COMPOSITION OF LEAD ARSENATES ON THE MARKET. 



RESULTS OF ANALYSES. 



TABLE I. Composition of commercial lead arsenates. 

 ANALYSIS OF ORIGINAL SAMPLE. 



Sample had distinct odor of ammonia; on determination gave 0.14 per cent on original sample. 



6 Sample had decided acid reaction; strong odor of acetic acid. 



cContained 2.48 per cent of CaO, 1.75 per cent of CO; calculated to moisture-free basis, 4.56 per cent of 

 CaO, 3.22 per cent of CO. 



d Mostly lead arsenite. Total arsenic reported as As s O 8 , 43.81 per cent; of this, 3.37 percent (O3.91 

 per cent AsiO 5 ) is present as arsenate; soluble arsenic reported as AsjOs. 



< Sample labeled " lead arsenite; " a mixture of lead arsenite and lead arsenate. Arsenic as arsenite 6.52 

 per cent of AsjC) 3 >7.. r >7 por crnt of AsjOj); as arsenate 10.47 per cent, of AsO 5 . Calculated to moisture- 

 iree basis AsOt 10.01 per cent; AsjO 5 - 16.31 per cent. Water-soluble arsenic reported as AsO|. 



/Contains an excess of lead as carbonate. 



23904 Bull. 13110 2 



