Mercury contamination level and speciation inventory in Lakes Titicaca & Uru-Uru (Bolivia): Current status and future trends

被引：50

作者：

Guedron, S. ^{[1
,2
]}

Point, D. ^{[3
,4
]}

Acha, D. ^{[4
]}

Bouchet, S. ^{[5
]}

Baya, P. A. ^{[3
]}

Tessier, E. ^{[5
]}

Monperrus, M. ^{[5
]}

Molina, C. I. ^{[4
]}

Groleau, A. ^{[6
]}

Chauvaud, L. ^{[2
,7
]}

Thebault, J. ^{[7
]}

Amice, E. ^{[7
]}

Alanoca, L.

Duwig, C. ^{[8
]}

Uzu, G. ^{[8
]}

Lazarro, X. ^{[9
]}

Bertrand, A. ^{[10
]}

Bertrand, S. ^{[10
]}

Barbraud, C. ^{[11
]}

Delord, K. ^{[11
]}

Gibon, F. M. ^{[9
]}

Ibanez, C. ^{[12
]}

Flores, M. ^{[2
,4
]}

Fernandez Saavedra, P. ^{[4
]}

Ezpinoza, M. E. ^{[4
]}

Heredia, C. ^{[4
]}

Rocha, F.

Zepita, C. ^{[4
]}

Amouroux, D. ^{[4
,5
]}

机构：

[1] Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,ISTerre, F-38000 Grenoble, France

[2] Univ Mayor San Andres, Inst Invest Quim, Lab Hidroquim, Campus Univ Cota Cota,Casilla 3161, La Paz, Bolivia

[3] Univ Paul Sabatier, Geosci Environm Toulouse, UMR5563, IRD UR 234, 14 Ave Edouard Belin, F-31400 Toulouse, France

[4] Univ Mayor San Andres, Inst Ecol, UCA, Campus Univ Cota Cota,Casilla 3161, La Paz, Bolivia

[5] Univ Pau & Pays Adour, CNRS, Inst Sci Analyt & Phys Chim Environm & Mat, MIRA,UMR5254, F-64000 Pau, France

[6] IPGP, 1 Rue Jussieu, F-75238 Paris 05, France

[7] IUEM, UMR 6539, Lab Sci Environm Marin LEMAR, Technopole Brest Iroise,Rue Dumont Urville, F-29280 Plouzane, France

[8] Univ Savoie Mt Blanc, Univ Grenoble Alpes, CNRS, IRD,IFSTTAR,IGE, F-38000 Grenoble, France

[9] Inst Rech Dev, Biol ORganismes & Ecosyst Aquat BOREA, UMR 7208, Paris, France

[10] Univ Montpellier, IRD, MARine Biodivers Exploitat & Conservat MARBEC, Pl Eugene Bataillon,Bat 24,CC093, F-34095 Montpellier 5, France

[11] Univ La Rochelle, Lab Ctr Etud Biol Chize CEBC, UMR 7372, CNRS, 405 Route La Canauderie, F-79360 Villiers En Bois, France

[12] Univ Publ El Alto, Ecol & Recursos Nat, UPA, El Alto, Bolivia

来源：

ENVIRONMENTAL POLLUTION | 2017年 / 231卷

关键词：

Mercury; Water; Sediment; Biota; Titicaca; GREAT-LAKES; ATMOSPHERIC MERCURY; EAST-AFRICA; EARLY DIAGENESIS; TIBETAN PLATEAU; METHYLMERCURY; SEDIMENTS; WATER; DEPOSITION; ALTIPLANO;

D O I：

10.1016/j.envpol.2017.08.009

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Aquatic ecosystems of the Bolivian Altiplano (similar to 3800 m a.s.l.) are characterized by extreme hydro-climatic constrains (e.g., high UV-radiations and low oxygen) and are under the pressure of increasing anthropogenic activities, unregulated mining, agricultural and urban development. We report here a complete inventory of mercury (Hg) levels and speciation in the water column, atmosphere, sediment and key sentinel organisms (i.e., plankton, fish and birds) of two endorheic Lakes of the same watershed differing with respect to their size, eutrophication and contamination levels. Total Hg (THg) and mono-methylmercury (MMHg) concentrations in filtered water and sediment of Lake Titicaca are in the lowest range of reported levels in other large lakes worldwide. Downstream, Hg levels are 3-10 times higher in the shallow eutrophic Lake Uru-Uru than in Lake Titicaca due to high Hg inputs from the surrounding mining region. High percentages of MMHg were found in the filtered and unfiltered water rising up from <1 to similar to 50% THg from the oligoihetero-trophic Lake Titicaca to the eutrophic Lake Uru-Uru. Such high % MMHg is explained by a high in situ MMHg production in relation to the sulfate rich substrate, the low oxygen levels of the water column, and the stabilization of MMHg due to abundant ligands present in these alkaline waters. Differences in MMHg concentrations in water and sediments compartments between Lake Titicaca and Uru-Uru were found to mirror the offset in MMHg levels that also exist in their respective food webs. This suggests that in situ MMHg baseline production is likely the main factor controlling MMHg levels in fish species consumed by the local population. Finally, the increase of anthropogenic pressure in Lake Titicaca may probably enhance eutrophication processes which favor MMHg production and thus accumulation in water and biota. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：262 / 270

页数：9

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