Rapid determination of fluoride in mineral and rock samples using an ion-selective electrode

Troll, Georg; Farzaneh, Abbas; Cammann, Karl

doi:10.1016/0009-2541(77)90054-7

Cited by 36 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For Li20 , a separate portion of each sample was digested in an HF-aqua regia mixture in a pressure bomb, and subsequently analysed by atomic emission spectrophotometry using a high-temperature nitrous-oxide-acetylene flame in a Pye Unicam SP1900. Fluorine was determined with a Pye Unican PW9416 selective ion analyser after fusion of another portion of each sample with alkali carbonate in a platinum crucible, dissolution, the addition of TISAB buffer solution and making up to volume following a procedure modified after Troll et al (1977).…”

Section: Methodsmentioning

confidence: 99%

Compositions of trioctahedral micas in the Cornubian batholith

Stone¹

1988

Mineral. mag.

View full text Add to dashboard Cite

New major and trace element chemical analyses of trioctahedral micas of the Cornubian batholith emphasize their enrichment in a 'trace-alkali element' association (Li, Rb, Cs, F, Nb, Mn) and their deficiency in a 'femic element' association (Zr, Ce, Th as well as Mg and Ti) compared with micas from many other granite suites, although there are similarities with some Hercynian granites and with rare metal pegmatites. The new data demonstrate a continuous series from siderophyllite through zinnwaldite to lepidolite, principally as a result of Li-R 2 § substitution as indicated by Foster (1960), although a more complete replacement is (Li, AI) = (Fe z+, Fe 3 § Ti). It is suggested that the ranges of these micas are based upon the Li content in the unit cell formula and the ratio of Li to R 2+, in effect, a compromise between the ranges proposed by Foster (1960) and Rieder (1970). Microprobe analyses lack Li20, but can be plotted on FeO-SiO 2 and FeO-AlzO3-SiO 2 diagrams (wt. or atom %) in order to locate compositions within the trioctahedral LiFe micas and to distinguish between lepidolite and muscovite.An examination of 55 new mica analyses shows that hornfels biotites are richer in Mg and that the Cornubian Type A granite (as classifed by Exley and Stone, 1982) micas are richer in Ti and Fe compared with those of Type B granites. Micas from microgranite dykes appear to be poorer in femic elements and richer in trace alkalis and F compared with their Type B granite hosts, consistent with their differentiation from the latter. Mica chemistry is consistent with the magmatic evolution of the A-B-microgranite sequence in the biotite granites, the transformation of Types B to D upon emplacement of E, the derivation of Types E from B by extreme differentiation or metasomatic transformation and mobilization, and the in situ differentiation of Types G from E.

show abstract

Section: Methodsmentioning

confidence: 99%

Compositions of trioctahedral micas in the Cornubian batholith

Stone¹

1988

Mineral. mag.

View full text Add to dashboard Cite

show abstract

“…All analyses were obtained by standard XRF techniques at the University of Oxford, using fused discs and powderpellets for major and trace elements, respectively. Flourine in schistose rinds was analysed using the ion-sensitive electrode method of Troll et al (1977).…”

Section: Whole Rock Geochemistrymentioning

confidence: 99%

Sapphirine granulites from the Vestfold Hills, East Antarctica: geochemical and metamorphic evolution

Harley

1993

Antartic science

View full text Add to dashboard Cite

A varied suite of sapphirine-bearing and quartz-undersaturated granulites, the Taynaya Paragneiss, occur as boudins and enclaves within the c. 2500 Ma old felsic orthogneisses of northern Vestfold Hills. Highly magnesian varieties with XMg (=100x(Mg/(Mg+Fe)) near 95 preserve the assemblage sapphirine + enstatite + spinel, whereas sapphirine + cordierite + sillimanite + corundum occurs in aluminous and feldspathic types with XMg near 90. Phase equilibria and relative thermometry based on Al2O3 solubility in enstatite indicate equilibration of these assemblages at c. 830–880°C and 0.35–0.85 GPa. There is no evidence for the extreme temperatures (1000–1100°C) previously proposed for early metamorphism in the Vestfold Hills, and no indication in the metamorphic assemblages of isobaric cooling prior to 2500 Ma. Two types of metasomatism have altered the bulk rock compositions near boudin and enclave margins. Cordierite rinds locally formed on corundum-sillimanite granulites reflect interaction with magmatic precursors to the enclosing felsic gneisses, as supported by the isotopic and chemical compositions of cordierite channel volatiles. More extensive metasomatism producing schistose phlogopite + sapphirine rinds on all boudins involved infiltration of a LILE-enriched fluid which introduced K2O, H2O, Fe, Rb, Ba and minor Sr along the boudin margins. Whole rock geochemistry of Taynaya Paragneiss unaffected by this metasomatism is consistent with their derivation from evaporitic mudstones, and implies the existence of a basement older than the dominant 2500 Ma orthogneisses.

show abstract

“…The initial potential reading, taken after one hour and measured while the solution is being stirred will give a measure of the fluorine concentration by reference to a calibration curve prepared from standard fluoride solutions. Alternatively, additions of standard fluoride solution may be made to the rock solution to effect the (21) calibration. An elegant procedure for this has been described by Troll et al (25) Attention has however been drawn to a revision of the derived formula for concentration by the addition technique of Durst.…”

Section: Apparatusmentioning

confidence: 99%

Fluorine

Jeffery¹

1981

Chemical Methods of Rock Analysis

View full text Add to dashboard Cite

Rapid determination of fluoride in mineral and rock samples using an ion-selective electrode

Cited by 36 publications

References 21 publications

Compositions of trioctahedral micas in the Cornubian batholith

Compositions of trioctahedral micas in the Cornubian batholith

Sapphirine granulites from the Vestfold Hills, East Antarctica: geochemical and metamorphic evolution

Fluorine

Contact Info

Product

Resources

About