Exponent staff members have technical expertise with a wide variety of metals and metalloids.
Beryllium – Exponent staff examined beryllium sensitization, chronic beryllium disease, and workplace exposure at mining and extraction facilities and have provided industrial hygiene, epidemiology, and medical review to occupational beryllium exposure control plans for industry.
Arsenic – In addition to performing risk assessments to evaluate arsenic in soil, groundwater, surface water, and fish, Exponent has extensive experience with utilizing bioavailability adjustments for arsenic
. Exponent has also conducted market-basket surveys of inorganic arsenic to evaluate exposure in the diet and to provide points of comparison to other environmental exposures, as well as assessment of EPA arsenic toxicity values.
Chromium – Exponent staff has published over 20 manuscripts regarding exposure and the potential health risks of chromium in the peer-reviewed scientific literature Several of these research projects are now the bases for the U.S. Environmental Protection Agency’s reference concentration (RfC) for hexavalent chromium, the New Jersey soil standards protective of allergic contact dermatitis (ACD) due to dermal contact with soil, the cancer risk assessment used as the basis for the 2006 Occupational Safety and Health Administration Permissible Exposure Limit for hexavalent chromium, and the 2007 EPA risk assessment for hexavalent chromium on treated wood.
Lead – In addition to conducting risk assessment to evaluate lead in air, groundwater, soil and surface water, Exponent has conducted numerous evaluations of lead in consumer products such as toys, jewelry, keys, electrical products, ceramics, and cookware. Exponent staff has provided toxicology and risk assessment support for blood lead monitoring evaluations and have evaluated contributions of various environmental sources to blood lead levels in children.
Mercury – Exponent staff has performed numerous assessments evaluating sediment, soil, and water, and bioaccumulation of mercury in fish, as well as determining oral bioavailability from soil. Exponent has also assessed exposure to mercury vapors from gas regulators, during ore processing, and at chlor-alkali plants. Exponent toxicologists also have evaluated mercury doses from food and vaccine sources.