Reconnaissance-Level Assessment of Water and Bottom-Sediment Quality, Including Pesticides and Mercury, in Yankton Sioux Tribe Wetlands, Charles Mix County, South Dakota, June-July 2005 Scientific investions rept

摘要

The purpose of this report is to present the results of a reconnaissance-level assessment of water and bottom-sediment quality in Yankton Sioux Tribe wetlands during June July 2005 in Charles Mix County, South Dakota. Specifically, this report presents (1) a summary of sample collection and analytical methods; (2) concentrations of selected constituents for selected wetlands in the study area; and (3) a synopsis of the atrazine and mercury results. Analytical results for water samples include physical properties and pesticide concentrations from 19 wetlands; mercury, major ions, and organic carbon concentrations from 10 wetlands; and concentrations of chlorophyll a and pheophytin a (Supplemental Information section A) and nitrogen and phosphorus (Supplemental Information section B) from 2 wetlands. Analytical results for bottom-sediment samples include mercury concentrations and characteristics from 10 wetlands. The quality of water and bottom sediment in all Yankton Sioux Tribe wetlands cannot be thoroughly characterized with such a limited sampling program. The results may be used to assess the effects of landmanagement practices on the aquatic resources and identify possible water-quality problems that could be the focus of more comprehensive investigations in the future. The study area is about 686 mi2, which includes the