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Eschka method (для определения содержания серы в нефтепродуктах: he reagent is called Eschka mixture and is composed by MgO/ Na 2 CO 3 in 2:1 ratio. When the sample is heated in the electrical furnace inside the Eschka mixture sulphur is converted into SO 2 and SO 3 but reacts immediately with MgO forming MgSO 4 and MgSO 3 . ...  wikipedia.org) | |||