Soil geochemistry and digestive solubilization control mercury bioaccumulation in the earthworm Pheretima guillemi

Journal of Hazardous Materials
Fei DangDongmei Zhou

Abstract

Mercury presents a potential risk to soil organisms, yet our understanding of mercury bioaccumulation in soil dwelling organisms is limited. The influence of soil geochemistry and digestive processes on both methylmercury (MeHg) and total mercury (THg) bioavailability to earthworms (Pheretima guillemi) was evaluated in this study. Earthworms were exposed to six mercury-contaminated soils with geochemically contrasting properties for 36 days, and digestive fluid was concurrently collected to solubilize soil-associated mercury. Bioaccumulation factors were 7.5-31.0 and 0.2-0.6 for MeHg and THg, respectively, and MeHg accounted for 17-58% of THg in earthworm. THg and MeHg measured in soils and earthworms were negatively associated with soil total organic carbon (TOC). Earthworm THg and MeHg also increased with increasing soil pH. The proportion of MeHg and THg released into the digestive fluid (digestive solubilizable mercury, DSM) was 8.3-18.1% and 0.4-1.3%, respectively. The greater solubilization of MeHg by digestive fluid than CaCl2, together with a biokinetic model-based estimate of dietary MeHg uptake, indicated the importance of soil ingestion for MeHg bioaccumulation in earthworms.

References

May 16, 2001·Environmental Science & Technology·S S QianR S Teed
Jan 14, 2003·Environmental Science & Technology·Joy J Leaner, Robert P Mason
Feb 19, 2005·Environmental Geochemistry and Health·Mark C Gabriel, Derek G Williamson
Apr 25, 2006·Environmental Toxicology and Chemistry·Gerald J ZaguryLouise Deschênes
Jul 13, 2006·Environmental Science & Technology·Huan Zhong, Wen-Xiong Wang
Oct 21, 2006·Environmental Science & Technology·Huan Zhong, Wen-Xiong Wang
Apr 19, 2008·Science·Daniel A CristolAriel E White
May 31, 2011·Environmental Pollution·Stephan R RiederBeat Frey
Aug 21, 2012·Environmental Toxicology and Chemistry·William H ClementsKaren A Kidd
Jan 9, 2013·Environmental Toxicology and Chemistry·N Roxanna RazaviPeter V Hodson
Jul 22, 2014·Environmental Pollution·Masoud M ArdestaniCornelis A M van Gestel

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Citations

Oct 23, 2016·Environmental Science and Pollution Research International·Khandaker Rayhan MahbubMallavarapu Megharaj
Jan 20, 2018·International Journal of Analytical Chemistry·Lakshmi Narayana Suvarapu, Sung-Ok Baek

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