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Excerpt from American Chemical Journal, 1884-85, Vol. 6
II. That artificially precipitated phosphate of lime, whether the di-calcic or tri-calcic form, when mixed with sulphate of lime (as is the case in a superphosphate) and exposed to atmospheric condi tions in Shade in Open vessels for several days and dried to a fine powder, is readily and completely soluble in a neutral solution of citrate of ammonia, at the temperature Of 40° C.
III. That artificially precipitated phosphates of iron and alumina, when treated in the same way, become largely insoluble in the citrate of ammonia solution, at the temperature of 40° C.
IV. That a citrate of ammonia solution alone, of all the solvents that have been proposed, is a perfect solvent for all the forms of reverted phosphates (as they exist in superphosphates), while at the same time it does not unduly dissolve the crude or insoluble phos phate present.
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