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002M solution of sodium thiosulphate using 1ml of 1% starch solution as indicator (the indicator was prepared by dissolving 1 g of soluble starch powder in enough cold water to form a thin paste and adding 100ml of boiling water and boil with stirring).
Potassium permanganate, sodium thiosulphate, potassium iodide, and starch were also obtained from Sigma.
The excess of iodine was titrated against sodium thiosulphate (hypo) solution (0.
The concentrates were leached using sodium thiosulphate and collected on resins for ashing.
Aniline is vacuum distilled over zinc; the middle fraction is collected and stored in a refrigerator, whereas potassium iodate, HI and sodium thiosulphate are used as received.
Estimated mineral recovery, using environmentally-friendly calcium or sodium thiosulphate leaching, is reportedly at least 60 percent, although the Company is confident that this figure can be improved significantly with additional metallurgical research.