The effect of halide carriers in the spectrographic examination of trace impurities in copper

Tymchuk, P.; Russell, D. S.; Berman, S. S.

doi:10.1016/0371-1951(65)80221-1

Cited by 20 publications

(7 citation statements)

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“…As explained above solid halogenating modifiers were used successfully in the globule arc technique. 17,18 It was also described in ref. 10 and 16 that only in a molten state the vaporization/ distillation of the analytes out of the copper matrix takes place.…”

Section: Basic Consideration Of the Etv-icp Oes Methods For Coppermentioning

confidence: 80%

“…The globule arc technique was studied and applied to the determination of trace elements in copper by Price 15 in 1960 and a modification of this technique was applied to the determination of more than 30 trace elements in pure copper at low mg kg À1 level and below by Publicover 16 in 1965 together with a method to prepare calibration materials from binary master alloys. Furthermore, also in the sixties, Tymchuk et al 17 reported the enhancement of emission signals by the addition of halogenating substances (''carrier'') to the samples in arc analysis. They also described a spectrochemical arc method 18 using copper fluoride as a ''carrier'' for the quantitative determination of 38 elements and it was found that most of the elements were effectively distilled within 10 seconds of DC arc exposure, whereas the main part of the copper sample remained in the carrier electrode.…”

Section: Direct Solid Sampling Methodsmentioning

confidence: 99%

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Determination of trace elements in high-purity copper by ETV-ICP OES using halocarbons as chemical modifiers

Haßler¹,

Barth²,

Richter

et al. 2011

J. Anal. At. Spectrom.

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Section: Basic Consideration Of the Etv-icp Oes Methods For Coppermentioning

confidence: 80%

Section: Direct Solid Sampling Methodsmentioning

confidence: 99%

Determination of trace elements in high-purity copper by ETV-ICP OES using halocarbons as chemical modifiers

Haßler¹,

Barth²,

Richter

et al. 2011

J. Anal. At. Spectrom.

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“…(The impurity levels were determined by the Analytical Chemistry Section, National Research Council, using a spectroscopic carrier distillation method. 5 ) Thus the nuclear term does appear to be a property of the alloy and not the result of impurity or experimental effects.…”

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confidence: 99%

“…5, it was necessary, to make the computation of A (2) tt(0) tractable, to employ a static limit for the full dynamic potential. 9 Also a spherical average over the directions of p was introduced.…”

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confidence: 99%

“…Most of the effort has been devoted to iron-group ions; however, UPR investigations on rare-earth ions have also been reported. 5 ? 6 The results reported here were obtained during a general investigation of spin-lattice interactions in calcium fluoride containing various rare-earth ions with particular emphasis on the comparison of electronically similar non-Kramers lanthanide and actinide ions.…”

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confidence: 99%

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Nuclear Specific Heat of Gold-Silver Alloys

Martin

1967

Phys. Rev. Lett.

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PHYSICAL REVIEW LETTERS 15 MAY 1967 in Ref. 5, it was necessary, to make the computation of A (2) tt(0) tractable, to employ a static limit for the full dynamic potential. 9 Also a spherical average over the directions of p was introduced. It should be stressed, however, that it was not possible to show that the analytic expressions .themselves ensure positive definiteness. In fact, they almost certainly do not. Nevertheless, the remaining descrepancy for a = 0.25 is small as compared to the RPA result, which in absolute value comes out to be more than twice the average electron density.We have shown that the same difficulties arise, at short distances, in the RPA calculation of the displaced charge about a light test charge as is encountered in the calculation of the spinup-spin-down pair distribution function in an imperfect electron gas. Further, we have managed to show how these difficulties can be removed to a large extent by simply summing ladders. We conclude that when, calculating properties of an electron gas, such as g\\(r), which depend mainly on the short-range correlations, it is essential to metallic densities to treat particle-particle ladders. A detailed calculation of the Coulomb hole at finite dis-Pure gold 1 ' 2 (nuclear spin /= f) and silver 3 (7=1) do not show a nuclear specific heat because there is no electronic magnetic moment to interact with the nuclear magnetic moment and the degeneracy associated with the nuclear electric quadrupole moment of gold is not removed in the symmetrical cubic environment. However, although gold-silver alloys are facecentered cubic (fee) for all compositions, they show no long-range order and, therefore, the cubic symmetry is disturbed. This may be the explanation of a term proportional to 7"~2 observed in the specific heat of these alloys and presumed to be a nuclear specific heat.The solid points in Fig. 1 show the results tances will be presented elsewhere. It is a pleasure to thank my colleague Ed Woll, Jr., for discussion. . 4 B. Bergersen, thesis, Brandeis University, 1964 (unpublished). 5 J. P. Carbotte, Phys. Rev. 155, 197 (1967). 6 It is the electronic density at the positron position that determines the lifetime of a positron in an electron gas. Such measurements, in metals, represent a direct check of our theory in this case. 7 J. S. Langer and S. H. Vosko, J. Phys. Chem. Solids 12, 196 (1959). 8 It is perhaps worth mentioning, in passing, that reversing the sign of the results found by these authors so as to get the case of a repulsive impurity again leads to a net negative electron density at the impurity for r s values in the metallic range. 9 For a discussion of the physics underlying the use of the zero-frequency limit J7(q*,0) as an approximation to U(q;v), see also J. P. Carbotte and S. Kahana, Phys. Rev. 139, A213 (1965); 129, 1622 (1963.up to 1°K of two sets of measurements on a chill-cast, homogenized, and quenched goldsilver alloy containing 50 at.% gold. The measurements extended up to 3°K. The open points and line show the fit...

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Precious Metals

Jäger¹

1978

Applied Atomic Spectroscopy

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The effect of halide carriers in the spectrographic examination of trace impurities in copper

Cited by 20 publications

References 3 publications

Determination of trace elements in high-purity copper by ETV-ICP OES using halocarbons as chemical modifiers

Determination of trace elements in high-purity copper by ETV-ICP OES using halocarbons as chemical modifiers

Nuclear Specific Heat of Gold-Silver Alloys

Precious Metals

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