Clarence L. Speyers
1896 Journal of the American Chemical Society  
CLARENCE I,. SPEYERS. nium acetate solution and five cc. acetic acid (thirty per cent.) and digest for half an hour at 70' C., by which time the precipitation is complete. Filter, washing five or six times with hot ammonium acetate solution (ten per cent.), stirring up the precipitate with the jet each time. Ignite with a low flame until the paper is charred, increase the heat, and, when the paper is completely consumed, blast for a minute. The precipitate is the normal aluminum phosphate and
more » ... num phosphate and its weight multiplied by the factor 0.418 gives the A1,0,. The iron oxide is determined volumetrically, preferably by the bichromate method, in a solution of the precipitate of iron oxide and calcium phosphate thrown down by the caustic potash. It is also determined separately, by the same method, in a solution of five grams of the rock in dilute hydrochloric acid ( 1-1 ). My thanks are due to Mr. H. E. Cutts, A.M., for valuable assistance in the above investigation.
doi:10.1021/ja02094a013 fatcat:35z5t2v44zdivplgjupmvp5jxm