Fluorine

Allmann, R.; Koritnig, Sigmund

doi:10.1007/978-3-642-65039-0_3

Cited by 5 publications

(4 citation statements)

References 80 publications

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“…The F concentrations vary among localities, averaging 669 ppm (σ = 229, n = 63). This value is similar to those reported for pelite by Allmann and Koritnig (1972) and comparable to the mean value of the continental crust calculated by Rudnick and Gao (2003).…”

Section: Metasedimentary Belt and Basement Rockssupporting

confidence: 89%

“…Partial melting in both the fluid-present and fluid-absent experiments produced glasses with 0.02 to 0.17 wt.% F. These concentrations are typical of natural felsic igneous materials (Allmann and Koritnig, 1972;Bailey, 1977;Sallet, 2000) (Table 9). The fluidabsent experiment glasses contained more F (0.06 b F b 0.17 wt.%) in comparison to those from the fluid-present experiments (0.02 b F b 0.11 wt.%).…”

Section: Glass Chemistrymentioning

confidence: 96%

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Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

et al. 2015

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Section: Metasedimentary Belt and Basement Rockssupporting

confidence: 89%

Section: Glass Chemistrymentioning

confidence: 96%

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

et al. 2015

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“…According to current knowledge fluorine compounds do not play a significant role in any major air-chemical pro- [115,119,122,138]. For the calculation of the atmospheric mass content of fluorine in 2050 the IPCC scenario IS92de [126] was used and constant emissions of CF 4 of 15,000 t yr -1 [89] were assumed cess.…”

Section: Discussionmentioning

confidence: 99%

“…7. Masses of geochemical reservoirs of fluorine using data from [15,119,122,138]. For the calculation of the atmospheric reservoir of 2050 the IPCC scenario IS92de [126] was used and constant emissions of CF 4 of 15,000 t yr -1 [89] were assumed size can be used to obtain a rough measure of the probability of a relevant chemical disturbance of the reservoir-composition.…”

Section: Aspects Of Fluorine Geochemistrymentioning

confidence: 99%

Reactive Fluorine Compounds

Harnisch

The Handbook of Environmental Chemistry

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Human activities have significanty increased the atmospheric concentrations of various compounds of fluorine. The input of such compounds into the environment is expected to grow rapidly in the future. Their environmental fate and impact should thus be carefully assessed. Compounds of fluorine are covered by this chapter if they do not contain other halogens and exhibit at least some economic or environmental relevance. Here, these substances are divided into the following groups: hydrofluorocarbons, perfluorocarbons, further organic fluorine compounds, long-and short-lived inorganic fluorine compounds. Their respective environmental relevance is discussed with special attention to the issues of "global warming","ozone depletion" and to their and their degradation products' toxic effects on the biosphere. A revised picture of the natural geochemistry of atmospheric fluorine is sketched including volcanic emissons, mineral dust, biomass burning, the release from sea-salt aerosol and the degassing of natural tetrafluoromethane. This natural situation is then compared with the anthropogenically disturbed case and a projected scenario for the year 2050.

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X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

Pleßow

2012

X-Ray Spectrometry

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Occasionally suggested yet rarely performed X-ray fluorescence (XRF) spectrometry of fluorine seems to fail systematically in yielding reliable quantitative results for rocks and soils. Repeated analyses reveal continuously drifting fluorescence intensities for fluorine, boron and chlorine. Typically, an increase, but in few cases also a decrease, over X-ray exposure time is observed. For instance, fluorine concentrations in a soil standard appear to increase steadily from below the detection limit in the first run to nearly 850 mg/kg F more than 10 h later in the last. In contrast, cryolite is characterised by drastically decreasing intensities for fluorine. Although fluorescence intensities may be affected by preparation methods, specimen surface conditions and dynamic contamination, it is shown that none of these influencing factors is responsible for the observed trends. In fact, there is evidence that X-radiation impact mobilises fluorine, boron and chlorine. Diffusion of radiolysis products towards the specimen's surface as well as the kinetics of adsorption and desorption or chemical reactions are believed to control the analyte concentration in the analysed layer decisively. Furthermore, during analysis, the latter is altered by considerable losses of binder or fluxif applicable thus enhancing XRF intensities of boron and fluorine because of reduced absorption. In any case, signal stability appears to be limited by insufficient sample and specimen stability. It is concluded that for many soil and rock samples, XRF spectrometry is inappropriate to quantify fluorine, although the crucial obstacle is neither the analytical method nor the spectrometer sensu strictu.

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Fluorine

Cited by 5 publications

References 80 publications

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

Reactive Fluorine Compounds

X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

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