A die for pelletizing samples for X‐ray fluorescence analysis

Fabbi, B. P.

doi:10.1002/xrs.1300010108

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…XRF analyses were performed on a Philips PW 1480 instrument at the Smithsonian using a Sc-Mo X-ray tube and analyzed in a single batch to maximize precision. Analytical procedures essentially followed those of Fabbi [1970Fabbi [ , 1972, using U.S. Geological Survey (USGS) standards and monitoring for instrument drift In weight percent; An, anorthite; Ab, albite; Or, orthoclase; P, phenocryst; M, microphenocryst; G, groundmass; C, core; R, rim.…”

Section: Introductionmentioning

confidence: 99%

Fernandina Volcano's evolved, well‐mixed basalts: Mineralogical and petrological constraints on the nature of the Galapagos plume

Allan¹,

Simkin²

2000

J. Geophys. Res.

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MgO. Cr-spinel and glass melt inclusions in plagioclase, together with zoned olivine, give evidence for a range of parental melts in the recent shallow magmatic system, with Mg # as high as 0.62. Extensive, shallow magma mixing is required to explain these variations in mineral and inclusion chemistry, indicating more thermal variation within the shallow magmatic system than is implied by the relatively monotonous whole rock compositions. Apparently, Fernandina's shallow magma chamber has physically blocked passage of more primitive magmas to the surface and homogenized the erupted lavas by extensive mixing. Small variations in lava isotopic and compatible element composition, combined with the need to resupply melt to maintain thermal balance, indicate that replenishment of the magma chamber is semicontinuous, with resupply occurring of the order of a decade or less. Plagioclase-dominated, evolved Fernandina lavas are in sharp contrast to more primitive, olivine-dominated Hawaiian lavas; the total lack of primitive melts in the shallow Fernandina magmatic system implies that substantial fractionation and heat loss occurred during melt transportation from the mantle source to the edifice magma chamber, despite the fact that these melts were transported through relatively warm, young, and thin lithosphere adjacent to the Cocos-Nazca ridge. The diffuse nature of Galapagos volcanism, with 20th century eruptions from eight distinct volcanoes over a 2 20,000 km area, further supports this interpretation and suggests that the Galapagos plume is relatively diffuse, weak, and significantly less thermally intense than the vigorous Hawaiian plume. It may in fact be waning.

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Section: Introductionmentioning

confidence: 99%

Fernandina Volcano's evolved, well‐mixed basalts: Mineralogical and petrological constraints on the nature of the Galapagos plume

Allan¹,

Simkin²

2000

J. Geophys. Res.

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“…Quantitatively transfer the cellulose to a boron carbide mortar and continue to grind and mix for five minutes. Transfer the solid to the pelletizing die lined with a glass disk (Fabbi, 1972) and press the cellulose with a 72 percent cellulose acetate-28 percent paraffin wax backing at 25,000 psi for one minute.…”

Section: Methodsmentioning

confidence: 99%

X-ray spectrometric determinations of arsenic sorbed onto cellulose after solvent extraction from fused silicate rocks

Vivit¹,

Lindsay²

1987

Open-File Report

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The determination of arsenic in silicate rocks is achieved by X-ray fluorescence spectrometry after the arsenic is sorbed onto cellulose and the cellulose briquetted into a sample specimen. The rocks are first decomposed by fusion with sodium hydroxide and then acidified with sulfuric acid. In order to remove any lead which will interfere with the As determination (Pb La peak on the As Ka peak), following reduction of any As(V) present to As(III) with ascorbic acid, Nal is added to form the arseno-iodide complex which is extracted with toluene. The extract is deposited on cellulose and the toluene is evaporated prior to final specimen preparation. The relative precision is from 0.7 to 5.7 percent for the range of 0.06 to 2.37 percent As in the rock. The detection limit is 15 ppm in 250 mg of rock. Results for As found in international rock standards and a series of jasperoid rocks are compared to previously reported values and to values obtained by inductively-coupled plasma emission spectrometry.

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“…The quantitatively retrieved rock powder was then mixed with 0.15-g chromatographic grade Whatman cellulose in a mortar and pestle and reground in a ball mill. The mixture was pressed into a pellet at 30,000 psi using a backing composed of a special wax (Buhrke) and methyl cellulose in a 28:72 ration, and utilizing a USGS-designed pelletizing die (Fabbi, 1970). The relative error for chlorine was 4% with lower and upper detection limits of 0.002% and 2.5%, respectively (King and others, 1978).…”

Section: Menlo Park Laboratory Analytical Proceduresmentioning

confidence: 99%

Major element X-ray fluorescence analyses of rock samples from the Selway-Bitterroot Wilderness, Idaho County, Idaho, and Missoula and Ravalli counties, Montana

Koesterer¹,

Bartel²,

Elsheimer³

et al. 1982

Open-File Report

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A die for pelletizing samples for X‐ray fluorescence analysis

Cited by 10 publications

References 2 publications

Fernandina Volcano's evolved, well‐mixed basalts: Mineralogical and petrological constraints on the nature of the Galapagos plume

Fernandina Volcano's evolved, well‐mixed basalts: Mineralogical and petrological constraints on the nature of the Galapagos plume

X-ray spectrometric determinations of arsenic sorbed onto cellulose after solvent extraction from fused silicate rocks

Major element X-ray fluorescence analyses of rock samples from the Selway-Bitterroot Wilderness, Idaho County, Idaho, and Missoula and Ravalli counties, Montana

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