Uptake of Mercury Vapor by Wheat

Browne, Christopher L.; Fang, Sheng

doi:10.1104/pp.61.3.430

Cited by 65 publications

(25 citation statements)

References 7 publications

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“…Uptake of Hg from the air via the stomata of untreated plants is a possible reason for the relatively high Hg concentrations in these plants in comparison to plants growing in a medium without Hg (Suckcharoen, 1978;Gö thberg et al, 2002). Uptake of gaseous Hg via the stomata has been shown in laboratory studies (Browne and Fang, 1978;Du and Fang, 1983;Cavallini et al, 1999). Although the accumulation of Hg in aerial plant parts increased in direct proportion to Hg concentration in the culture medium, it was quite stable for higher concentrations.…”

Section: Hg Accumulationmentioning

confidence: 98%

Detection and Quantification of Unbound Phytochelatin 2 in Plant Extracts of Brassica napus Grown with Different Levels of Mercury

et al. 2006

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The mercury (Hg) accumulation mechanism was studied in rape (Brassica napus) plants grown under a Hg concentration gradient (0 mM-1,000 mM). Hg mainly accumulated in roots. Therefore, the presence of phytochelatins (PCs) was studied in the roots of the plants. The high stability of the PC-Hg multicomplexes (mPC-nHg) seems to be the main reason for the lack of previous Hg-PC characterization studies. We propose a modification of the method to detect and quantify unbound PC of Hg in plant extracts via high-performance liquid chromatography coupled to electrospray tandem mass spectrometry and inductively coupled plasma mass spectrometry in parallel. We separated the PC from the Hg by adding the chelating agent sodium 2,3-dimercaptopropanesulfonate monohydrate. We only detected the presence of PC after the addition of the chelating agent. Some multicomplexes mPC-nHg could be formed but, due to their large sizes, could not be detected. In this study, only PC 2 was observed in plant samples. Hg accumulation was correlated with PC 2 concentration (r 2 5 0.98).

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Section: Hg Accumulationmentioning

confidence: 98%

Detection and Quantification of Unbound Phytochelatin 2 in Plant Extracts of Brassica napus Grown with Different Levels of Mercury

et al. 2006

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“…However, there are few recent data on the deposition of Hg, in particular on dry deposition to forests. Some analyses suggest that wet deposition cannot account for all of the Hg apparently accumulating in fish and lakes in forested watersheds, and experimental data have demonstrated the ability of plants to accumulate Hg vapor from the air [e.g., Browne and Fang, 1978;Lindberg et al, 1979]. These observations point to the potential importance of Hg dry deposition.…”

Section: Introductionmentioning

confidence: 99%

Atmosphere‐surface exchange of mercury in a forest: Results of modeling and gradient approaches

Lindbeŕg¹,

Meyers²,

Taylor³

et al. 1992

J. Geophys. Res.

211

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We have modified recently published dry deposition models to estimate deposition velocities (Vd) for Hg in both fine aerosol and vapor form to forest canopy surfaces. Aerosol and total vapor phase Hg concentrations in air previously measured at Walker Branch Watershed in Tennessee have been used with model results to estimate dry deposition to a deciduous forest. The concentration data confirm that airborne Hg is dominated by vapor forms at this site and exhibits concentrations moderately above continental background levels. The modeled Vd values reflect published data which suggest that dry deposition of Hg vapor is strongly controlled by surface transport processes, notably stomatal and mesophyll resistances, the latter dominating. Weekly mean Vd values ranged from 0.006 (winter) to 0.12 (summer) cm s−1. We have also measured concentration gradients of Hg vapor in air above this forest to estimate air‐surface exchange during short‐term experiments. While the model results indicate that the canopy is a sink for Hg vapor, the concentration profiles suggest that the forest soils are a source during some periods, the combined effect of which is net Hg fluxes in the upward direction. Application of a detailed canopy turbulence model yielded soil emission rates of the order of 50 ng Hg m−2 h−1, ∼10% of which is deposited in the canopy. Our modeled dry deposition estimates plus limited measurements of wet deposition in this area suggest that dry and wet deposition may be comparable in magnitude.

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“…Furthermore, dry deposition of atmospheric Hg to forest canopies has been recognized as an important sink for atmospheric Hg. Foliage can both take up and emit Hg 0 and Hg 0 may in-turn be oxidized to form other Hg species which may adsorb to or wash off from the leaf surface (Browne and Fang, 1978;Lindberg, 1996). For locations in Scandinavia and North America, it has been reported that fluxes of Hg in throughfall exceeded those of wet deposition by 60-90 % Munthe et al, 1995;Rea et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of mercury deposition fluxes in Wanshan Hg mining area, Guizhou province, China

et al. 2012

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Abstract. The legacy of long-term mining activities in Wanshan mercury (Hg) mining area (WMMA), Guizhou, China including a series of environmental issues related to Hg pollution. The spatial distribution of gaseous elemental mercury (Hg 0 ) concentrations in ambient air were monitored using a mobile RA-915 + Zeeman Mercury Analyzer during daytime and night time in May 2010. The data imply that calcines and mine wastes piles located at Dashuixi and on-going artisanal Hg mining activities at Supeng were major sources of atmospheric mercury in WMMA. For a full year (May 2010 to May 2011), sampling of precipitation and throughfall were conducted on a weekly basis at three sites (Shenchong, Dashuixi, and Supeng) within WMMA. Hg in deposition was characterized by analysis of total Hg (THg) and dissolved Hg (DHg) concentrations. The corresponding data exhibit a high degree of variability, both temporarily and spatially. The volume-weighted mean THg concentrations in precipitation and throughfall samples were 502.6 ng l −1 and 977.8 ng l −1 at Shenchong, 814.1 ng l −1 and 3392.1 ng l −1 at Dashuixi, 7490.1 ng l −1 and 9641.5 ng l −1 at Supeng, respectively. THg was enhanced in throughfall compared to wet deposition samples by up to a factor of 7. The annual wet Hg deposition fluxes were 29.1, 68.8 and 593.1 µg m −2 yr −1 at Shenchong, Dashuixi and Supeng, respectively, while the annual dry Hg deposition fluxes were estimated to be 378.9, 2613.6 and 6178 µg m −2 yr −1 at these sites, respectively. Dry deposition played a dominant role in total atmospheric Hg deposition in WMMA since the dry deposition fluxes were 10.4-37.9 times higher than the wet deposition fluxes during the whole sample period. Our data showed that air deposition was still an important pathway of Hg contamination to the local environment in WMMA.

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Uptake of Mercury Vapor by Wheat

Abstract: Using a whole-plant chamber and '3Hg-labeled mercury, a quantitative study was

Cited by 65 publications

References 7 publications

Detection and Quantification of Unbound Phytochelatin 2 in Plant Extracts of Brassica napus Grown with Different Levels of Mercury

Detection and Quantification of Unbound Phytochelatin 2 in Plant Extracts of Brassica napus Grown with Different Levels of Mercury

Atmosphere‐surface exchange of mercury in a forest: Results of modeling and gradient approaches

Spatial distribution of mercury deposition fluxes in Wanshan Hg mining area, Guizhou province, China

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