i82 Sanitary Stiidies of Baking Pozuders 



When all these precautions are observed the phosphate methods, 

 as outlined in this paper, may be relied upon to yield accurate results 

 for aluminum, both in aqueous sol. and when derived from organic 

 matter, even when only a few milligrams of aluminum are present 

 in the sample analyzed. 



The Schmidt and Hoagland method yields equally accurate re- 

 sults and has the advantage over the other methods of being simpler. 



IV. Conclusions. i, The method used by Steel in his work on 

 the "Absorption of aluminum from aluminized food" yields accu- 

 rate results for aluminum when care is taken in the technique. 



2. The method proposed by the U. S. Government Committee 

 on Research and Analytical Methods is very similar to the method 

 used by Steel. This method yields accurate results for aluminum, 

 both in aqueous sol. and in the presence of large amounts of organic 

 matter. 



3. The Schmidt and Hoagland method is as accurate as the 

 other two methods, and has the advantage over them of involving 

 fewer manipulations. 



BIBLIOGRAPHY 



1. Steel: Amer. Jour. PhysioL, 191 1, xxviii, p. 94. 



2. U. S. Dept. Agr., Bur. Chem., Bull. 107, 1908, p. 177. 



3. Zimmerman-Rheinhardt: Jour. Amer. Chem. Soc, 1895, ^vii, 



P. 405.. 



4. Kahn: Biochem. Bull., 191 i, i, p. 235. 



5. Steel : Loc. cit. 



6. Schmidt and Hoagland: Jour. Biol. Chem., 1912, xi, p. 387. 



7. U. S. Bur. Standards, Cir. 40, 1912. (Republished in the Jour. 



Amer. Chem. Soc., 191 2, xxxiv, p. 393.) 



8. Mixer and DuBois : Modification of the Zimmerman-Rheinhardt 



method: Jour. Amer. Chem. Soc, 1895, xvii, p. 405. 



9. Jones and Jeffrey: Analyst, 1909, xxxiv, p. 306. 



10. Jones and Jeffrey : Ihid. 



11. Mixer and DuBois: Loc. cit. 



12. U. S. Dept. Agr., Com. on Research and Analytical Methods : 



Jour. Jnd. and Chem. Eng., 191 5, vii, p. 446. 



13. Steel: Loc. cit. (i). 



14. Jones and Jeffrey: Loc. cit. (9). 



15. Mixer and DuBois: Loc. cit. (11). 



16. Steel: Loc. cit. (i). 



17. Steel: Ihid. (i). 



