Pyrohydrolysis, a clean separation method for separating non-metals directly from solid matrix

Vg¹,

Jeyakumar²

2018

OAJS

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Pyrohydrolysis is a sample preparation technique widely employed for the separation of fluorine, chlorine, bromine, iodine, boron and sulphur from solid samples which include refractive materials that are difficult to dissolve. There is a growing interest in the application of this technique to samples of diverse nature. Pyrohydrolysis is based on the principle that pulverization of a soild sample due to the combined action of heat and steam at high temperature produces volatile compounds of the analytes which are trapped in an alkaline solution for subsequent analysis. Studies reported in the recent past have investigated the effect of various pyrohydrolysis conditions required to pulverise the matrix as well as to convert the analytes into their volatile oxides. Hence, the physico-chemical investigation on one type of the sample is different from the other and such information is very useful while dealing with a new material for its pyrohydrolysis. This mini review is an attempt to highlight a few pyrohydrolytic separations which have significant importance.

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Pyrolytic Separation and Determination of Fluoride in Raw Materials

Cited by 30 publications

References 6 publications

Paradoxes and paradigms: Observations on pyrohydrolytic decomposition of fluorine-containg materials and accompanying thermochemistry

Paradoxes and paradigms: Observations on pyrohydrolytic decomposition of fluorine-containg materials and accompanying thermochemistry

Fluoride in Human Health and Nutrition

Pyrohydrolysis, a clean separation method for separating non-metals directly from solid matrix

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