Method for determining manganese content in carbon-manganese ball through ammonium ferrous sulfate volumetric method
A technology of ammonium ferrous sulfate and volumetric method, which is applied in the direction of chemical analysis by titration method, can solve the problem of low cost of the method, and achieve the effect of simple operation, simple sample composition and easier observation
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[0034] 1. Preparation of carbon-manganese sphere titration sample solution:
[0035] 1) The sample is run off carbon, and the carbon-manganese ball sample is dried at 105-110°C. Weigh 0.3000g of the dried carbon-manganese ball sample into a magnetic boat, and put it in a muffle furnace at 750-850°C when the sample is grayish white , Stir with a measuring spoon, if there is no black inclusion in the sample, it proves that the carbon has run out, put the sample in the triangular flask, and then add about 1g of distilled water to wet the carbon-manganese ball sample;
[0036] 2) Dissolving, first add 20 mL of hydrochloric acid with a volume fraction of 50% to the carbon-manganese sphere sample wetted in step 1), heat until most of the carbon-manganese sphere sample dissolves, then add 5 mL of nitric acid with a concentration of 1.70 g / mL , continue to heat until nearly dry, and then rinse the wall of the triangular flask with water, then add 20mL of phosphoric acid with a concent...
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