A Method of Producing Sturdy Specimens of Pressed Powders for Use in X-ray Spectrochemical Analysis

Bean, Leonard

doi:10.1366/000370266774386227

Cited by 3 publications

(5 citation statements)

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“…Retcofsky et al (3,4) obtained a reasonable correlation of ESR line width with hydrogen content of the vitrains. They proposed that the variation of the line width with coal rank is a direct result of spin-spin interactions between the free radicals, electrons, and protons in the coal.…”

Section: Methodsmentioning

confidence: 86%

“…ESR has been proved a valuable tool in the study of the free radicals in coal (1)(2)(3)(4)(5). The origin of the free radicals in coal and subsequent change in the quantity and nature of the radicals with coal rank is an important part of coal metamorphosis.…”

Section: Methodsmentioning

confidence: 99%

“…An automated multielement successor to this instrument is now on the market, however, and it is to be expected that our technique could readily be adapted to it. ESR has been proved a valuable tool in the study of the free radicals in coal (1)(2)(3)(4)(5). The origin of the free radicals in coal and subsequent change in the quantity and nature of the radicals with coal rank is an important part of coal metamorphosis.…”

Section: (4)mentioning

confidence: 99%

“…and line shape. Correlations have been made for Hg and g-value with respect to a number of parameters related to coal rank (1)(2)(3)(4)(5). However, the utilization of line shape and line width data has been scarce and no definite conclusions have been drawn (3, 4).…”

Section: (4)mentioning

confidence: 99%

“…The use of XRFs for this purpose, however, has two principal disadvantages: it is unsuitable for the determination of any trace element for which Z < 10, and, for routine bulk analysis (SiOo, A1203. Fe203, MgO, CaO, Na20, K20, Ti02, P205, and MnO) and/or stable isotope trace element analysis (Ba, Co, Cr, Cu, Mb, Ni, Rb, Sr, V, Y, Zn, and/or Zr), rock samples weighing 3-6 g are required (3,4). It should be mentioned, however, that partially successful efforts (5,6) have recently been made to overcome this latter limitation.…”

mentioning

confidence: 99%

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Major and minor oxide and trace element determination in silicate rocks by direct current plasma optical emission echelle spectrometry

Bankston¹,

Humphris²,

Thompson³

1979

Anal. Chem.

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A technique for the determination of major concentrations of SiOz, AI,O,, Fe203, MgO, CaO, Na,O, and K,O, minor levels of Ti O,, P,O,, and MnO, and trace concentrations of Ba, Cr,Cu, Ni, Sr, V, and Zn, in semi-microsamples (200 mg) of powdered whole rock, is described. Chemically diverse standard reference rocks are used both for calibration and assessment of accuracy. A lithium metaborate fusion melt of each standard or sample is dissolved in dilute HNO, containing CS+ at a level of 0.2% (w/v). The resulting solution is used to perform all analyses except those for NapO and K20, which are determined in a portion of the original sample solution wherein the Cs' concentration has been raised to 0.32% (w/v). Analyses of both portions of each sample solution are performed using an optical emission spectrometerhpectrograph equipped with an echelle monochromator and a dc argon plasma excitation source. Trace element detection limits ranged from 2 ppm for Cu to 15 ppm for Zn. A study of precision based on replicate determinations in three splits of the proposed USGS reference basalt BHVO-1 yielded the following results: (1) For analyses of the major and minor oxide constituents, values of the percent relative standard deviation (RSD) ranged from 1 for CaO, to 21 for P,O,. (2) For trace element determinations, values of the RSD ranged from 2 for Cu, to 19 for Zn.Instrumental determinations of the bulk oxide and trace element compositions of silicate rocks of various types are commonly beset by several problems. It often happens that many analyses must be made of each sample unknown, of which only a smail amount is available, and that several of the trace elements are present a t concentrations in the low ppm range. Moreover, since any specimen of rock is a more or less heterogeneous mixture, the representativeness of its analyzed subsample can legitimately be questioned. In addition, the great complexity and variability of the major and minor element constituencies of silicate rocks engender matrix effects.Since 1970, X-ray fluorescence (XRFs) and atomic absorption spectrometry (AAS) have provided the instrumental techniques most widely employed for the analyses of metals and metalloids in geological materials (1,Z). The use of XRFs for this purpose, however, has two principal disadvantages: it is unsuitable for the determination of any trace element for which 2 < io, and, for routine bulk analysis ( S O 2 , Al2O3.FeLO,, MgO. CaO, Na70, K@, TiOL, P205, and MnO) and /or

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Section: Methodsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: (4)mentioning

confidence: 99%

Section: (4)mentioning

confidence: 99%

mentioning

confidence: 99%

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Major and minor oxide and trace element determination in silicate rocks by direct current plasma optical emission echelle spectrometry

Bankston¹,

Humphris²,

Thompson³

1979

Anal. Chem.

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A die for pelletizing samples for X‐ray fluorescence analysis

Fabbi

1972

X-Ray Spectrometry

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The preparation of pellets of powdered geological samples is a critical step in X‐ray fluorescence analysis. A special die has been designed to produce smooth surfaces on extremely durable pellets and to provide a protective, hard outer ring and backing. The outer ring minimises the deterioration of the edge that has in the past limited the usable life of the pellet. Repetitive preparations have shown reproducibility and homogeneity to be within normal counting statistics.

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Präparationstechnik in der RFA

Dümecke¹,

Höppner²

1989

Röntgenfluoreszenzanalyse

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A Method of Producing Sturdy Specimens of Pressed Powders for Use in X-ray Spectrochemical Analysis

Cited by 3 publications

References 1 publication

Major and minor oxide and trace element determination in silicate rocks by direct current plasma optical emission echelle spectrometry

Major and minor oxide and trace element determination in silicate rocks by direct current plasma optical emission echelle spectrometry

A die for pelletizing samples for X‐ray fluorescence analysis

Präparationstechnik in der RFA

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