NDLI: Effect of Thioligands on Plant-Hg Accumulation and Volatilisation from Mercury-contaminated Mine Tailings

Content Provider	Springer Nature Link
Author	More, Fabio N. Anderson, Christopher W. N. Stewart, Robert B. Robinson, Brett H. mura, Roberto Ghomshei, Mory Meech, John A
Copyright Year	2005
Abstract	This study investigated the effect of thioligands on mercury (Hg) volatilisation and plant accumulation for Brassica junceaplants grown in mine tailings collected from artisanal gold mines in Brazil (the Serra Pelada mine) and China (the Gold Mountain mine). Plants were treated with either (NH$_{4}$)$_{2}$S$_{2}$O$_{3}$or NH$_{4}$SCN and enclosed in gas-tight volatilisation chambers. Elemental Hg released from substrates was captured in a two-trap system containing 5 KMnO$_{4}$dissolved in 2N H$_{2}$SO$_{4}$. Mercury accumulation was enhanced in the presence of (NH$_{4}$)$_{2}$S$_{2}$O$_{3}$ for plants grown in GM tailings. There was no significant increase in the plant-Hg accumulation after application of NH$_{4}$SCN to the SP tailings. Volatilisation from planted substrates was not affected by the application of thioligands to either GM or SP mine tailings. Mercury volatilisation from planted substrates was significantly higher than from control substrates. Abiotic (photoreduction) and biotic (microbial interactions) factors might be linked to the enhanced plant effect on Hg volatilisation. There was no significant correlation for the Hg mass released from substrates and the amount of Hg uptake by roots and translocated to shoots. Our results indicate that volatilisation and plant-Hg accumulation are two independent processes. Thiosulphate-induced plant-Hg accumulation may be a potential tool for the phytoextraction of Hg contaminated soils but there are risks of groundwater contamination by Hg-containing leachates.
Starting Page	233
Ending Page	246
Page Count	14
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	275
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	mercury mine tailings phytoextraction plant-Hg accumulation thioligands volatilisation Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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