Abstract：Tin was a kind of harmful element in iron and steel and its content must be strictly controlled. Therefore, the content of tin in iron ore should be accurately measured. The determination method of tin in iron ore by alkali fusion-iodide extraction-phenylfluorone spectrophotometry was established. The sample was fused with anhydrous sodium carbonate-boric acid (m∶m=3∶1) as mixed flux at high temperature. The molten substance was then leached with hydrochloric acid (1+5). After sulfuric acid fuming and cooling, the sample solution was diluted to certain volume. Appropriate volume of prepared solution was sampled. The potassium iodide was added and benzene was used to extract the iodide, which was then re-extracted with 0.8mol/L sulfuric acid. The water phase was transferred into 50mL volumetric flask. After adding phenylfluorescein and cetyl trimethylammonium bromide for coloring, the absorbance was measured using spectrophotometer at the wavelength of 535nm. The determination range was 0.0005%-0.20%. The spiked recoveries were between 99% and 104%. The proposed method was applied for the determination of tin in iron ore samples. The relative standard deviation (RSD, n=8) of the results was less than 4%.
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TANG Ben-ling, LI Ya-hua. Determination of tin in iron ore by alkali fusion-iodideextraction-phenylfluorone spectrophotometry. , 2019, 39(5): 19-24.
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