Mercury is a toxic element and serves no beneficial physiological function in man; a maximum acceptable concentration of 0.001 mg/L (1 µg/L) in drinking water has therefore been established. Emissions of both elemental or inorganic mercury can occur from coal-fired power plants, burning of municipal and medical waste, and from factories that use mercury. 2 ppb mercury = U.S. EPA limit for drinking water. Mercury is an element and a metal that is found in air, water, and soil. Dust containing these salts can enter the air from mining deposits of ores that contain mercury. Some people who drink water containing inorganic mercury substantially in excess of the maximum contaminant level (MCL) maximum contaminant levelThe highest level of a contaminant that EPA allows in drinking water. 20 ppb mercury = Neurite membrane structure destroyed (Leong et al., Neuroreport 2001; 12: 733-37). Mercury contamination of fish is the primary reason for issuing fish consumption advisories, which exist in every State in the Nation. 25,000 ppb mercury = Concentration of mercury in the Hepatitis B vaccine, administered at birth in the U.S., from 1990-2001. Some have 0.01% Thimerosal, or 50 mcg mercury per 0.5 mL dose, metabolized in the body to ethylmercury. In 1974, Congress passed the Safe Drinking Water Act. The three forms are called elemental (or metallic) mercury, inorganic mercury compounds, and organic mercury compounds. Approximately 39,000 tons of mercury were released to the You can find your annual public drinking water supply report, called a Consumer Confidence Report, by contacting your water company. Does this public drinking water supply violate the standards for mercury? Inorganic mercury salts can be transported in water and occur in soil. Now analyze your personal water test report. Drinking Water Requirements for Lead EPA's Drinking Water Regulations for Lead. Mercury. Mercury (Hg) 7439-97-6 Molybdenum (Mo) 7439-98-7 Nickel (Ni) 7440-02-0 ... for "direct analysis" of drinking water (turbidity <1 NTU), the combined ... the sample is made up to volume, is mixed and centrifuged or allowed to settle overnight prior to analysis. MCLs ensure that drinking water does not pose either a … The presence of mercury in water has become a source of concern because of the finding that organic mercury is bioconcentrated by fish. It exists in three forms that have different properties, usage, and toxicity. Public Drinking Water Testing Requirements Mercury is a regulated chemical for drinking water sources, with monitoring and compliance requirements (Title 22, Section ... flakes, mercury used in sluices allowed greater gold recovery. This law requires EPA to determine the level of contaminants in drinking water at which no adverse health effects are likely to occur with an adequate margin of safety. 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