CHROMIUM 



COPPER 



LEAD 



-I 1 I I I II I 1 1 1 I I M I I I 1 1 I M I I 



1 I I Mill 



SILVER 



+ M 

 IS 



Figure 23. 



-h 4 X 



+ ♦ X 



X SHALE 

 + SAND 



i MARINE PLANTS 

 ▲ SEWAGE SLUDGE 

 I i ' ■ I I I I I 



0.0001 



10 



0.001 



100 

 0.01 



1000 PPM 

 0.1 % 



Median concentration value (indicated by vertical 

 line) range, and limits for 70 percent of samples 

 analyzed (shown by heavy bar) for surficial samples 

 in New York Harbor and New York Bight. (C-continental 

 shelf sediment, 1-inner harbor deposits, M-deposits 

 near "mud" disposal area, S-deposits near sewage 

 sludge disposal area). Typical concentrations are 

 shown for shales, sands, and marine plants (Bowen, 

 1966) and sewage sludges. Question marks indicate 

 the detection limits for the various elements 

 (After Gross, 1970) 



62 



