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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba(TlHg)2 by Materials Project

Ba(HgTl)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Ba is bonded in a 12-coordinate geometry to nine Hg and six equivalent Tl atoms. There are a spread of Ba–Hg bond distances ranging from 3.67–4.03 Å. There are four shorter (3.74 Å) and two longer (4.23 Å) Ba–Tl bond lengths. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 2-coordinate geometry to five equivalent Ba, three Hg, and two equivalent Tl atoms. There are two shorter (2.98 Å) and one longer (2.99 Å) Hg–Hg bond lengths. Both Hg–Tl bond lengths are 3.24 Å. In the second Hg site, Hg is bonded in a 8-coordinate geometry to four equivalent Ba, two equivalent Hg, and two equivalent Tl atoms. Both Hg–Tl bond lengths are 3.18 Å. Tl is bonded in a 2-coordinate geometry to three equivalent Ba, two Hg, and five equivalent Tl atoms. There are one shorter (3.19 Å) and four longer (3.45 Å) Tl–Tl bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg5(ClO)4 by Materials Project

Hg5(OCl)4 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one Hg5(OCl)4 sheet oriented in the (1, 0, 1) direction. there are three inequivalent Hg sites. In the first Hg site, Hg is bonded in a 2-coordinate geometry to two O and three Cl atoms. There are one shorter (2.12 Å) and one longer (2.17 Å) Hg–O bond lengths. There are a spread of Hg–Cl bond distances ranging from 2.80–3.02 Å. In the second Hg site, Hg is bonded in a linear geometry to two O and one Cl atom. There are one shorter (2.04 Å) and one longer (2.08 Å) Hg–O bond lengths. The Hg–Cl bond length is 3.07 Å. In the third Hg site, Hg is bonded in a linear geometry to two equivalent O atoms. Both Hg–O bond lengths are 2.07 Å. There are two inequivalent O sites. In the first O site, O is bonded in a trigonal non-coplanar geometry to three Hg atoms. In the second O site, O is bonded in a bent 120 degrees geometry to two Hg atoms. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a 2-coordinate geometry to three Hg atoms. In the second Cl site, Cl is bonded in a distorted water-like geometry to one Hg and one Cl atom. The Cl–Cl bond length is 2.63 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2ClO by Materials Project

Hg2OCl crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 3-coordinate geometry to two equivalent O2- and two equivalent Cl1- atoms. There are one shorter (2.30 Å) and one longer (2.56 Å) Hg–O bond lengths. There are one shorter (2.61 Å) and one longer (3.31 Å) Hg–Cl bond lengths. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to two equivalent O2- and two equivalent Cl1- atoms. Both Hg–O bond lengths are 2.32 Å. Both Hg–Cl bond lengths are 2.89 Å. In the third Hg+1.50+ site, Hg+1.50+ is bonded in a distorted linear geometry to two equivalent O2- and four equivalent Cl1- atoms. Both Hg–O bond lengths are 2.07 Å. There are two shorter (3.25 Å) and two longer (3.40 Å) Hg–Cl bond lengths. O2- is bonded to four Hg+1.50+ atoms to form a mixture of distorted edge and corner-sharing OHg4 tetrahedra. Cl1- is bonded in a 2-coordinate geometry to five Hg+1.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg8Br3O4 by Materials Project

Hg8O4Br3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are eight inequivalent Hg+1.38+ sites. In the first Hg+1.38+ site, Hg+1.38+ is bonded in a 2-coordinate geometry to two O2- and two equivalent Br1- atoms. There are one shorter (2.12 Å) and one longer (2.13 Å) Hg–O bond lengths. There are one shorter (3.18 Å) and one longer (3.38 Å) Hg–Br bond lengths. In the second Hg+1.38+ site, Hg+1.38+ is bonded in a 3-coordinate geometry to one Hg+1.38+, two O2-, and one Br1- atom. The Hg–Hg bond length is 2.75 Å. There are one shorter (2.41 Å) and one longer (2.45 Å) Hg–O bond lengths. The Hg–Br bond length is 2.83 Å. In the third Hg+1.38+ site, Hg+1.38+ is bonded in a distorted L-shaped geometry to one Hg+1.38+ and one Br1- atom. The Hg–Hg bond length is 3.12 Å. The Hg–Br bond length is 3.83 Å. In the fourth Hg+1.38+ site, Hg+1.38+ is bonded in a distorted trigonal planar geometry to one O2- and two Br1- atoms. The Hg–O bond length is 3.07 Å. There are one shorter (3.17 Å) and one longer (3.42 Å) Hg–Br bond lengths. In the fifth Hg+1.38+ site, Hg+1.38+ is bonded in a distorted bent 120 degrees geometry to one Hg+1.38+, one O2-, and one Br1- atom. The Hg–O bond length is 3.04 Å. The Hg–Br bond length is 2.83 Å. In the sixth Hg+1.38+ site, Hg+1.38+ is bonded in a distorted single-bond geometry to one Hg+1.38+, one O2-, and one Br1- atom. The Hg–O bond length is 2.51 Å. The Hg–Br bond length is 3.52 Å. In the seventh Hg+1.38+ site, Hg+1.38+ is bonded in a 2-coordinate geometry to one Hg+1.38+ and two equivalent Br1- atoms. The Hg–Hg bond length is 2.64 Å. There are one shorter (2.56 Å) and one longer (3.14 Å) Hg–Br bond lengths. In the eighth Hg+1.38+ site, Hg+1.38+ is bonded in a 3-coordinate geometry to three O2- and one Br1- atom. There are two shorter (2.31 Å) and one longer (2.35 Å) Hg–O bond lengths. The Hg–Br bond length is 3.08 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four Hg+1.38+ atoms to form corner-sharing OHg4 tetrahedra. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Hg+1.38+ and one Br1- atom. The O–Br bond length is 1.78 Å. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two Hg+1.38+ and one O2- atom. The O–O bond length is 1.42 Å. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Hg+1.38+ and one O2- atom. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 1-coordinate geometry to three Hg+1.38+ and one O2- atom. In the second Br1- site, Br1- is bonded in a distorted L-shaped geometry to three Hg+1.38+ atoms. In the third Br1- site, Br1- is bonded in a 5-coordinate geometry to five Hg+1.38+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Feasibility of Metal Oxide Glasses and Polymer Membranes as Sorbents for Gaseous Oxidized Mercury

Mass spectrometry methods are currently under development by the atmospheric mercury (Hg) research community to elucidate the identity of atmospheric oxidized mercury (Hg II ) compounds. Due to high instrument detection limits, materials that can quantitatively preconcentrate atmospheric Hg II without facilitating compound-altering chemical reactions are needed to support these methods. Cation exchange membranes (CEM) and nylon membranes are currently used to preconcentrate ambient Hg II for concentration measurements and Hg II compound estimation, respectively. However, CEM and nylon membranes are poor candidates for observations by mass spectrometry methods due to release of interfering compounds upon heating; glasses do not have this problem. Here, three metal oxide glasses were explored as potential alternatives for Hg II preconcentration for future use with mass spectrometry methods: calcium phosphate (CaP), iron phosphate (FeP), and calcium aluminate (CaAl). The glasses demonstrated quantitative selective capture of HgBr 2 without capture of Hg 0 . Under ambient conditions, the CaP, FeP, and CaAl sorbed 36.4 ± 12.6% of the total HgII as the CEM. However, when Hg concentrations were normalized to surface area, CaP, FeP, and CaAl sorbed more HgBr 2 in the laboratory and ambient HgII compared to CEM. The CEM and CaP retained similar concentrations of HgBr 2 when preloaded samples were deployed in the field. Additionally, a permeation tube-based calibrator was used to load sorbents with HgBr 2 for investigation of HgII retention on CEM and thermal desorption profile changes on nylon membranes during active sampling. Nylon membranes were purchased from three vendors and used to compare HgBr 2 retention; a different HgBr 2 thermal desorption profile was achieved for each vendor’s nylon membrane.

Amides↗
DOE OSTI2020

Materials Data on MgHg3 by Materials Project

MgHg3 crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. Mg is bonded in a 10-coordinate geometry to ten Hg atoms. There are a spread of Mg–Hg bond distances ranging from 3.14–3.25 Å. There are three inequivalent Hg sites. In the first Hg site, Hg is bonded in a 10-coordinate geometry to four equivalent Mg and six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.10–3.27 Å. In the second Hg site, Hg is bonded in a 2-coordinate geometry to two equivalent Mg and four equivalent Hg atoms. In the third Hg site, Hg is bonded in a 4-coordinate geometry to four equivalent Mg and two equivalent Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeHg3 by Materials Project

FeHg3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Fe is bonded to twelve equivalent Hg atoms to form a mixture of face and corner-sharing FeHg12 cuboctahedra. There are six shorter (2.91 Å) and six longer (3.22 Å) Fe–Hg bond lengths. Hg is bonded in a 2-coordinate geometry to four equivalent Fe and six equivalent Hg atoms. There are four shorter (3.01 Å) and two longer (3.07 Å) Hg–Hg bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cd2Hg2H(SeO5)2 by Materials Project

Hg2Cd2H(SeO5)2 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. there are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.13–2.69 Å. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.08–3.05 Å. Cd2+ is bonded in a 5-coordinate geometry to one H1+ and five O2- atoms. The Cd–H bond length is 2.49 Å. There are a spread of Cd–O bond distances ranging from 2.23–2.38 Å. H1+ is bonded in a distorted bent 120 degrees geometry to two equivalent Cd2+ atoms. Se6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Se–O bond distances ranging from 1.66–1.70 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cd2+ and one Se6+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to one Hg+1.50+, one Cd2+, and one Se6+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Hg+1.50+, one Cd2+, and one Se6+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Hg+1.50+ and one Se6+ atom. In the fifth O2- site, O2- is bonded to two Hg+1.50+ and two equivalent Cd2+ atoms to form a mixture of edge and corner-sharing OCd2Hg2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgHg5 by Materials Project

MgHg5 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Mg is bonded to twelve Hg atoms to form a mixture of corner and edge-sharing MgHg12 cuboctahedra. There are six shorter (3.24 Å) and six longer (3.35 Å) Mg–Hg bond lengths. There are two inequivalent Hg sites. In the first Hg site, Hg is bonded in a 2-coordinate geometry to two equivalent Mg atoms. In the second Hg site, Hg is bonded in a distorted trigonal planar geometry to three equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2PO4 by Materials Project

Hg2PO4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to two O2- atoms. There are one shorter (2.19 Å) and one longer (2.60 Å) Hg–O bond lengths. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Hg–O bond distances ranging from 2.26–2.49 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.54 Å) and two longer (1.57 Å) P–O bond length. In the second P5+ site, P5+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two Hg+1.50+ and one P5+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Hg+1.50+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Hg+1.50+ and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn2Hg2H3(SeO5)2 by Materials Project

Hg2Zn2H3(SeO5)2 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a distorted linear geometry to two O2- atoms. There are one shorter (2.13 Å) and one longer (2.15 Å) Hg–O bond lengths. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.18–3.08 Å. Zn2+ is bonded to five O2- atoms to form ZnO5 trigonal bipyramids that share corners with three equivalent SeO4 tetrahedra and an edgeedge with one ZnO5 trigonal bipyramid. There are a spread of Zn–O bond distances ranging from 2.06–2.11 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted single-bond geometry to one H1+ and one O2- atom. The H–H bond length is 1.01 Å. The H–O bond length is 1.22 Å. In the second H1+ site, H1+ is bonded in a water-like geometry to two equivalent H1+ atoms. Se5+ is bonded to four O2- atoms to form SeO4 tetrahedra that share corners with three equivalent ZnO5 trigonal bipyramids. There are a spread of Se–O bond distances ranging from 1.68–1.72 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to two Hg+1.50+ and two equivalent Zn2+ atoms to form a mixture of edge and corner-sharing OZn2Hg2 tetrahedra. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to one Zn2+ and one Se5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Hg+1.50+, one Zn2+, and one Se5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Zn2+ and one Se5+ atom. In the fifth O2- site, O2- is bonded to two Hg+1.50+ and two equivalent Zn2+ atoms to form a mixture of edge and corner-sharing OZn2Hg2 tetrahedra. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Hg+1.50+, one H1+, and one Se5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HgO2 by Materials Project

HgO2 crystallizes in the orthorhombic Pbca space group. The structure is one-dimensional and consists of four HgO2 ribbons oriented in the (1, 0, 0) direction. Hg is bonded in a linear geometry to two equivalent O atoms. Both Hg–O bond lengths are 2.13 Å. O is bonded in a 2-coordinate geometry to one Hg and one O atom. The O–O bond length is 1.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg2NO4 by Materials Project

HgHgONO3 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four nitric acid molecules and one HgHgO sheet oriented in the (1, 0, 0) direction. In the HgHgO sheet, there are two inequivalent Hg+1.50+ sites. In the first Hg+1.50+ site, Hg+1.50+ is bonded in a 2-coordinate geometry to two equivalent O2- atoms. Both Hg–O bond lengths are 2.11 Å. In the second Hg+1.50+ site, Hg+1.50+ is bonded in a 1-coordinate geometry to two equivalent O2- atoms. There are one shorter (2.20 Å) and one longer (3.02 Å) Hg–O bond lengths. O2- is bonded to four Hg+1.50+ atoms to form a mixture of distorted edge and corner-sharing OHg4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hg4SbO6 by Materials Project

Hg4SbO6 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one Hg4SbO6 sheet oriented in the (0, 0, 1) direction. there are four inequivalent Hg+1.75+ sites. In the first Hg+1.75+ site, Hg+1.75+ is bonded in a 2-coordinate geometry to two O2- atoms. There are one shorter (2.27 Å) and one longer (2.28 Å) Hg–O bond lengths. In the second Hg+1.75+ site, Hg+1.75+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.11–2.30 Å. In the third Hg+1.75+ site, Hg+1.75+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Hg–O bond distances ranging from 2.11–2.30 Å. In the fourth Hg+1.75+ site, Hg+1.75+ is bonded in a 2-coordinate geometry to two O2- atoms. There are one shorter (2.27 Å) and one longer (2.28 Å) Hg–O bond lengths. Sb5+ is bonded in an octahedral geometry to six O2- atoms. There are two shorter (1.96 Å) and four longer (2.11 Å) Sb–O bond lengths. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Hg+1.75+ and one Sb5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Hg+1.75+ and one Sb5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Hg+1.75+ and one Sb5+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two Hg+1.75+ and one Sb5+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to two Hg+1.75+ and one Sb5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Hg+1.75+ and one Sb5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba7Hg31 by Materials Project

Ba7Hg31 crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. there are four inequivalent Ba sites. In the first Ba site, Ba is bonded in a 8-coordinate geometry to fourteen Hg atoms. There are a spread of Ba–Hg bond distances ranging from 3.58–3.94 Å. In the second Ba site, Ba is bonded in a 8-coordinate geometry to eight Hg atoms. There are two shorter (3.57 Å) and six longer (3.68 Å) Ba–Hg bond lengths. In the third Ba site, Ba is bonded in a 2-coordinate geometry to sixteen Hg atoms. There are a spread of Ba–Hg bond distances ranging from 3.43–4.16 Å. In the fourth Ba site, Ba is bonded in a 12-coordinate geometry to fifteen Hg atoms. There are a spread of Ba–Hg bond distances ranging from 3.50–3.80 Å. There are seven inequivalent Hg sites. In the first Hg site, Hg is bonded in a 4-coordinate geometry to four Ba and two equivalent Hg atoms. Both Hg–Hg bond lengths are 2.97 Å. In the second Hg site, Hg is bonded in a 6-coordinate geometry to two equivalent Ba and six Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.05–3.32 Å. In the third Hg site, Hg is bonded in a 3-coordinate geometry to three Ba and seven Hg atoms. There are a spread of Hg–Hg bond distances ranging from 3.29–3.38 Å. In the fourth Hg site, Hg is bonded in a body-centered cubic geometry to four Ba and four Hg atoms. There are three shorter (2.97 Å) and one longer (3.01 Å) Hg–Hg bond lengths. In the fifth Hg site, Hg is bonded in a body-centered cubic geometry to four Ba and four Hg atoms. All Hg–Hg bond lengths are 3.04 Å. In the sixth Hg site, Hg is bonded in a 10-coordinate geometry to four Ba and six Hg atoms. In the seventh Hg site, Hg is bonded in a 4-coordinate geometry to three Ba and three Hg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Stannous chloride as a tool for mercury stripping in contaminated streams: Experimental assessment of toxicity in an invertebrate model species

In this work, the chronic toxicity of an innovative Hg water treatment system using tin (Sn) (II) chloride (SnCl 2 ) followed by air stripping was assessed through measurements of survival, growth, and reproduction rate in the freshwater cladoceran Ceriodaphnia dubia, a model species for toxicity testing. We first calculated the concentrations of Hg causing 25% reduction in survival and reproduction (Lethal or Inhibition Concentrations, or LC 25 and IC 25 , for survival and reproduction, respectively) through exposure to aqueous Hg at concentrations ranging from 0 to 25,000 ng L -1 . Then, we treated media (DMW and natural stream water) contaminated with Hg at LC 25 and IC 25 concentrations with SnCl 2 at a Sn:Hg stoichiometric ratio of 8:1 and air stripping and exposed C. dubia to this Sn-amended media. Our results showed that Hg significantly affected survival, reproduction rates and impaired growth. SnCl 2 -treatment removed 100% of the Hg from the media at all concentrations tested with no deleterious effects on survival, growth and reproduction. Our results confirmed the efficacy of SnCl 2 in removing aqueous Hg from stream water and showed that the added Sn did not impact C. dubia at the concentrations tested, supporting the suitability of SnCl 2 -based treatments in appropriate Hg-contaminated environments.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2021

Demethylation or Sorption? The Fate of Methylmercury in the Presence of Manganese Dioxide

Manganese oxide (MnO 2 ) amendments to mercury (Hg)-contaminated sediment have been shown to decrease methylmercury (MeHg) concentrations in sediment porewater. In the absence of solid-phase MeHg measurements, it is unclear whether the decreased porewater concentrations are due to inhibition of methylation, adsorption of the MeHg to the MnO 2 , demethylation of MeHg catalyzed by the MnO 2 , or some combination of these mechanisms. We conducted controlled laboratory experiments to determine whether MeHg losses from solution in the presence of amorphous MnO 2 are due to sorption or demethylation. In this work, we quantified MeHg in the dissolved phase and solid phase and found that no demethylation occurred. We used batch and isotherm experiments to determine MeHg sorption efficiency to MnO 2 in a variety of solutions with varying ionic strength and dissolved organic matter (DOM) concentration. Isotherms over an initial concentration range of 5–500 ng/L of MeHg showed no saturation effects. Increasing ionic strength from 0.012 M to 0.1 M produced relatively minor decreases in MeHg sorption. Increasing DOM concentrations from 0.64 to 16.4 mg C/L yielded substantial decreases in MeHg sorption. Under the experimental conditions, MnO2 is a less efficient MeHg sorbent compared to other sorbent materials, such as Thiol-SAMMS®, activated carbon, and biochar.

42 ENGINEERING↗
DOE OSTI2020

Materials Data on Hg by Materials Project

Hg crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two mercury molecules. Hg is bonded in a 2-coordinate geometry to atoms.

36 MATERIALS SCIENCE↗