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TOTAL AND BIOAVAILABLE METALS AT MARINA SEDIMENTS IN LAKE TEXOMA
An, Y. AND D H. Kampbell*. TOTAL AND BIOAVAILABLE METALS AT MARINA SEDIMENTS IN LAKE TEXOMA. Presented at 13th Annual SETAC Europe Meeting, Hamburg, GERMANY, April 27 - May 01, 2003.
To inform the public.
Total and bioavailable metals in sediments were measured at marina areas in Lake Texoma during the fall of 2001. The metals most often found in the highest concentrations in sediments were Ca (56811 mg/kg) and Al (31095 mg/kg), followed by Fe (19393 mg/kg), K (6089 mg/kg), and Mg (5128 mg/kg). Copper concentration in the sediment samples analyzed ranged from 9 to 136 mg/kg. Elevated Cu level at specific locations appeared to be associated with local anthropogenic sources of boat repair activities. Five heavy metals (As, Cd, Cr, Cu and Zn) in marina sediments were extracted with a weak electrolyte solution (0.1 M Ca(NO3)2) to predict the bioavailability of metals since bioavailability is related to the solubility of exchangeable metals. The order of the extractable metal concentration rankings was not the same as the order of the total metal concentration rankings. Among the five heavy metals that are toxic to many organisms, Cu (0.51 mg/kg) was highest, followed by Zn (0.32 mg/kg), Cr (0.16 mg/kg), As (0.11 mg/kg), and Cd (0.01 mg/kg). Copper was the most bioavailable in Lake Texoma marinas according to the extraction technique used.