Toxicity of metal-contaminated sediments from Keswick Reservoir, California, USA

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1897/1551-5028(2000)019<0485:TOMCSF>2.3.CO;2· OSTI ID:20075825

Finlayson, B; Fujimura, R; Huang, Z Z

Keswick Reservoir, California, USA, receives metal-laden acid-mine drainage (AMD) from the abandoned Iron Mountain Mine. Mixing of the AMD with reservoir water causes precipitation and deposition of metal-rich sludge in the reservoir. Hydroelectric generation activities can scour the sediments and mobilize trace metals cadmium, copper, and zinc into the water column, thus creating potentially toxic conditions to fish and aquatic invertebrates. Sediment samples collected from Keswick Reservoir in 1993 and 1994 were analyzed for acid-volatile sulfides and for simultaneously extractable metals (SEM), and whole sediments and sediment elutriates were tested for toxicity to rainbow trout (Oncorhynchus mykiss), amphipods (Hyalella azteca), and cladocerans (Ceriodaphnia dubia). Acid-volatile sulfide concentrations in the sediments were low (<10 {micro}mol/g H{sub 2}S), indicating that dissolved metals in the sediment pore water were not limited by sulfide. The SEM concentrations were generally high (up to 11 {micro}g/g Cd, 4,800 {micro}g/g Cu, and 1,600 {micro}g/g Zn, dry weight) in the sediments. Whole sediments and 20% w/w sediment elutriates from 16 sites were tested for toxicity. Low survival (as low as 0{degree}) in whole sediments was generally associated with copper and zinc, and to a lesser extent cadmium, concentrations that exceeded probable effect level values for freshwater sediments; survival also may have been influenced by low pH and alkalinity conditions. Low survival (as low as 0%) in sediment elutriates was also generally associated with higher concentrations of dissolved zinc. Further study is required to formulate sediment cleanup levels that are protective of fish and wildlife. Source control in the Iron Mountain Mine drainage will eventually significantly lessen the production of sediments.

• Research Organization: California Dept. of Fish and Game, Elk Grove, CA (US)
• OSTI ID: 20075825
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 2 Vol. 19; ISSN 0730-7268; ISSN ETOCDK
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID MINE DRAINAGE
AQUATIC ORGANISMS
BIOLOGICAL INDICATORS
CADMIUM
CALIFORNIA
COPPER
ENVIRONMENTAL IMPACTS
SEDIMENTS
TOXICITY
WATER POLLUTION
WATER RESERVOIRS
ZINC