scholarly journals Observation of Mercury Species Concentration in Atmospheric Deposition in Niigata City in Japan

2021 ◽  
Vol 31 (0) ◽  
pp. 55-63
Author(s):  
Takashi ONO ◽  
Tomohiro KOBAYASHI ◽  
Ayami MATSUZAKI ◽  
Seiichi TANAHASHI ◽  
Hiroaki YAGOH
Keyword(s):  
Atmospheric Deposition ◽  
Mercury Species ◽  
Species Concentration

scholarly journals Atmospheric Deposition Of Heavy Metals In Toronto

2021 ◽  
Author(s):  
Muhammad Yousaf
Keyword(s):  
Heavy Metals ◽  
Atmospheric Deposition ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Mercury Species ◽  
Plasma Atomic Emission Spectrometry ◽  
Deposition Rates ◽  
Inductively Coupled ◽  
Glass Surfaces

Atmospheric deposition rates of heavy metals (As, Cd, Co, Cu, Hg, Mn, Ni, Pb, and Zn) were determined from July 2009−December 2010 in downtown Toronto. Atmospheric deposition samples were collected using samplers with plastic, glass and water surfaces from two rooftops (15 m and 59 m above ground) in the city core of Toronto. Mercury species were analyzed using Cold Vapor Atomic Fluorescence Spectrophotometer (CVAFS) and the rest of metals were analyzed by acid digestion combined with Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The results showed that the deposition of heavy metals was higher on water surface as compared to both the plastic and glass surfaces and that Cu, Mn, Pb and Zn showed higher deposition rates as compared to As, Cd, Co and Ni. The deposition rates were higher on Kerr Hall North (KHN) site indicating contribution from local sources. For total mercury (THg) and methyl mercury (MeHg), the deposition rates were higher on Jorgenson (JOR) site as compared to KHN site.

scholarly journals Mercury Methylation in paddy soil: Source and distribution of mercury species at a Hg mining area, Guizhou Province, China

2016 ◽  
Author(s):  
L. Zhao ◽  
C. W. N. Anderson ◽  
G. L. Qiu ◽  
B. Meng ◽  
D. Y. Wang ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
Paddy Soil ◽  
Soil Layer ◽  
Ambient Air ◽  
Rice Paddy ◽  
Mercury Species ◽  
Low Concentration ◽  
Paddy Water ◽  
Hg Mining

Abstract. Rice paddy plantation for human consumption is dominant land uses throughout Asia. Rice paddy fields have been identified as important sites for methylmerucry (MeHg) production in the terrestrial ecosystem, and a primary pathway of MeHg exposure to human in mercury (Hg) mining areas. We compared the source and distribution of Hg species in different compartments of the rice paddy during a complete rice-growing season at two different typical Hg-contaminated mining sites: an abandoned site with high Hg concentration in soil but low concentration in atmosphere, and a current-day artisanal site with low concentration in soil but high concentration in atmosphere. The contribution of new Hg to the ecosystem from irrigation and atmospheric deposition was insignificant relative to the pool of old Hg; the dominant source of MeHg to paddy soil is in situ methylation of inorganic Hg. Elevated MeHg concentrations jointly with the high proportion of Hg as MeHg in paddy water and the surface soil layer at the artisanal s ite demonstrated active Hg methylation at this site only. We propose that the in situ production of MeHg is dependent on elevated IHg in the atmosphere, and the deposition of new Hg into a low pH anoxic geochemical system. In contrast, the absence of depth-dependent variability in the MeHg concentration in soil cores collected from abandoned Hg mining site, consistent with the low concentration of Hg in atmospheric deposition and high pH of the paddy water/irrigation water, suggested that the net production of MeHg was limited. We also propose that the concentration of Hg in ambient air is an indicator for the risk of MeHg accumulation in paddy rice.

scholarly journals Adsorption of mercury species on river sediments — effects of selected abiotic parameters

2010 ◽  
Vol 8 (1) ◽  
pp. 116-125 ◽  
Author(s):  
Pavlína Pelcová ◽  
Jana Margetínová ◽  
Tomáš Vaculovič ◽  
Josef Komárek ◽  
Vlastimil Kubáň
Keyword(s):  
River Sediments ◽  
Aqueous Media ◽  
Exchange Capacity ◽  
Adsorption Rate ◽  
Mercury Species ◽  
Media Composition ◽  
Species Concentration ◽  
Abiotic Parameters ◽  
Positive Correlations ◽  
Ph Range

AbstractAbiotic parameters (pH, temperature, current velocity, mercury species concentration, and sediment and aqueous media composition) influence mercury species (MeHg+, EtHg+, PhHg+ and inorganic Hg2+) adsorption on river sediments. The highest amount of adsorbed MeHg+ and EtHg+ (82–93% and 85–91% for static and agitated system, respectively) occurred at pH 3–4. For PhHg+ the maximum adsorption (90% and 95% for static and agitated systems) was located over the broad 3–10 pH range, while for Hg2+ (94% and 97% for static and agitated systems) it was at pH ∼ 3. Temperature (4.5–60°C) influenced the adsorption rate but not the quantity. Both rate and quantity increased in the order: static 2+ adsorption about 67%. Cations at pH 5.2 reduced either the adsorption rate (Ca2+, Al3+) or the total adsorption (Zn2+, Fe3+). Positive correlations were found between sediment C, N, S content as well as cation exchange capacity (CEC) with mercury adsorption (R = 0.45–0.66, 0.56–0.89, 0.45–0.61 and 0.55–0.73, respectively) while negative correlations were observed with Fe and Al (R = −0.63 to −0.90 and −0.65 to −0.86, respectively).

scholarly journals Atmospheric Deposition Of Heavy Metals In Toronto

2021 ◽  
Author(s):  
Muhammad Yousaf
Keyword(s):  
Heavy Metals ◽  
Atmospheric Deposition ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Mercury Species ◽  
Plasma Atomic Emission Spectrometry ◽  
Deposition Rates ◽  
Inductively Coupled ◽  
Glass Surfaces

Atmospheric deposition rates of heavy metals (As, Cd, Co, Cu, Hg, Mn, Ni, Pb, and Zn) were determined from July 2009−December 2010 in downtown Toronto. Atmospheric deposition samples were collected using samplers with plastic, glass and water surfaces from two rooftops (15 m and 59 m above ground) in the city core of Toronto. Mercury species were analyzed using Cold Vapor Atomic Fluorescence Spectrophotometer (CVAFS) and the rest of metals were analyzed by acid digestion combined with Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The results showed that the deposition of heavy metals was higher on water surface as compared to both the plastic and glass surfaces and that Cu, Mn, Pb and Zn showed higher deposition rates as compared to As, Cd, Co and Ni. The deposition rates were higher on Kerr Hall North (KHN) site indicating contribution from local sources. For total mercury (THg) and methyl mercury (MeHg), the deposition rates were higher on Jorgenson (JOR) site as compared to KHN site.

scholarly journals Mercury Budget and Scenario Analysis for the Marano-Grado Lagoon, Using Modelling and Observations

Proceedings ◽  
2019 ◽  
Vol 30 (1) ◽  
pp. 19
Author(s):  
Canu ◽  
Rosati ◽  
Solidoro
Keyword(s):  
Adriatic Sea ◽  
Mercury Species ◽  
Species Concentration ◽  
Sources Of Uncertainty ◽  
Lagoon Sediment ◽  
Us Epa ◽  
Trophic Webs ◽  
North Adriatic Sea ◽  
The Mediterranean Basin

The Marano-Grado Lagoon (MGL) is extensively contaminated by mercury (Hg) from local sources and long-term (500 years) tidally delivered inputs from the Idrija Hg mine (Slovenia) through Isonzo River suspended loads. Mercury-polluted coastal sites, often become sites of increased mercury methylation and act, in the long term, as secondary mercury sources for the Mediterranean Basin. Methylmercury (MeHg) produced upon Hg methylation bioaccumulates and biomagnifies in the trophic webs, and it is eventually transferred to humans via fish intake. We implemented a dynamic model released by US-EPA (WASP-Merc7) to the MGL (North Adriatic Sea, Italy) in order to assess the concentration of mercury species in water, sediment and particulate, and to quantify the mercury fluxes and budget within the lagoon itself and between the lagoon, the atmosphere and the Adriatic Sea. Furthermore, the model was used to simulate the mercury long-term dynamics to estimate the recovery time for Hg in lagoon sediment (about 600 years) and to explore future scenarios of climate change and rivers capping. Still several gaps exist in the knowledge on mercury species concentration and kinetics, the model results take also into account the major sources of uncertainty.

Atmospheric deposition of arsenic and selenium in ombrotrophic peat bogs

2003 ◽  
Vol 107 ◽  
pp. 1427-1427 ◽  
Author(s):  
J. Frank ◽  
M. Krachler ◽  
W. Shotyk
Keyword(s):  
Atmospheric Deposition ◽  
Peat Bogs ◽  
Ombrotrophic Peat

Atmospheric deposition: Effects on sculptures

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Adverse Effects ◽  
Atmospheric Deposition ◽  
Case Studies ◽  
Review Paper ◽  
Harmful Effect ◽  
Public Concern

Public concern over the deleterious effects of atmospheric deposition (AD) has grown rapidly due to its adverse effects (teratogenicity, toxicity, and carcinogenicity) to human, animals, and materials. The aim of this review is to describe the effect of the AD on sculptures, measures for its reduction, and case studies on maintenances of sculptures against the AD. To this end, a step-by-step review is outlined to discuss the harmful effect of AD contamination on many important sculptures. The review paper is also extended to describe preventive steps to reduce AD on sculptures to help reduce the risks associated with AD.

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