Results 251 to 260 of about 1,903,576 (294)

The Effect of Organic Matter and Organic Acid on the Chromium Release in Sediment

Advanced Materials Research, 2014
Effect of organic matter and organic acid on the heavy metals, especially, chromium (Cr) release in the sediment was researched. Glucose and soluble organic starch was used as organic matter, as well, citric acid and ethylene diamine tetraacetic acid (EDTA) were simulated as organic acid.
Hui Liu, Jiu Lan Dai
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Interactions of organic and inorganic chromium species with Ca-polygalacturonate

Biology and Fertility of Soils, 2007
This study investigated the interactions of CrIII and CrVI present as free metal ions or as organic CrIII (Cr-L) with a Ca-polygalacturonate (Ca-PG) network. Ca-PG networks were treated with solutions of chromium (CrIII and CrVI) at different concentrations at three different pH values.
Mimmo T., CAVANI, LUCIANO, Reggiani R., MARZADORI, CLAUDIO, GESSA, CARLO EMANUELE   +4 more
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Metabolism, Intake, and Digestibility of Lambs Supplemented with Organic Chromium

Biological Trace Element Research, 2013
The aim of the present study was to evaluate the metabolism of organic chromium and its effect on digestibility and intake of lambs. Four 4-month-old male lambs, each weighing 28 kg, were used. The animals were kept in metabolic cages for a period of 20 days (15 days of adaptation and 5 days of experimentation), in two experimental phases, with ...
Jose Francisco Xavier, da Rocha, Adelina, Rodrigues Aires, Matheus Augusto, Gonçalves Nunes, Erico Marlon, Moraes Flores, Gilberto Vilmar, Kozloski, Agueda, Castagna de Vargas, Luana, D'Avila Farias, Marcelo, da Silva Cecim, Marta Lizandra, do Rego Leal   +8 more
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A computational study of organic polyradicals stabilized by chromium atoms

Phys. Chem. Chem. Phys., 2012
Density functional theory has been used to investigate the properties of organic high spin molecules. The M05/cc-pVDZ calculations predict a septet ground state for the 2,3,6,7,10,11-hexahydro-1,4,5,8,9,12-hexaoxocoronene-2,3,6,7,10,11-hexayl radical (coronene-6O).
Ka-Un, Lao, Pei-Kang, Tsou, Timm, Lankau, Chin-Hui, Yu   +3 more
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An analysis of chromium, copper, and zinc in organs of a chromate worker

International Archives of Occupational and Environmental Health, 1980
The content of chromium, copper, and zinc and the valency of chromium were measured in organs of a chromate worker who had been exposed to a considerable amount of hexavalent chromium for 30 years and died of maxillary and lung cancer 10 years after his retirement.
K, Hyodo, S, Suzuki, N, Furuya, K, Meshizuka   +3 more
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Chromium content of organs of chromate workers with lung cancer

American Journal of Industrial Medicine, 1987
AbstractThe content of chromium was measured in organs of six chromate workers who had worked in a chromate chemical manufacturing plant, had been exposed to a considerable amount of chromiun for over 10 years, and had died of lung cancer. The chromium in the lungs of workers averaged 51.5 μg/g (range 24.8–210 μg/g), while levels in the lungs of non ...
R, Kishi, T, Tarumi, E, Uchino, H, Miyake   +3 more
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Chromium(III) Compounds with Some Organic Ligands

Russian Journal of Inorganic Chemistry, 2020
The equilibrium acquisition times in chromium(III)‒organic ligand systems were determined under various conditions. Chromium(III) compounds with picolinic acid Cr(C6H4NO2)3 ⋅ H2O, nicotinic acid CrOH(C6H4NO2)2 ⋅ 2H2O, and citric acid CrC6H5O7 ⋅ 3H2O were isolated; their gravimetric and thermogravimetric analyses carried out; and IR spectra measured ...
N. A. Skorik, R. R. Alimova
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Emission spectrochemical determination of chromium in organic acids

Analytica Chimica Acta, 1968
Abstract An emission spectrochemical procedure is described which directly determines the chromium concentration in organic materials in the p.p.m. range. The only preparation of the sample which is necessary is dilution with a graphite matrix which contains the internal standard element and the spectral buffer, lithium carbonate.
A.L. Schalge, B.D. McCarty, R.E. Lewis
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Photocatalytic reduction of chromium and oxidation of organics by polyoxometalates

Applied Catalysis B: Environmental, 2006
Abstract The photocatalytic reduction of Cr(VI) to the less toxic Cr(III) is presented in the presence of the polyoxometalates (POM) PW12O403− or SiW12O404− as photocatalyst and an organic substrate (salicylic acid or propan-2-ol) as electron donor. Cr(VI), as dichromate, is reduced to Cr(III), according to the 6:1 stoichiometry of PW12O404− versus ...
E. Gkika, A. Troupis, A. Hiskia, E. Papaconstantinou   +3 more
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Determination of chromium(VI) in the soil organic fraction

Journal of Analytical Chemistry, 2009
A procedure was developed for determining chromium(VI) in the soil organic fraction; it consisted of three steps: the preparation of a soil solution; the isolation and separation of chromium(VI) and chromium(III); and the determination of chromium(VI).
J. Kalembkiewicz, E. Sočo
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