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WHEN Einc must be estimated in potable waters, several litres should be evaporated in order to get weighable quantities of e i m To save the trouble of evaporating the author uses the following method, with great succesB, in the absence of iron :-2.6 grams of potassium ferrocyanide are dissolved in water, and then made up to 100 C.C. ; 3.536 of zinc sulphate are dissolved in water, and made up to one litre. 1 c.c+ of this solution, therefore, contains a 0 1 of aim oxide. TWO glass cylinders, ofdoi:10.1039/an879040051b fatcat:4d6qdjfvmvemvix4qo7sg6f76e