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Biogenesis of Mercury-Sulfur Nanoparticles in Plant Leaves from Atmospheric Gaseous Mercury
Alain Manceau;  Jianxu Wang;  Mauro Rovezzi;  Pieter Glatzel;  Xinbin Feng
2018
Source PublicationEnvironmental Science & Technology
Volume52Issue:7Pages:3935-3948
Abstract

Plant leaves serve both as a sink for gaseous elemental mercury (Hg) from the atmosphere and a source of toxic mercury to terrestrial ecosystems. Litterfall is the primary deposition pathway of atmospheric Hg to vegetated soils, yet the chemical form of this major Hg input remains elusive. We report the first observation of in vivo formation of mercury sulfur nanoparticles in intact leaves of 22 native plants from six different species across two sampling areas from China. The plants grew naturally in soils from a mercury sulfide mining and retorting region at ambient-air gaseous-Hg concentrations ranging from 131 +/- 19 to 636 +/- 186 ng m(-3) and had foliar Hg concentration between 1.9 and 31.1 ng Hg mg(-1) dry weight (ppm). High energy resolution X-ray absorption near-edge structure (HR-XANES) spectroscopy shows that up to 57% of the acquired Hg is nanoparticulate, and the remainder speciated as a bis-thiolate complex (Hg(SR)(2)). The fractional amount of nanoparticulate Hg is not correlated with Hg concentration. Variation likely depends on leaf age, plant physiology, and natural variability. Nanoparticulate Hg atoms are bonded to four sulfide or thiolate sulfur atoms arranged in a metacinnabar-type (beta-HgS) coordination environment. The nanometer dimension of the mercury sulfur clusters outmatches the known binding capacity of plant metalloproteins. These findings give rise to challenging questions on their exact nature, how they form, and their biogeochemical reactivity and fate in litterfall, whether this mercury pool is recycled or stored in soils. This study provides new evidence that metacinnabar-type nanoparticles are widespread in oxygenated environments.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8733
Collection环境地球化学国家重点实验室
Affiliation1.ISTerre, UniversitéGrenoble Alpes, CNRS, CS 40700, 38058 Grenoble, France
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Peopleʼs Republic of China
3.European Synchrotron Radiation Facility (ESRF), 71 Rue des Martyrs, 38000 Grenoble, France
Recommended Citation
GB/T 7714
Alain Manceau;Jianxu Wang;Mauro Rovezzi;Pieter Glatzel;Xinbin Feng. Biogenesis of Mercury-Sulfur Nanoparticles in Plant Leaves from Atmospheric Gaseous Mercury[J]. Environmental Science & Technology,2018,52(7):3935-3948.
APA Alain Manceau;Jianxu Wang;Mauro Rovezzi;Pieter Glatzel;Xinbin Feng.(2018).Biogenesis of Mercury-Sulfur Nanoparticles in Plant Leaves from Atmospheric Gaseous Mercury.Environmental Science & Technology,52(7),3935-3948.
MLA Alain Manceau;Jianxu Wang;Mauro Rovezzi;Pieter Glatzel;Xinbin Feng."Biogenesis of Mercury-Sulfur Nanoparticles in Plant Leaves from Atmospheric Gaseous Mercury".Environmental Science & Technology 52.7(2018):3935-3948.
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