Aquatic Disposal Field Investigations Duwamish Waterway Disposal Site Puget Sound, Washington. Appendix D. Chemical and Physical Analyses of Water and Sediment in Relation to Disposal of Dredged Material in Elliott Bay. Volume II. September-December 1976.

摘要

This report presents results obtained in a study conducted to evaluate the extent and duration of changes in chemical characteristics of Elliott Bay, Washington, six and nine months after disposal of dredged materials from the Duwamish River. The seawater, sediment, and interstitial water were analyzed for the following chemical parameters: (1) Seawater--Suspended solids, arsenic, manganese, mercury, reactive silicate, inorganic phosphate, nitrate, and ammonia; (2) Sediment--Free and total (acid soluble) sulfide, manganese, chromium, arsenic, mercury, and particle size; and (3) Interstitial water--Arsenic, manganese, reactive silicate, ammonia, and inorganic phosphate. Temporal, depth, and spatial changes in concentrations of chemical variables were evaluated at disposal and reference sites. The results of analyses showed only minimal changes in trace metal concentrations in the water column above the disposal site, but lower Eh and pH values in the sediments than at the reference site. The manganese, inorganic phosphate, and ammonia concentration values were greater in interstitial waters at the disposal site than at the reference site. (Author)