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A stationary phase for thin-layer chromatography has been prepared by bonding purified diatomaceous earth (rich in silica) with γ-aminopropyltrimethoxysilane. The phase has been characterized by elemental analysis, measurement of the specific surface area, IR spectroscopy, thermal analysis, and chromatographic testing.

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. Arnaud , L. , Huong , T.T.L. , Yves , B. , Eric , H. 2005 . Efficacy of diatomaceous earth formulations admixed with grain against populations of Tribolium castaneum . J. Stored Prod. Res. 41 : 121 – 130

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Akbar W., Lord J. C., Nechols J. R. and Howard R. W. (2004): Diatomaceous earth increases the efficacy of Beauveria bassiana against Tribolium castaneum larvae and increases conidia attachment. J. Econ. Entomol. 97, 273

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amorphous silica dust, Dryacide against Rhizopertha dominica (F.) . J. Stored Products Research 29 , 271 – 275 . Arnaud , L. , Lan , H. T. T. , Brostaux , Y. and Haubruge , E. ( 2005 ): Efficacy of diatomaceous earth formulations admixed

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Akbar, W., Lord, J. C., Nechols, J. R. and Howard, R. W. (2004): Diatomaceous earth increases the efficacy of Beauveria bassiana against Tribolium castaneum larvae and increases conidia attachment. J. Econ. Entomol. 97, 273

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JPC - Journal of Planar Chromatography - Modern TLC
Authors: Olivia Măruţoiu, Cristian Tigae, Constantin Măruţoiu, Irina Kacso, Ioan Bratu, and Ioana Perhaiţa

288 290 S. Ergül , Modification of Diatomaceous Earth and Thin Layer Chromatographic applications. PhD Thesis. University of Balikesir, Balikesir, Turkey, 2003

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Abstract  

Reference materials for the speciation and quantification of chromium in contaminated soils were prepared by impregnating diatomaceous earth with BaCrO4 and Cr2O3. The chronium concentrations of these materials were confirmed to be 200 mg/kg both by atomic absorption spectrometry and by instrumental neutron activation analysis, but monthly assays over two calendar quarters of the reference material impregnated with BaCrO4 revealed the hexavalent chromium was not stable in this matrix.

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Abstract  

The Inorganic Elemental Analysis Group of LANL has prepared several different sets of working reference materials (WRMs). These WRMs are prepared by blending quantities of nuclear materials (plutonium, americium, and enriched uranium) with diatomaceous earth. The blends are encapsulated in stainless steel cylinders. These WRMs are being measured as blind controls in neutron and gamma based non-destructive assay (NDA) instruments. Radiometric measurements on the blending homogeneity and verification on a set of sixty-three plutonium based WRMs are discussed in this paper.

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Summary  

Traceable non-destructive assay standards containing mixtures of well characterized americium and plutonium oxides were prepared by blending weighed quantities with a diatomaceous earth matrix and encapsulating in welded zirconium cylinders. Am and Pu retained in fabrication process materials (e.g., emptied blend bottles), termed holdup, was quantified by gamma-spectroscopy in order to accurately state the total nuclear material content of the standards. The observed holdup data indicate that the common assumption that Am and Pu holdup behavior is similar does not hold up well in the case of mixed oxides.

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Abstract  

Evidence is obtained to show that the liquidliquid extraction separation of99mTc from99Mo with methyl ethyl ketone, methyl propyl ketone and methyl isobutyl ketone can be transformed into a solid-phase column extraction procedure. The aqueous alkaline99molybdate solution is immobilized on a column of a granular large-pore diatomaceous earch support, which is the neluted with the abovementioned extractants. Rapid and clean separation of99mTc can be with all three solvents. The99mTc can be back-extracted from the organic phase on a column filled with distilled water /or saline/ loaded granular diatomaceous earth /Extrelut®/. The possibility of using the abovementioned procedure as a basis for a new99mTc/99Mo generator concept is envisaged.

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