E 

 u 



I 

 1- 

 a. 

 ill 

 a 



COPPER. ^g/g ash 



50 too 150 200 



10 



20 



30 



40 



50 



60 



70 



80 



90 



100 



_ D 



~l~a 



2 50 



"ft 



D O 

 CD 



QD 

 O D 



o a 



S 



CD 



eg 



OO 



do 

 oo 

 _o 



o 



o 



i 



o 

 o 

 o 



o 

 o 

 o 



8o 



o 

 o 

 o 



o 

 o 

 o 

 o 



L_0 — 



o FR-IIB 

 Q FR-5A 



Figure 26. Concentrations of copper 

 at various depths in the sediment 

 under Spartina patens at Farm Creek 

 Marsh, Connecticut. The increase from 

 30-cm depth to the surface is due to 

 anthropogenic inputs, largely from the 

 atmosphere (McCaffrey 1977). 



MANGANESE. ;jg/q osh 



250 500 750 1000 



1250 



Farm Creek Marsh, 

 rapid increase at the surface is 

 largely due to a remobilization at Mn 

 at depth and its subsequent loss 

 across the sediment-water interface 

 (McCaffrey 1977). 



56 



