Solubility of Lead Salts in Human Gastric Juice. 189 



119 (815) 



The solubility of certain lead salts in human gastric juice, and its 

 bearing on the hygiene of the lead industries. 



By A. J. Carlson and A. Woelfel. 



[From the Hull Physiological Laboratory, University of Chicago.] 

 1. Solubility of White Leads in Human Gastric Juice. 



White Lead Paint Dusts. 



Solubility in pure gastric juice (25 c.c. G.J. to o. j gr. lead) : 



Basic lead carbonate paint dust 46 per cent. 



Basic lead sulphate paint dust 5.7 per cent. 



Solubility in gastric juice + peptone (25 c.c. G.J., 0.1 gr. peptone, 0.5 gr. lead): 



Basic lead carbonate paint dust 46 per cent. 



Basic lead sulphate paint dust 7.3 per cent. 



Solubility in gastric juice -\-milk {G.J. l-milk 1): 



Basic lead carbonate paint dust none =0 per cent. 



Basic lead sulphate paint dust none =0 per cent. 



Solubility in 0.5 per cent. HCl {25 c.c. HCl to 0.5 gr. lead) : 



Basic lead carbonate paint dust 66 per cent. 



Basic lead sulphate paint dust 6.7 per cent. 



Solubility in 0.5 per cent. HCl+milk (HCl l-milk l): 



Basic lead carbonate paint dust none=o per cent. 



Basic lead sulphate paint dust none =0 per cent. 



Solubility 0.5 per cent. HCl+milk (HCl 2-milk 1): 



Basic lead carbonate paint dust 25.4 per cent. 



Basic lead sulphate paint dust 1.5 per cent. 



Solubility in 0.5 per cent. HCl+milk (HCl 4-milk 1): 



Basic lead carbonate paint dust 83.5 per cent. 



Basic lead sulphate paint dust 6.9 per cent. 



White Leads. 



Solubility in pure gastric juice (25 c.c. G.J. to 0.5 gr. lead): 



Lead carbonate ("Old Dutch Process") 53 per cent. 



Basic lead sulphate 25 per cent. 



Solubility in gastric juice + peptone (25 c.c. G.J. to 0.5 gr. lead): 



Lead carbonate ("Old Dutch Process") 57 per cent. 



Basic lead sulphate 27 per cent. 



Solubility in pure gastric juice (50 c.c. G.J. to 0.5 gr. lead): 



Lead carbonate ("Old Dutch Process") 69 per cent. 



Basic lead sulphate 30 per cent. 



Solubility in gastric juice +milk (G.J. 4-milk 1): 



Lead carbonate 90 per cent. 



Basic lead sulphate 34.8 per cent. 



