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1 de abr. de 1997 · In this paper, the degradation kinetics of xanthate in homogeneous solution as a function of pH at 5°C, 20°C and 40°C is systematically studied by UV-Visible spectrophotometric measurements. The results indicate that the degradation of ethyl xanthate is rapidly increased with decreasing pH at pH < 7. At pH 7–8, the maximum half-life of the ...
Xanthates. II. Xanthates. A. The Carbon Disulfide–Methyl Iodide Procedure (The Standard Procedure for Xanthate Synthesis) The most common method for synthesizing O - [ (alkylthio)thiocarbonyl] esters of carbohydrates (carbohydrate xanthates) begins by forming an alkoxide ion from reaction of sodium hydride with a compound containing ...
1 de sept. de 2021 · Butyl xanthate was used as the target pollutant to characterize the adsorption and photocatalytic properties of obtained materials. 0.06 g of photocatalyst was added into 100 mL of butyl xanthate solution with 100 mg/L concentration. The mixture of catalyst and solution was sonicated for 5 min to ensure uniform mixing.
1 de ene. de 2019 · Determination of xanthate sulphur and byproducts by UV spectroscopy. A stock solution of 100 ml was prepared by diluting 1 g viscose dope sample with 1% NaOH solution. Known amount of sample (5 ml) was withdrawn from stock solution and diluted to 250 ml with distilled water for UV spectrophotometric measurements.
3 de feb. de 2022 · Ethyl xanthate solutions were prepared from solid potassium ethyl xanthate (≥97.0%; Alfa Aesar, Kandel, Germany) and stored in a refrigerator. A stock solution of 1000 mg L −1 KEX was prepared from the solid and working solutions were prepared from the stock.
1 de abr. de 2024 · Therefore, sulfidization-xanthate flotation as well as used to treated zinc oxide ore, zinc-sulfur species surface was formed by Na 2 S react with the smithsonite surface, even added to metal ions (Pb 2+ and Cu 2+) to activate or enhancement sulfidization of mineral surface before and after Na 2 S treatment, which are able to promoted the xanthate collector adsorb on the mineral surface and ...
Xanthates produce carbon disulfide in an aqueous solution through dissociation and through hydrolysis. Dissociation is more important in acidic media, while hydrolysis prevails in alkaline solutions, and is the main reaction pathway in mining processes (Commonwealth of Australia, 1995).Information on the toxicity of xanthates is very limited, and the main health concern in xanthate exposure ...
