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Showing 1 to 13 of 13 for “"Potassium dichromate"”.
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A Study of the Potentiometric Curve Obtained by the Titration of Ferrous Ions with Potassium Dichromate
… for the determination 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
… sulfite, 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 …
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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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Acute dichromate poisoning following the use of toxic purgatives
… of 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 …
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Acute dichromate poisoning following the use of toxic purgatives
… of 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 …
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The effects of heavy metals on the asexual reproduction of the annelid Aeolosoma headleyi Beddard (1888)
… cobalt, 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 …
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The effect of a synthetic soil conditioner and sawdust on vegetable crops
… phosphoric 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 …
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Bioremediation of hexavalent chromium using gram-negative bacteria.
… of P. mirabilis and M. capsulatus (Bath) with potassium dichromate. These changes were consistent with the adsorption of chromium.BLAST searches using known chromate (VI) reducing enzymes from other bacteria showed a presence of four significant potential chromate reductase genes in the genome …
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An investigation into the effect of potential modifiers on the flotation of a copper sulphide ore
… modifiers such as sodium hypochlorite (NaClO), potassium permanganate (KMnO₄) and potassium dichromate (K₂Cr₂O₇) on the flotation of a copper sulphide ore from Kansanshi Copper mine in Zambia. The potential modifiers were investigated at 1x10⁻⁴, 1x10⁻³ and 1x10⁻² mols which gave rise to various …
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Aufwuchs communities of lotic systems: nontaxonomic structure and function
… of sucrose, dextrose, ammonium nitrate, potassium dihydrogen phosphate, and 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 …
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Cultivation of Eimeria Dispersa in Bobwhite Quail Embryos
… in an aqueous solution containing 2.5% potassium dichromate. Oocysts used for rediscription were isolated by sugar flotation and studied with the aid of a compound microscope equipped with achromatic objectives. Oocysts used as a source of inoculum were isolated by sugar flotation, …
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Evaluation of pollution potential and bioremediation of tannery-based chromium wastes in Sub-Saharan Africa: the case of dump sites in Beit Ore Tannery in South Africa and Dogbone Tannery in Kenya
… results of the adsorption study showed that when potassium dichromate solution was used as synthetic Cr (VI) wastewater and treated with donkey dung powder, there was a removal efficiency of 93.3% for Cr (VI). However, when the dung was applied to real tannery chromium effluents from BO and DB, …