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Article ; Online: Dissolution Potential of Elemental Mercury in the Presence of Bisulfide and Implications for Mobilization.

Koenigsmark, Faye / Rivera, Nelson A / Pierce, Eric M / Hsu-Kim, Heileen

Environmental science & technology

2023 Volume 57, Issue 33, Page(s) 12388–12397

Abstract: Liquid elemental mercury ( ... ...

Abstract	Liquid elemental mercury (Hg
MeSH term(s)	Mercury/analysis ; Solubility ; Hydrogen Peroxide ; Sulfides ; Soil
Chemical Substances	Mercury (FXS1BY2PGL) ; Hydrogen Peroxide (BBX060AN9V) ; Sulfides ; Soil
Language	English
Publishing date	2023-08-10
Publishing country	United States
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.3c00694
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Utility of Diffusive Gradient in Thin-Film Passive Samplers for Predicting Mercury Methylation Potential and Bioaccumulation in Freshwater Wetlands.

Neal-Walthall, Natalia / Ndu, Udonna / Rivera, Nelson A / Elias, Dwayne A / Hsu-Kim, Heileen

Environmental science & technology

2022 Volume 56, Issue 3, Page(s) 1743–1752

Abstract: Mercury is a risk in aquatic ecosystems when the metal is converted to methylmercury (MeHg) and subsequently bioaccumulates in aquatic food webs. This risk can be difficult to manage because of the complexity of biogeochemical processes for mercury and ... ...

Abstract	Mercury is a risk in aquatic ecosystems when the metal is converted to methylmercury (MeHg) and subsequently bioaccumulates in aquatic food webs. This risk can be difficult to manage because of the complexity of biogeochemical processes for mercury and the need for accessible techniques to navigate this complexity. Here, we explored the use of diffusive gradient in thin-film (DGT) passive samplers as a tool to simultaneously quantify the methylation potential of inorganic Hg (IHg) and the bioaccumulation potential of MeHg in freshwater wetlands. Outdoor freshwater wetland mesocosms were amended with four isotopically labeled and geochemically relevant IHg forms that represent a range of methylation potentials (
MeSH term(s)	Bioaccumulation ; Ecosystem ; Environmental Monitoring/methods ; Fresh Water ; Mercury/analysis ; Methylation ; Methylmercury Compounds ; Water ; Water Pollutants, Chemical/analysis ; Wetlands
Chemical Substances	Methylmercury Compounds ; Water Pollutants, Chemical ; Water (059QF0KO0R) ; Mercury (FXS1BY2PGL)
Language	English
Publishing date	2022-01-19
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.1c06796
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Article: Nanoscale heterogeneity of arsenic and selenium species in coal fly ash particles: analysis using enhanced spectroscopic imaging and speciation techniques.

Rivera, Nelson A / Ling, Florence T / Jin, Zehao / Pattammattel, Ajith / Yan, Hanfei / Chu, Yong S / Peters, Catherine A / Hsu-Kim, Heileen

Environmental science. Nano

2023 Volume 10, Issue 7, Page(s) 1768–1777

Abstract: Coal combustion byproducts are known to be enriched in arsenic (As) and selenium (Se). This enrichment is a concern during the handling, disposal, and reuse of the ash as both elements can be harmful to wildlife and humans if mobilized into water and ... ...

Abstract	Coal combustion byproducts are known to be enriched in arsenic (As) and selenium (Se). This enrichment is a concern during the handling, disposal, and reuse of the ash as both elements can be harmful to wildlife and humans if mobilized into water and soils. The leaching potential and bioaccessibility of As and Se in coal fly ash depends on the chemical forms of these elements and their association with the large variety of particles that comprise coal fly ash. The overall goal of this research was to determine nanoscale and microscale solid phase mineral associations and oxidation states of As and Se in fly ash. We utilized nanoscale 2D imaging (30-50 nm spot size) with the Hard X-ray Nanoprobe (HXN) in combination with microprobe X-ray capabilities (∼5 μm resolution) to determine the As and Se elemental associations. Speciation of As and Se was also measured at the nano- to microscale with X-ray absorption spectroscopy. The enhanced resolution of HXN showed As and Se as either diffusely located around or comingled with Ca- and Fe-rich particles. The results also showed nanoparticles of Se attached to the surface of fly ash grains. Overall, a comparison of As and Se species across scales highlights the heterogeneity and complexity of chemical associations for these trace elements of concern in coal fly ash.
Language	English
Publishing date	2023-05-24
Publishing country	England
Document type	Journal Article
ZDB-ID	2758235-8
ISSN	2051-8161 ; 2051-8153
ISSN (online)	2051-8161
ISSN	2051-8153
DOI	10.1039/d2en01056a
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Article ; Online: Increased cytotoxicity of Pb

Lalwani, Pooja / King, Dillon E / Morton, Katherine S / Rivera, Nelson A / Huayta, Javier / Hsu-Kim, Heileen / Meyer, Joel N

Environmental science. Processes & impacts

2023 Volume 25, Issue 11, Page(s) 1743–1751

Abstract: ... Lead ( ... ...

Abstract	Lead (Pb
MeSH term(s)	Humans ; Lead/toxicity ; Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone/metabolism ; Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone/pharmacology ; Mitochondria/metabolism ; Calcium Channels/metabolism ; Calcium Channels/pharmacology ; Calcium
Chemical Substances	mitochondrial calcium uniporter ; Lead (2P299V784P) ; Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone (370-86-5) ; Calcium Channels ; Calcium (SY7Q814VUP)
Language	English
Publishing date	2023-11-15
Publishing country	England
Document type	Journal Article
ZDB-ID	2703814-2
ISSN	2050-7895 ; 2050-7887
ISSN (online)	2050-7895
ISSN	2050-7887
DOI	10.1039/d3em00188a
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Article: Utility of Diffusive Gradient in Thin-Film Passive Samplers for Predicting Mercury Methylation Potential and Bioaccumulation in Freshwater Wetlands

Neal-Walthall, Natalia / Ndu, Udonna / Rivera, Nelson A. / Elias, Dwayne A. / Hsu-Kim, Heileen

Environmental science & technology. 2022 Jan. 19, v. 56, no. 3

2022

Abstract	Mercury is a risk in aquatic ecosystems when the metal is converted to methylmercury (MeHg) and subsequently bioaccumulates in aquatic food webs. This risk can be difficult to manage because of the complexity of biogeochemical processes for mercury and the need for accessible techniques to navigate this complexity. Here, we explored the use of diffusive gradient in thin-film (DGT) passive samplers as a tool to simultaneously quantify the methylation potential of inorganic Hg (IHg) and the bioaccumulation potential of MeHg in freshwater wetlands. Outdoor freshwater wetland mesocosms were amended with four isotopically labeled and geochemically relevant IHg forms that represent a range of methylation potentials (²⁰²Hg²⁺, ²⁰¹Hg-humic acid, ¹⁹⁹Hg-sorbed to FeS, and ²⁰⁰HgS nanoparticles). Six weeks after the spikes, we deployed DGT samplers in the mesocosm water and sediments, evaluated DGT-uptake rates of total Hg, MeHg, and IHg (calculated by difference) for the Hg isotope spikes, and examined correlations with total Hg, MeHg, and IHg concentrations in sediment, water, and micro and macrofauna in the ecosystem. In the sediments, we observed greater relative MeHg concentrations from the initially dissolved IHg isotope spikes and lower MeHg levels from the initially particulate IHg spikes. These trends were consistent with uptake flux of IHg into DGTs deployed in surface sediments. Moreover, we observed correlations between total Hg-DGT uptake flux and MeHg levels in periphyton biofilms, submergent plant stems, snails, and mosquitofish in the ecosystem. These correlations were better for DGTs deployed in the water column compared to DGTs in the sediments, suggesting the importance of vertical distribution of bioavailable MeHg in relation to food sources for macrofauna. Overall, these results demonstrate that DGT passive samplers are a relatively simple and efficient tool for predicting IHg methylation and MeHg bioaccumulation potentials without the need to explicitly delineate IHg and MeHg speciation and partitioning in complex ecosystems.
Keywords	Gambusia ; bioaccumulation ; bioavailability ; biofilm ; environmental science ; fauna ; freshwater ; isotopes ; mercury ; methylation ; methylmercury compounds ; periphyton ; risk ; sediments ; spatial distribution ; wetlands
Language	English
Dates of publication	2022-0119
Size	p. 1743-1752.
Publishing place	American Chemical Society
Document type	Article
ISSN	1520-5851
DOI	10.1021/acs.est.1c06796
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Relative Reactivity and Bioavailability of Mercury Sorbed to or Coprecipitated with Aged Iron Sulfides.

Rivera, Nelson A / Bippus, Paige M / Hsu-Kim, Heileen

Environmental science & technology

2019 Volume 53, Issue 13, Page(s) 7391–7399

Abstract: The potential for inorganic mercury (Hg) to be converted to methylmercury depends, in part, on the chemical form of Hg and its bioavailability to anaerobic microorganisms that can methylate Hg. In anaerobic settings, Hg can be associated with sulfide ... ...

Abstract	The potential for inorganic mercury (Hg) to be converted to methylmercury depends, in part, on the chemical form of Hg and its bioavailability to anaerobic microorganisms that can methylate Hg. In anaerobic settings, Hg can be associated with sulfide phases, including ferrous iron sulfide (FeS), which can sorb or be coprecipitated with Hg. The objective of this study was to determine if the aging state of FeS alters the Hg coordination environment as well as the reactivity and bioavailability of sorbed and coprecipitated Hg species. FeS particles were synthesized with and without Hg
MeSH term(s)	Biological Availability ; Iron ; Mercury ; Methylmercury Compounds ; Sulfides
Chemical Substances	Methylmercury Compounds ; Sulfides ; Iron (E1UOL152H7) ; Mercury (FXS1BY2PGL)
Language	English
Publishing date	2019-06-18
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.9b00768
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Article: Plastic pellets trigger feeding responses in sea anemones

Diana, Zoie / Hsu-Kim, Heileen / Rittschof, Daniel / Rivera, Nelson A / Sawickij, Natasha

Aquatic toxicology. 2020 May, v. 222

2020

Abstract: Multiple mechanisms for plastic consumption by marine animals have been proposed based on the feeding cues and behavior of the animal studied. We investigated plastic consumption in sea anemones. We found that anemones readily consumed pristine National ... ...

Abstract	Multiple mechanisms for plastic consumption by marine animals have been proposed based on the feeding cues and behavior of the animal studied. We investigated plastic consumption in sea anemones. We found that anemones readily consumed pristine National Institute of Standards and Technology low-density polyethylene and high-density polyethylene II and III pre-production pellets. Anemone weight, crown area, and number of tentacles were measured before and after 12 days of daily pellet consumption. Crown area significantly increased for control anemones only. Fresh anemones were then sequentially fed consumed and egested pellets from two of the earlier daily trials to measure feeding retention time, which decreased over three to four feedings. The concentrations of elements in anemones (zinc, iron, arsenic, manganese, chromium, copper, vanadium, selenium, nickel, cadmium, and cobalt) were similar to control anemones that were not exposed to pellets. Lead concentrations were significantly higher in anemones fed HDPE III pellets as compared to control. Plastic consumption by marine animals might be reduced by reducing the amount of plastic that enters the ocean and understanding the chemical triggers underlying plastic consumption.
Keywords	animals ; Anthozoa ; arsenic ; cadmium ; chromium ; cobalt ; copper ; iron ; manganese ; nickel ; pellets ; polyethylene ; selenium ; vanadium ; zinc
Language	English
Dates of publication	2020-05
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	782699-0
ISSN	1879-1514 ; 0166-445X
ISSN (online)	1879-1514
ISSN	0166-445X
DOI	10.1016/j.aquatox.2020.105447
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Plastic pellets trigger feeding responses in sea anemones.

Diana, Zoie / Sawickij, Natasha / Rivera, Nelson A / Hsu-Kim, Heileen / Rittschof, Daniel

Aquatic toxicology (Amsterdam, Netherlands)

2020 Volume 222, Page(s) 105447

Abstract	Multiple mechanisms for plastic consumption by marine animals have been proposed based on the feeding cues and behavior of the animal studied. We investigated plastic consumption in sea anemones. We found that anemones readily consumed pristine National Institute of Standards and Technology low-density polyethylene and high-density polyethylene II and III pre-production pellets. Anemone weight, crown area, and number of tentacles were measured before and after 12 days of daily pellet consumption. Crown area significantly increased for control anemones only. Fresh anemones were then sequentially fed consumed and egested pellets from two of the earlier daily trials to measure feeding retention time, which decreased over three to four feedings. The concentrations of elements in anemones (zinc, iron, arsenic, manganese, chromium, copper, vanadium, selenium, nickel, cadmium, and cobalt) were similar to control anemones that were not exposed to pellets. Lead concentrations were significantly higher in anemones fed HDPE III pellets as compared to control. Plastic consumption by marine animals might be reduced by reducing the amount of plastic that enters the ocean and understanding the chemical triggers underlying plastic consumption.
MeSH term(s)	Animals ; Biological Monitoring/methods ; Feeding Behavior/drug effects ; Metals/analysis ; Models, Theoretical ; Polyethylenes/toxicity ; Sea Anemones/chemistry ; Sea Anemones/drug effects ; Sea Anemones/growth & development ; Trace Elements/analysis ; Water Pollutants, Chemical/toxicity
Chemical Substances	Metals ; Polyethylenes ; Trace Elements ; Water Pollutants, Chemical
Language	English
Publishing date	2020-02-12
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	782699-0
ISSN	1879-1514 ; 0166-445X
ISSN (online)	1879-1514
ISSN	0166-445X
DOI	10.1016/j.aquatox.2020.105447
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Article ; Online: Risk of lead exposure from wild game consumption from cross-sectional studies in Madre de Dios, Peru.

Berky, Axel J / Robie, Emily / Navio Chipa, Susy / Ortiz, Ernesto J / Palmer, Emma J / Rivera, Nelson A / Maria Morales Avalos, Ana / Meyer, Joel N / Hsu-Kim, Heileen / Pan, William K

Lancet Regional Health. Americas

2022 Volume 12

Abstract: Background: Studies have shown elevated blood lead levels (BLL) in residents of remote communities in the Amazon, yet sources of lead exposure are not fully understood, such as lead ammunition consumed in wild game.: Methods: Data was collected ... ...

Abstract	Background: Studies have shown elevated blood lead levels (BLL) in residents of remote communities in the Amazon, yet sources of lead exposure are not fully understood, such as lead ammunition consumed in wild game. Methods: Data was collected during two cross-sectional studies that enrolled 307 individuals in 26 communities. Regression models with community random effects were used to evaluate risk factors for BLLs, including diet, water source, smoking, sex, age, and indigenous status. The All-Ages Lead Model (AALM) from the Environmental Protection Agency (EPA) was used to estimate background and dose from wild game consumption. Findings: Indigenous status and wild game consumption were associated with increased BLLs. Indigenous participants had 2.52 μg/dL (95% CI: 1.95-3.24) higher BLLs compared to non-indigenous. Eating wild game was associated with a 1.41 μg/dL (95% CI: 1.20-1.70) increase in BLLs. Two or more portions per serving were associated with increased BLLs of 1.66 μg/dL (95% CI: 1.10-2.57), compared to smaller servings. Using the AALM, we estimate background lead exposures to be 20 μg/day with consumption of wild game contributing 500 μg/meal. Lastly, we found a strong association between BLLs and mercury exposure. Interpretation: Consumption of wild game hunted with lead ammunition may pose a common source of lead exposure in the Amazon. Communities that rely on wild game and wild fish may face a dual burden of exposure to lead and mercury, respectively.
Language	English
Publishing date	2022-05-08
Publishing country	England
Document type	Journal Article
ISSN	2667-193X
ISSN (online)	2667-193X
DOI	10.1016/j.lana.2022.100266
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Article: Lack of Detectable Direct Effects of Silver and Silver Nanoparticles on Mitochondria in Mouse Hepatocytes

Wang, Lu / Mello, Danielle F. / Zucker, Robert M. / Rivera, Nelson A. / Rogers, Nicholas M. K. / Geitner, Nicholas K. / Boyes, William K. / Wiesner, Mark R. / Hsu-Kim, Heileen / Meyer, Joel N.

Environmental science & technology. 2021 Aug. 04, v. 55, no. 16

2021

Abstract: Silver nanoparticles (AgNPs) are well-proven antimicrobial nanomaterials, yet little is elucidated regarding the mechanism underlying cytotoxicity induced by these nanoparticles. Here, we tested the hypothesis that mitochondria are primary intracellular ... ...

Abstract	Silver nanoparticles (AgNPs) are well-proven antimicrobial nanomaterials, yet little is elucidated regarding the mechanism underlying cytotoxicity induced by these nanoparticles. Here, we tested the hypothesis that mitochondria are primary intracellular targets of two AgNPs and silver ions in mouse hepatocytes (AML12) cultured in glucose- and galactose-based media. AML12 cells were more sensitive to mitochondrial uncoupling when grown with galactose rather than glucose. However, 24 h treatments with 15 nm AgNPs and 6 nm GA-AgNPs (5 and 10 μg/mL) and AgNO₃ (1 and 3 μg/mL), concentrations that resulted in either 10 or 30% cytotoxicity, failed to cause more toxicity to AML12 cells grown on galactose than glucose. Furthermore, colocalization analysis and subcellular Ag quantification did not show any enrichment of silver content in mitochondria in either medium. Finally, the effects of the same exposures on mitochondrial respiration were mild or undetectable, a result inconsistent with mitochondrial toxicity causing cell death. Our results suggest that neither ionic Ag nor the AgNPs that we tested specifically target mitochondria and are inconsistent with mitochondrial dysfunction being the primary cause of cell death after Ag exposure under these conditions.
Keywords	cell death ; cytotoxicity ; environmental science ; galactose ; glucose ; hepatocytes ; mice ; mitochondria ; nanosilver ; silver
Language	English
Dates of publication	2021-0804
Size	p. 11166-11175.
Publishing place	American Chemical Society
Document type	Article
ISSN	1520-5851
DOI	10.1021/acs.est.1c02295
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