Temporal Trends of Chemical Contamination at NS&T Sites

by T. P. O'Connor, NOAA/NOS Office of Ocean Resources, Conservation and Assessment, Silver Spring, United States,
N. Valette-Silver, NOAA/NOS Office of Ocean Resources, Conservation and Assessment, Silver Spring, United States,
C. A. Parker, NOAA/NOS Office of Ocean Resources, Conservation and Assessment, Silver Spring, United States,
S. Dolvin, NOAA/NOS Office of Ocean Resources, Conservation and Assessment, Silver Spring, United States,



Document Type: Proceeding Paper

Part of: Coastal Zone '93

Abstract: Recent temporal trends in concentrations of ten trace elements (Ag, As, Cd, Cr, Cu, Hg, Ni, Pb, Se, and Zn) and of five groups of organic compounds (butyltins, tDDT, tCdande, tPCB, and tPAH) have been estimated on the basis of annual measurements at 142 sites from 1986 through 1991. The most common observation is a lack of trend but, where trends exist, decreases are much more common than increases. Changes in organic contaminants are almost exclusively decreases, reflecting the fact that their uses are nearly all banned. For trace elements the overall tendency is also in the downward direction.

Subject Headings: Trace elements | Pollution | Zinc | Organic compounds | Coastal environment | Environmental issues

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