

| )<10ppmldry weight! 



I~ll0-15ppn1 

 j >15ppm 



I 



I 40°20'-l 



4010 



7350' 



7340' 



Figure 9. — Average concentrations of nickel in New York Bight apex sediments. 



Figure 10.— Average concentrations of lead in New York Bight apex sediments. 



Sources of oxygen-consuming organic matter in the New York 

 Bight have been analyzed by Segar and Berberian (1976). They 

 reported that locally produced carbon from phytoplankton 

 accounted for most of the oxygen demand in the apex, especially in 

 summer. Sewage sludge and river-borne organic materials were 

 generally of equal importance. The major contaminants of the New 

 York Bight originate from the highly populated New York metro- 

 politan area and the Hudson River drainage basin. Sources include 

 offshore barged discharges from sewage treatment plants, indus- 

 trial outfalls, and storm water runoff and overflows. 



Hatcher and Keister ( 1976) analyzed organic matter in the New 

 York Bight sediments using the ratio of total carbohydrates (TCH) 

 to total organic carbon (TOO. TCH:TOC ratios were =40 in the 

 sewage sludge disposal site and 50 or more in the axis of the Hud- 

 son Shelf Channel. High TCH:TOC values (>30) may be attrib- 

 uted to sewage-derived organic material in sediment deposits. 



Figure 6 gives a detailed representation of the percentage of total 

 digestible organic material in apex sediments based on our data 

 from five seasonal cruises. 



Figure 1 1 .—Average concentrations of zinc in New York Bight apex sediments. 



