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South Dakota has six lakes and impoundments that exceed mercury fish tissue advisory limits of 1.0 mg kg−1 for consumption. According to the Environmental Protection Agency (EPA), United States fish consumption limits should be at a much lower 0.3 mg kg−1. This study determined water quality parameters that are capable of predicting whether water bodies will have mercury fish tissue concentrations exceeding EPA's threshold fish consumption advisory limit of 0.3 mg kg−1 mercury by statistically comparing mercury fish tissue concentrations to water quality parameters. Phosphorus, alkalinity, pH, DOC, and sulfur have been shown through past studies to influence mercury fish tissue concentration. These water quality parameters, as well as others were collected from the South Dakota Department of Environmental and Natural Resources. (SD DENR). Mercury fish tissue data were collected by the South Dakota Game Fish and Parks (SD GFP). Statistical analyses employed included linear regression, boxplots, binary logistic regression, Akaike's Information Criterion, and stepwise logistic regression. Significant water quality parameters predicting increased mercury concentrations of northern pike in impoundments were phosphorus and pH. For northern pike in natural lakes for this study concluded that alkalinity was the most significant water quality parameter predicting increased mercury concentrations. Mercury concentrations in walleye in natural lakes were influenced by pH and alkalinity.
This project examined the development of ambient water quality criteria (AWQC) for the protection of wildlife for mercury. Mercury is considered a serious risk to wildlife in many areas. As a result, the Great Lakes Water Quality Initiative and others have developed AWQC. These AWQC have been controversial, however, because (1) the AWQC were single values that did not account for site-specific conditions; (2) derivation of the AWQC relied on a single NOAEL, and (3) the AWQC had an unknown level of conservatism because of reliance on both average and conservative assumptions and uncertainty factors. Rather than develop a single value AWQC for total mercury, we derive an AWQC model that explicitly incorporates factors controlling bioavailability, methylation rates and bioaccumulation in the aquatic environment (e.g., pH, DOC, sulfate). To derive our AWQC model, field data was collected including numerous water quality parameters and total mercury and methylmercury concentrations in whole body fish tissue from 31 lakes in Ontario and an additional 10 lakes in Nova Scotia. An independent dataset consisting of 51 water bodies in the United States was then used to confirm the validity and robustness of the AWQC model. Next we combined the results of chronic-feeding studies with similar protocols and endpoints, in a meta-analysis to derive a dose-response curve for mink exposed to mercury in the diet. Using this approach, one can derive an LD5 or other similar endpoint that can then be used as the basis for deriving -wildlife AWQC. In the final step, we used a probabilistic risk model to estimate the concentrations of methylmercury in water that would lead to levels in fish sufficient for there to be a 10% probability of exceeding the mink LD5. This analysis was repeated for various combinations of pH and DOC. The result is an AWQC model for mercury for the protection of wildlife that can be used for a variety of site-specific conditions. This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below
Sediment cores were collected from ten lakes and impoundments in South Dakota to determine the extent of sediment mercury (Hg) contamination and to study the factors that could influence the biogeochemical methylmercury production. The cores were analyzed for total Hg and associated trace metals, loss of ignition, and sulfate. Results show the Hg fish tissue advisory lakes (mean Hg fish tissue> 1 mg/kg) had higher Hg, higher organic matter, and lower total sulfur compared to the Hg fish tissue non-advisory lakes (mean Hg fish tissue
Beginning with vol. 9, only new and continuing but modified projects are listed. Vols. 8- should be kept as a record of continuing but unchanged projects.
Report on how mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury bioaccum. Sampled settings include stream basins that were agr¿l, urbanized, undeveloped, and mined. Predator fish were targeted for collection, and composited samples of fish were analyzed for total Hg (THg), as most of the Hg found in fish tissue is MeHg. Samples of bed sediment and stream water were analyzed for THg, MeHg, and characteristics thought to affect Hg methylation, such as loss-on-ignition and acid-volatile sulfide in bed sediment, and pH, dissolved organic carbon, and dissolved sulfate in water. Illus.
The methylmercury criterion adopted as a water-quality standard in the State of Idaho is a concentration in fish tissue rather than a concentration in water. A plan for monitoring mercury in fish tissue and water was developed to evaluate whether fish in the Boise River, Idaho, upstream and downstream of wastewater-treatment plant discharges, meet the methylmercury water-quality criterion. Monitoring also will be conducted at sites on the Snake River, upstream and downstream of the confluence with the Boise River, and in Brownlee Reservoir, which lies along the border between Idaho and Oregon. Descriptions of standard procedures for collecting and processing samples and qualityassurance steps are included. This monitoring plan is intended to provide a framework for cooperative methylmercury sampling in the lower Boise River basin.