All sediments associated with the Chester River--including 
sediments from the Tenneco plant, the Campbell plant, and the 
Chestertown sewage treatment plant—contained more tin than sedi¬ 
ment from a site near Tilghman Island and less tin than a site in 
Baltimore Harbor. Spaniard Bar, which suffered an oysterkill, 
did not yield significantly more than Buoy Rock, which did suffer 
such a kill. Thus, it is not possible to attribute the oyster- 
kill in the Chester River solely to pollution by tin, although 
interaction with other stress factors is possible. In addition 
to sediment, water in the Chester River and water entering the 
Chester River from the Tenneco plant, from the Campbell plant, 
and from the Chestertown sewage treatment plant sometimes contain 
significant quantities of tin. 
Significant progress has been made toward developing a method 
for separation and qualitative and quantitative measurement of 
organotin species in environmental samples and in microbial cul¬ 
tures . 
7 
