0.160 



0) 

 i~ 0.120 H 



0) 

 Q. 



(/) 



E 



0.080 — 



c 

 o 



TO 



c 



O 



c 

 o 

 O 



0.040 — 



0.000 



As Pb 



B 



Ni 



Cd Se Cr Zn 



Cu 



