SUMMARY 



The results summarized here are consistent with the hypotheses of earher 

 workers that metals forming highly insoluble sulfides will be sequestered in 

 anoxic marine sediments. 



Our conclusions reflect results of a limited study on a small number of 

 metals during one or two seasons in a single estuary. The conclusions are thus 

 prehminary, and cannot be extrapolated to other seasons, metals or estuaries. 

 Organic complexing, in particular, may render certain heavy metals far more 

 soluble than would be expected from sulfide solubiHties calculated, considering 

 inorganic ion pairing only. 



ACKNOWLEDGMENTS 



We are grateful to Scott Nixon, Candace Oviatt and colleagues, for their 

 generous cooperation in collecting samples, and for the loan of sampling 

 equipment. We also wish to express our appreciation to Nile Luedtke, who 

 participated extensively in the pore water and benthic fiux determinations, and 

 scuba divers Paul Benoit, George Morrison, Allen Myers and Bob Pavia for their 

 skill and care in obtaining in situ benthic fiux samples. This work was 

 supported by a grant from the Environmental Research Laboratory of the 

 Environmental Protection Agency. 



REFERENCES 



l.Aller, Robert C. 1977. The Influence of Macrobenthos on Chemical 

 Diagensis of Marine Sediments. Ph.D. Thesis, Yale University, 600 pp. 



2. Boyle, Edward G. and John M. Edmond. 1975. Determination of Trace 

 Metals in Aqueous Solution by APDC Chelate Coprecipitation. In: 

 Advances in Chemistry Series, No. 147, Analytical Methods in 

 Oceanography (Thomas R.P. Gibb, Jr., ed.) American Chemical Society, 

 pp. 44-55. 



3. Cline, J.D. 1969. Spectrophotometric Determination of Hydrogen Sulfide 

 in Natural Waters. Limnology and Oceanography 74:454-458. 



4. Elderfield, H. and A. Hepworth. 1975. Diagenesis, Metals and Pollution in 

 Estuaries. Marine Pollution Bulletin 6:85-87. 



5. Goldberg, E.D., W.S. Broecker, M.G. Gross and K.K. Turekian. 1971. 

 Marine Chemistry. In: Radioactivity in the Marine Environment, National 

 Academy of Sciences, pp. 1 37-146. 



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