Quantitative determination by the Stallwood Air-Jet DC Arc Technigue. 1. trace impurities in titanium dioxide

A method has been developed to permit the quantitative determination of trace metals in polypropylene and other organic materials in which the total ash content ranges from 0.10 per cent to less than 0.001 per cent by weight. A small sample of the material is ashed directly in the electrode. A fixed amount of germanium internal standard solution is added to the electrode and dried Standards are prepared by adding weighed amounts of a plastic dispersion containing known amounts of the elements to be determined to specially prepared electrodes. Using a controlled atmosphere chamber the prepared electrodes are excited with a dc arc in an atmosphere of argon and oxygen and the spectra recorded photographically.

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Controlled-Atmosphere dc Arc for the Quantitative Determination of Rare Earths in Calcium Fluoride

Applied Spectroscopy ◽

10.1366/000370266774386579 ◽

1966 ◽

Vol 20 (6) ◽

pp. 392-394 ◽

Cited By ~ 7

Author(s):

D. L. Nash

Keyword(s):

Quantitative Determination ◽

Rare Earths ◽

Calcium Fluoride ◽

Controlled Atmosphere ◽

Specific Technique ◽

Limits Of Detection ◽

Dc Arc

This paper discusses the investigation of optimum controlled-atmosphere conditions for the analysis of rare earths in calcium fluoride and describes the specific technique evolved for the determination of terbium and holmium. The limits of detection and precision of the method are given.

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A Spectrochemical Method for the Determination of Trace Impurities in Metallurgical Materials

Applied Spectroscopy ◽

10.1366/000370266774386128 ◽

1966 ◽

Vol 20 (3) ◽

pp. 168-171 ◽

Cited By ~ 17

Author(s):

B. E. Balfour ◽

D. Jukes ◽

K. Thornton

Keyword(s):

Trace Impurities ◽

Dc Arc ◽

Single Set

A method is described in which Ag, As, Au, Bi, Cd, Ge, In, Mo, Pb, Sb, Sn, and Tl are simultaneously determined in a variety of metallurgical materials. Preconcentration and separation are achieved by coprecipitation with copper as mixed sulphides, and excitation is by means of the dc arc. Provision is made for the analysis of a wide variety of materials using a single set of synthetic standards.

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The side reactions in the esterification of phthalic anhydride with 2-ethylhexane-1-ol in the presence of organotitanates

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19840253 ◽

1984 ◽

Vol 49 (1) ◽

pp. 253-266 ◽

Cited By ~ 1

Author(s):

Jan Novrocík ◽

Marta Novrocíková ◽

Jiří Norek ◽

Ivan Koruna ◽

Miroslav Ryska

Keyword(s):

Titanium Dioxide ◽

Quantitative Determination ◽

Homogeneous Catalysis ◽

Phthalic Anhydride ◽

Spectral Methods ◽

Side Reactions ◽

Hydrated Titanium Dioxide ◽

Ethylhexyl Phthalate ◽

Hydrated Titanium

Using synthetic, chromatographic and spectral methods, we studied the side reactions accompanying the preparation of di-2-ethylhexyl phthalate from phthalic anhydride and 2-ethyl-hexane-1-ol in the presence of catalytic amounts of tetra-n-butyl titanate.The catalyst proper was titanium(IV) mono-2-ethylhexyl phthalate. The possibility of a simultaneous gas-chromatographic quantitative determination of mono-2-ethylhexyl phthalate, di-2-ethylhexyl phthalate, 2-ethylhexane-1-ol and tetra-n-butyl titanate, reported in the literature, has been refuted. In the esterification catalysed by hydrated titanium dioxide homogeneous catalysis by the formed organotitanate was dominating. The dissolving of hydrated titanium dioxide in the esterification of phthalic anhydride with 2-ethylhexane-1-ol was studied polarographically.

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Determination of trace impurities in titanium dioxide by slurry sampling electrothermal atomic absorption spectrometry

Spectrochimica Acta Part B Atomic Spectroscopy ◽

10.1016/s0584-8547(97)00077-3 ◽

1997 ◽

Vol 52 (12) ◽

pp. 1747-1762 ◽

Cited By ~ 13

Author(s):

Huang Mao Dong ◽

Viliam Krivan ◽

Bernhard Welz ◽

Gerhard Schlemmer

Keyword(s):

Titanium Dioxide ◽

Atomic Absorption Spectrometry ◽

Atomic Absorption ◽

Electrothermal Atomic Absorption Spectrometry ◽

Absorption Spectrometry ◽

Slurry Sampling ◽

Trace Impurities

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Electrodes for Trace Impurity Analysis and Determination of Traces in Gallium

Applied Spectroscopy ◽

10.1366/000370270774372083 ◽

1970 ◽

Vol 24 (1) ◽

pp. 60-67 ◽

Cited By ~ 5

Author(s):

M. S. Wang

Keyword(s):

Signal To Noise Ratio ◽

Sampling Technique ◽

Trace Determination ◽

Trace Impurities ◽

Graphite Electrodes ◽

Impurity Analysis ◽

Gallium Metal ◽

Ultra Trace ◽

Dc Arc

Electrodes of several graphite makers have been evaluated and compared for weight consistency and impurities for the purpose of developing techniques to determine trace impurities in material which can take advantage of preferential volatilization. A technique suitable for pre-arcing graphite electrodes in an argon atmosphere has been developed for minimizing the impurity background in the electrode cup so that ultra-trace determination is possible. The purified and selected electrodes are used in development of a spectrochemical method for determining trace impurities in gallium metal. The technique takes advantage of strong preferential volatilization of the metals in a dc arc with sequential exposures used for improvement of signal-to-noise ratio. A new sampling technique and standardization method are discussed. Special problems related to the analysis of gallium are investigated, and analytical results are shown.

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