SANITARY STUDIES OF BAKING POWDERS 



3. A study of the methods for the quantitative determination 



of aluminum in blood 



L. J. CURTMAN and P. GROSS 



(Laboratory of Analytical Chetnistry, College of the City of New York) 



(Received for publication, November i, 1915) 



The object of this investigation was a comparative study of the 

 best of the available methods for the quantitative determination of 

 aluminum in biological material. To this end it was desirable first 

 to experiment with known mixtures of Standard Solutions of alu- 

 minum and iron. 



Preparation and standardization of sors. Aluminum sol. 

 Sixty-two gm. of Al2(S04)3-i8H20 (Kahlbaum) were dissolved in 

 5 1. of dist. water containing 50 cc. of H2SO4 (1:1). This gave a 

 sol. with an aluminum value of approximately i cc. = i mg. The 

 sol. was then standardized ; the results are given in Table i. 



I. In Det'ns i, 2, 3 (Table i), definite volumes of the sol. were 

 evaporated to dryness in a weighed platinum dish, heated in an oven, 



I6S 



