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  • Chemistry  (7)
  • solubilization  (2)
  • 25.85.Ec  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Studies on mobilization of chromium with reference to its plant availability – Role of organic acids (1999)
    Springer
    BioMetals 12 (1999), S. 201-207 
    Details
    ISSN: 1572-8773
    Keywords: organic acids ; complexation ; CrIII ; solubilization ; maize plant ; chromium enrichment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Metal-organic acid interactions with special reference to their plant availability have been studied. The role of organic acids in the mobilization of Cr by converting it into labile organically bound form, enhancing its availability, is highlighted. Pot experiments are conducted to investigate the effect of various organic acids on the uptake and translocation of root absorbed trivalent and hexavalent chromium by maize (z. mays) plants grown in sand and soil culture. Statistically significant increases in chromium accumulation from CrIII-treated plants in the presence of increasing concentrations of organic acid suggest the existence of CrIII – organic acid interactions in the soil plant system. In order to support the above mentioned hypothesis of formation of organically bound CrIII in the presence of various organic acids (carboxylic and amino acids), separate experiments have been performed to synthesize and estimate its respective organically bound forms. Amendments with organic acids, however, do not appear to markedly affect chromium accumulation from CrVI treatment. The results are discussed on the basis of the potential of organic acids to form complexes with CrIII.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009262609373
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  • 2
    Electronic Resource
    Electronic Resource
    Chromium mobilization and plant availability — the impact of organic complexing ligands (1999)
    Springer
    Plant and soil 212 (1999), S. 201-206 
    Details
    ISSN: 1573-5036
    Keywords: complexation ; CrIII ; organic acids ; root exudates ; solubilization ; tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Pot experiments were conducted to investigate the effect of various organic acids (carboxylic and amino acids) on the uptake and translocation of root-absorbed trivalent chromium by tomato ( Lycopersicum esculentum) plants grown in sand and soil culture. Statistically significant increases in chromium accumulation from Cr(III) treated plants in the presence of increasing concentrations of organic acid suggest the existence of Cr(III) — organic acid interactions in the soil-plant system. However, the amino acids have been less effective in the mobilization of chromium compared to carboxylic acids. The results are discussed on the basis of the potential of organic acids to form complexes with Cr(III).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004691217480
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetik der Sol-Gel-Umwandlung. I. Beziehung zwischen Konzentration des koaglierenden Elektrolyten und der Erstarrungszeit der Gallerte (1932)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 208 (1932), S. 163-168 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es ist gezeigt worden, daß die Gleichung von PAINE, die ursprünglich für die Ausflockung von Solen aufgestellt war, auch auf die Erstarrung von Gallerten anwendbar ist. Bedeutet S den reziproken Wert der Erstarrungszeit einer Gallerte bei einer Elektrolytkonzentration c, dann gilt S = R cp, wo R eine Konstante und p den Stoßfaktor bedeuten. Die Versuche mit Ferriarsenat, Zirkoniumhydroxyd, Ceriliydroxyd und positivem oder negativem Chromiarsenat lassen ausgezeichnete Übereinstimmung zwischen den berechneten und gefundenen Werten von log S erkennen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19322080207
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  • 4
    Electronic Resource
    Electronic Resource
    Fragment angular momenta in low and medium energy fission of242Pu (1987)
    Springer
    The European physical journal 327 (1987), S. 225-229 
    Details
    ISSN: 1434-601X
    Keywords: 25.85.Ge ; 25.85.Ec
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Independent isomeric yield ratios of128Sb were determined radiochemically in the thermal neutron induced fission of241Pu and 34 MeV alpha particle induced fission of238U, both involving the same compound nucleus (242Pu). Fragment angular momenta estimated from the measured isomer ratios using the statistical model analysis showed significantly larger fragment angular momenta in the medium energy fissioning system compared to the low energy fissioning system. This has been attributed to the effect of higher excitation energy and angular momentum in the entrance channel leading to increased fragment temperature, moments of inertia and angular velocity. An attempt was made to calculate the fragment angular momentum in the medium energy fission using the Fermi gas model for the fissioning nucleus, taking into account the multichance fission, saddle shapes of the fissioning nuclei and the angular velocity components of the fissioning nuclei both along and orthogonal to the fission axis. The calculated angular momenta agree well with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292412
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetische Untersuchungen an unlöslichen amorphen Stoffen. I. Magnetische Suszeptibilität verschiedener Eisensalze (1934)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 217 (1934), S. 27-32 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wurden die magnetischen Suszeptibilitäten verschiedener Arten des Arsenats, Phosphats, Molybdats, Borats, Wolframats, Oxalats und Benzoats von Eisen gemessen, um den amorphen Zustand dieser Stoffe näher kennenzulernen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19342170105
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  • 6
    Electronic Resource
    Electronic Resource
    Herstellung und Eigenschaften von Gallerten der Zirkonsulfosalicylsäure (1933)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 215 (1933), S. 249-254 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19332150304
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  • 7
    Electronic Resource
    Electronic Resource
    Einfluß verschiedener Stoffe auf die Peptisation von Ferriarsenat, -phosphat, -wolframat und -molybdat durch Ferrichlorid (1932)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 205 (1932), S. 241-250 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Niederschläge von Ferriarsenat, -phosphat, -wolframat und-molybdat werden in merklichem Umfang durch Ferrichlorid peptisiert, wobei positiv geladene Sole dieser Stoffe erhalten werden.
    Additional Material: 17 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19322050305
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  • 8
    Electronic Resource
    Electronic Resource
    Einfluß organischer Stoffe auf die Bildung der Gallerten des Arsenats, Phosphats und Molybdats von Thorium (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 201 (1931), S. 301-313 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Einfluß organischer Stoffe wie Glycerin, Glykokoll, Harnstoff und Rohrzucker auf die Erstarrung der Gallerten von Thoriumarsenat, -phosphat und -molybdat ist untersucht worden.
    Additional Material: 14 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19312010127
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  • 9
    Electronic Resource
    Electronic Resource
    Über das Zersetzungsprodukt des blauen Chromperoxyds (1954)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 275 (1954), S. 94-97 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Ergebnis spektrophotometrischer Untersuchungen zeigt, daß das Zersetzungsprodukt des blauen Chromperoxyds weder Chromsäure sein kann, wie Barreswil annahm, noch Chrom(III)-chromat nach der Annahme Moissans. Die Analysenergebnisse zeigen, daß das Zersetzungsprodukt sehr wahrscheinlich Chrom(III)-dichromat Cr2(Cr2O7)3 ist. Bei der Zersetzung dieses Chrom(III)-dichromats zu Chrom(III)-oxyd betrug das Verhältnis von Chrom(III)-dichromat zu Chrom(III)-oxyd 1,22 bis 1,26 gegenüber einem theoretischen Wert von 1,23.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19542750109
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetics and Mechanism of Sonochemical decomposition of aqueous bromoform solution (1964)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 26 (1964), S. 140-146 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ultrasonic waves obtained from MULLARD's high frequency ultrasonic generator type E-7562 with a barium titanate transducer having a frequency of I Mc./sec. were employed to study the sonochemical decomposition of aqueous bromoform solution. At constant R. F. output (about 1.7 Kv) to the crystal, the reaction was found to obey the Zero-order kinetics with average velocity constants in standard unit as follows: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm K}_{\rm 8} \left({{\rm Br}_{\rm 2},{\rm Br}^ - } \right) = 8.211 \cdot 10^{ - 5} {\rm gm}{\rm .eq}{\rm .lit}{\rm .}^{ - 1} {\rm min}{\rm .}^{ - 1} } \hfill \\[6pt] {{\rm K}_{\rm 8} \left({{\rm Br}_{\rm 2} } \right)\;\; = 4.182 \cdot 10^{ - 5} {\rm gm}{\rm .eq}{\rm .lit}{\rm .}^{ - 1} {\rm min}{\rm .}^{ - 1} } \hfill \\\end{array} $$\end{document} Effects of bulk and ultrasonic intensity have also been demonstrated. The rate of reaction at different dilutions of aqueous bromoform solution and also at different intensities has been investigated conductometrically. A probable mechanism of the reaction was also presented.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19640260306
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