Hair methylmercury levels of mummies of the Aleutian Islands, Alaska

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Environmental Research

DOI:https://doi.org/10.1016/j.envres.2008.11.004· OSTI ID:21176123

Ponce, Rafael ^[1]; Knecht, Rick ^[2]; Loring, Stephen ^[3]

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1. Toxicology, Amgen WA, 1201 Amgen Court West, Seattle, WA 981119 (United States)
2. Department of Alaska Native and Rural Development, University of Alaska, Fairbanks, 221 E. Northern Lights Boulevard, Suite 213, Anchorage, AK 99508-4143 (United States)
3. Arctic Studies Center, Smithsonian Institution, National Museum of Natural History, P.O. Box 37012, Washington, DC 20013-7012 (United States)

Ancient human hair specimens can shed light on the extent of pre-historic exposures to methylmercury and provide valuable comparison data with current-day exposures, particularly for Indigenous Peoples who continue to rely upon local traditional food resources. Human hair from ancient Aleutian Island Native remains were tested for total and methylmercury (Hg, MeHg) and were radiocarbon dated. The remains were approximately 500 years old (1450 A.D.). For four adults, the mean and median total hair mercury concentration was 5.8 ppm (SD=0.9). In contrast, MeHg concentrations were lower with a mean of 1.2 ppm (SD=1.8) and a median of 0.54 ppm (0.12-3.86). For the five infants, the mean and median MeHg level was 1.2 ppm (SD=1.8) and 0.20 ppm (0.007-4.61), respectively. Segmental analyses showed variations in MeHg concentrations in 1-cm segments, consistent with fluctuations in naturally occurring exposure to mercury through dietary sources. The levels are comparable to or lower than those found in fish and marine mammal-eating populations today who rely far less on subsistence food than pre-historic humans. The findings are, therefore, compatible with increased anthropogenic release of trace metals during the past several centuries.

• OSTI ID: 21176123
• Journal Information: Environmental Research, Journal Name: Environmental Research Journal Issue: 3 Vol. 109; ISSN ENVRAL; ISSN 0013-9351
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
ALASKA
ALEUTIAN ISLANDS
FLUCTUATIONS
FOOD
HAIR
HUMAN POPULATIONS
INFANTS
MERCURY
METHYLMERCURY