科研之友
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摘要
A survey of fluvial sediment heavy metal concentrations (HMC) within the Trinity River was conducted to determine HMC distribution patterns and elution potential. HMC peaks associated with large population centers have been observed in Japanese rivers, most often in the downstream coastal areas where cities are concentrated. It was hypothesized that similar peaks would occur in the upper third of the Trinity River Watershed due to the influence of the Dallas/Fort Worth area. Samples were collected at 22 positions along the Trinity River during December of 2005 and analyzed for cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As), mercury (Hg), nickel (Ni), zinc (Zn), and copper (Cu) content. Longitudinal HMC patterns attributable to watershed geology, hydrology, and human activity were present. The Dallas/Fort Worth metroplex was associated with increases in HMC. Regardless of presence, all HMC in Trinity River sediments, except As, were below environmental regulatory values. Elution experiments indicated minimal leaching potential.
- 出版日期2010-8
