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Showing 1 to 20 of 28 for “"dichromate"”.
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Acute dichromate poisoning following the use of toxic purgatives
… which revealed a high concentration of potassium dichromate. Subsequently elevated levels of chromium were demonstrated by atomic absorption spectrometry in the blood and urine of this patient. Following this case there have been six further cases of acute renal failure resulting from use of …
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Acute dichromate poisoning following the use of toxic purgatives
… which revealed a high concentration of potassium dichromate. Subsequently elevated levels of chromium were demonstrated by atomic absorption spectrometry in the blood and urine of this patient. Following this case there have been six further cases of acute renal failure resulting from use of …
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A Study of the Potentiometric Curve Obtained by the Titration of Ferrous Ions with Potassium Dichromate
… of iron by titration with potassium dichromate. The author in his own words tells why he developed this method and preferred it to other well- known analytical methods.
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Optimization of a Copper/Molybdenum Flotation Circuit by Depressing Pyrite from the Rougher Flotation Stage Using Different Scheme of Reagents
… zinc sulfate, calcium hydroxide and potassium dichromate as pyrite depressants from a literature review and expert suggestions. Of the reagents tested, potassium dichromate was included as a modification to simulate chrome grinding media effect. Some studies have documented that there is a …
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Comparison of Some of the Various Methods of Determination of Iron
… are the: (l) Zimmermann-Reinhardt, (2) dichromate with internal redox indicator, (3) dichromate with internal redox indicator demonstrating the reversability of the reaction by back-titrating with standard ferrous solution, (4) ceric sulfate, (5) reduction with zinc in a Jones reductor …
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Investigation of Chalcopyrite Leaching Kinetics by Alternative Leaching Chemicals
… alternative oxidants, hydrogen peroxide (H2O2), dichromate (Cr2O72-) and nitrate (NO3-) were also tested to study chalcopyrite leaching behavior in the presence of the oxidants in alternative lixiviants.Chalcopyrite leaching tests were conducted to choose the best performing lixiviant among MSA, …
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Manual and Automated Measurement of the Chemical Oxygen Demand (COD) of Wastewaters
… limited. An historical review of tests based on dichromate oxidation shows that many different procedures have been proposed, but that an almost universally accepted procedure now seems to have evolved. Automation of the procedure is shown to be possible but the difficulties in doing so are …
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Aufwuchs communities of lotic systems: nontaxonomic structure and function
… toxicants including copper sulfate, potassium dichromate and chlorine, in order to elicit responses by the aufwuchs communities that accumulated on artificial substrates. The carbon-14 method was adapted and refined using a chamber for measurements of primary productivity in lotic systems. …
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The kinetics of the arsenic(III) - chromium(VI) reaction on acetic acid-acetate buffers
… adduct in which either the acid chromate or dichromate ion is involved. A second possible mechanism postulates adduct formation involving only the acid chromate ion, followed by a CrO₄= catalyzed decomposition of the adduct. In either suggested mechanism, the acetate and hydroxide ion …
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The effects of heavy metals on the asexual reproduction of the annelid Aeolosoma headleyi Beddard (1888)
… and nickel. Additionally, chromium, as potassium dichromate, was tested. Of these metals, only two, zinc chloride and copper sulfate, significantly stimulated reproduction at or below 0.01 ppm of the metal. All metals inhibited reproduction at high concentrations and none, except the two above, …
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Xenobiotic metabolism and markers of genotoxicity in regulatory non-vertebrate ecotoxicological test species
… Following exposure to a mixture of sodium dichromate and benzo[a]pyrene, a greater number of DNA repair genes showed up-regulation in adults compared to neonates. The majority of modulated genes implicated sodium dichromate as the primary stressor (e.g. glutathione-S-transferases, …
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Synthesis of Protected Amino Alcohols and Amino Aldehydes.
… Oxidation of the amino alcohols with pyridinium dichromate gave the amino aldehydes in high yields. The amino alcohols and aldehydes were characterized by NMR, IR, TLC, optical rotation, and derivatization.A total synthesis of antipain was designed, based on the synthetic method developed above. …
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The effect of a synthetic soil conditioner and sawdust on vegetable crops
… acid, or potash in the soil. 3. The potassium dichromate and sulphuric acid tests, used by the Soils Laboratory of this institution, did not indicate that the soil treatments increased the organic matter content of the soil. 4. In general, synthetic soil conditioners as used in this test have …
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Immobilisation of copper, chromium and arsenic on stabilised domestic refuse
… sulphate (copper (II)); chromium is present as dichromate (chromium (VI)); arsenic is present as the pentoxide (arsenic(V)). The laboratory scale investigation focused on the evaluation of kinetic rate constants (adsorption and desorption) and the evaluation of adsorption isotherms. At …
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The preparation of some unsymmetrical ortho substituted ̲o-dibenzoylbenzenes and 1,3-diphenylisobenzofurans
… benzoylbenzophenone (LVII), by the use of sodium dichromate and sulfuric acid, Reduction of these with zinc dust in acetic acid gave the corresponding 1,3-diarylisobenzofurans (III), 1-(2‘-methylpheny1)-3-phenylisobenzofuran (LV) and 1-2" -methoxyphenyl)-3-phenyl isobenzofuran (LVIII). Attempts …
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Nanoscale Enhancement of Photosensitized Radionuclide Stimulated Therapy
… hole flux as well as the ability of adsorbed dichromate to act as an oxygen independent metallo-therapeutic. Finally, we develop a polymer stabilized perfluorocarbon nanoemulsion able to be tracked with near-infrared fluorescent imaging and increase the oxygenation of hypoxic tumor tissue for …
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The chemistry of thujone : new enantioselective syntheses of Ambrox[Registered trade mark] and Epi-Ambrox
… was then oxidized to racemic 143 with sodium dichromate. At this stage, enantiopure 143, obtained via 144, from thujone (1) was prepared and compared with racemic 143. A novel method for the transposition of the carbonyl function in enantiopure 143 to the isomeric enantiopure enone 172 was …
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The Characterization of Glycosaminoglycans and Metallic Dianions in the Gas Phase
… of two multiply charged inorganic anions. The Dichromate dianion Cr2O72- was seen to fragment via electron loss and ionic fragmentation. Density Functional Theory was used to determine that the relative barrier height for electron loss was lower than that for ionic fragmentation. The gas phase …
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