Mercury and methylmercury in riparian soil, sediments, mine-waste calcines, and moss from abandoned Hg mines in east Guizhou province, southwestern China

Abstract Concentrations of total Hg and methylmercury (MMHg) in riparian soil, mine-waste calcine, sediment, and moss samples collected from abandoned Hg mines in Wanshan district, Guizhou province, China, were measured to show regional dispersion of Hg-contamination. High total Hg and MMHg concentrations obtained in riparian soils from mined areas, ranged from 5.1 to 790 mg kg −1 and 0.13 to 15 ng g −1 , respectively. However, total Hg and MMHg concentrations in the soils collected from control sites were significantly lower varying from 0.1 to 1.2 mg kg −1 and 0.10 to 1.6 ng g −1 , respectively. Total Hg and MMHg concentrations in sediments varied from 90 to 930 mg kg −1 and 3.0 to 20 ng g −1 , respectively. Total Hg concentrations in mine-waste calcines were highly elevated ranging from 5.7 to 4400 mg kg −1 , but MMHg concentrations were generally low ranging from 0.17 to 1.1 ng g −1 . Similar to the high Hg concentrations in soil and sediments, moss samples collected from rocks ranged from 1.0 to 95 mg kg −1 in total Hg and from 0.21 to 20 ng g −1 in MMHg. Elevated Hg concentrations in mosses suggest that atmospheric deposition might be an important pathway of Hg to the local terrestrial system. Moreover, the spatial distribution patterns of Hg contamination in the local environment suggest derivation from historic Hg mining sites in the Wanshan area.

[1]  S. A. Abdrashitova,et al.  Mercury in the Aquatic Environment: A Review of Factors Affecting Methylation , 2001 .

[2]  E. A. Henry,et al.  Mercury methylation in aquatic systems affected by acid deposition. , 1991, Environmental pollution.

[3]  E. Steinnes,et al.  Temporal and spatial trends in Hg deposition monitored by moss analysis. , 2003, The Science of the total environment.

[4]  J. Crock,et al.  Mercury methylation at mercury mines in the Humboldt River Basin, Nevada, USA , 2002, Geochemistry: Exploration, Environment, Analysis.

[5]  R. Bargagli,et al.  Mercury, cadmium and lead accumulation in Antarctic mosses growing along nutrient and moisture gradients , 1998, Polar Biology.

[6]  M. Horvat,et al.  Mercury in the soil-plant-deer-predator food chain of a temperate forest in Slovenia. , 2000 .

[7]  James H. Weber,et al.  Review of possible paths for abiotic methylation of mercury(II) in the aquatic environment , 1993 .

[8]  Nigel T. Roulet,et al.  In situ sulphate stimulation of mercury methylation in a boreal peatland: Toward a link between acid rain and methylmercury contamination in remote environments , 1999 .

[9]  A. Flegal,et al.  Mercury contamination from historic mining in water and sediment, Guadalupe River and San Francisco Bay, California , 2002, Geochemistry: Exploration, Environment, Analysis.

[10]  V. A. Bobrov,et al.  Natural Mercury Levels in Geological Enriched and Geological Active Areas: Case Study of Katun River and Lake Teletskoye, Altai (Siberia) , 2003 .

[11]  M. Roulet,et al.  Methylmercury Production and Accumulation in Sediments and Soils of an Amazonian Floodplain – Effect of Seasonal Inundation , 2001 .

[12]  S. Pirc,et al.  Mercury in the Idrijca River sediments as a reflection of mining and smelting activities of the Idrija mercury mine , 1997 .

[13]  P. Theodorakos,et al.  Mercury in vegetation and soils at abandoned mercury mines in southwestern Alaska, USA , 2002, Geochemistry: Exploration, Environment, Analysis.

[14]  J. Rytuba,et al.  Characterization and speciation of mercury-bearing mine wastes using X-ray absorption spectroscopy. , 2000, The Science of the total environment.

[15]  G. Brown,et al.  Geological and anthropogenic factors influencing mercury speciation in mine wastes: an EXAFS spectroscopy study , 2004 .

[16]  D. Krabbenhoft,et al.  Mercury and methylmercury contents in mine-waste calcine, water, and sediment collected from the Palawan Quicksilver Mine, Philippines , 2003 .

[17]  R. Turner,et al.  Distribution, speciation, and transport of mercury in stream-sediment, stream-water, and fish collected near abandoned mercury mines in southwestern Alaska, USA. , 2000, The Science of the total environment.

[18]  M Horvat,et al.  An improved speciation method for mercury by GC/CVAFS after aqueous phase ethylation and room temperature precollection. , 1994, Talanta.

[19]  B. Branfireun,et al.  Mercury dynamics of a temperate forested wetland. , 2004, The Science of the total environment.

[20]  L. Shang,et al.  Distribution and speciation of mercury in surface waters in mercury mining areas in Wanshan, Southwestern China , 2003 .

[21]  H. Biester,et al.  A first insight into mercury distribution and speciation in soils from the Almadén mining district, Spain , 2003 .

[22]  N. Senesi,et al.  Trace element inputs into soils by anthropogenic activities and implications for human health. , 1999, Chemosphere.

[23]  M. Horvat,et al.  Simple solvent extraction technique for elimination of matrix interferences in the determination of methylmercury in environmental and biological samples by ethylation-gas chromatography-cold vapor atomic fluorescence spectrometry. , 1996, Talanta.

[24]  B. J. Alloway,et al.  Heavy metals in soils , 1990 .

[25]  P. Porvari,et al.  Methylmercury Production in Flooded Soils: A Laboratory Study , 1995 .

[26]  J. Rudd,et al.  Sites of Methyl Mercury Production in Remote Canadian Shield , 1993 .

[27]  M. Horvat,et al.  Total mercury, methylmercury and selenium in mercury polluted areas in the province Guizhou, China. , 2003, The Science of the total environment.

[28]  T. Williams,et al.  Assessment of mercury contamination and human exposure associated with coastal disposal of waste from a cinnabar mining operation, Palawan, Philippines , 1999 .

[29]  C. Sladek,et al.  Evaluation of sequential and selective extraction methods for determination of mercury speciation and mobility in mine waste , 2003 .

[30]  Jorge Loredo,et al.  Geochemical characterisation of mercury mining spoil heaps in the area of Mieres (Asturias, northern Spain) , 1999 .

[31]  D. L. Fey,et al.  Environmental geochemistry of abandoned mercury mines in West-Central Nevada, USA , 2002 .