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At least 865 records · Page 48
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Trace Metal Uptake and Mercury Methylation by Sediments from a Stream in Tennessee

The formation and transport of methylmercury (MeHg), a neurotoxin, in aquatic environments is a global concern for human health as MeHg can bioaccumulate and biomagnify to high concentrations in aquatic food webs. MeHg is formed by conversion from inorganic mercury through microbial mediated methylation. Sulfate-reducing bacteria have been identified as the primary organisms responsible for MeHg production. Pure-culture studies suggest that low availability of cobalt and copper may inhibit mercury methylation, but whether such limitations occur in the environment is unclear. To explore the possible interaction between trace metal availability and mercury methylation, sediments from the East Fork Poplar Creek in Oak Ridge, Tennessee were sampled and then incubated in the presence and absence of added dissolved cobalt and copper. Three types of data are provided in this package. The first reports the uptake of dissolved cobalt and copper by these stream sediments on short time scales (24 hours) in the form of final dissolved and adsorbed concentrations. The second data component consists of a time series of dissolved concentrations and pH values for stream sediments incubated with artificial stream water containing different addition levels of dissolved cobalt or copper. The dissolved concentrations reported include total iron, manganese, sulfur, phosphorus, nickel, zinc and cobalt, dissolved concentrations of sulfate and orthophosphate, and the amount of cobalt or copper adsorbed by the sediment. The third data component reports data at 0 and 72 hours of incubation time for stream sediments to which cobalt was added. These data include concentrations of methylmercury with isotope labeling to enable determination of methylation and demethylation rates as well as dissolved concentrations of sulfate, phosphate, chloride, iron, cobalt, and organic carbon. All data are provided in text-based CSV format with header sections indicating the data contained in each file and the corresponding units. Note that "u" is used in place of Greek lower-case mu to indicate the micro prefix on units. A Table of Contents file (Data_package_TableofContents.txt) provides an index for the data contained in the individual files.

54 ENVIRONMENTAL SCIENCES↗
DOE OSTI2026

Topsoil bulk geochemical compositions - An updated harmonized global dataset

Mineral weathering is a key biogeochemical process because of the capacity of minerals to stabilize organic matter. However, predicting soil weathering status across large spatial areas still isn’t possible due to a lack of global data and theoretical frameworks. To address this knowledge gap, multiple global datasets of bulk topsoil geochemical compositions have been harmonized using R. These datasets document topsoil bulk geochemical compositions across five continents (n = ~16,000 observations). Source data for these observations include the EuroGEOSurveys Geochemical Baseline Database (FOREGS), the US Geological Survey National Geochemical Database (NASGLP), the Geochemical Atlas of Australia (GAA), the US Geological Survey Alaska Geochemical Database (AGD84), the National Cooperative Soil Survey (NCSS), the European Geochemical Mapping of Agricultural Soil (GEMAS), Ecorespira-Amazon (ERA), the New Zealand Geochemical Baseline Survey (NZ_GBS), and the African Soil Information Service (AFSIS). Major elements observed include Aluminum (Al), Calcium (Ca), Iron (Fe), Potassium (K), Magnesium (Mg), Sodium (Na), Titanium (Ti), Manganese (Mn), Phosphorus (P), Carbon (C), and Sulfur (S). This data package includes the harmonized dataset itself, and the R scripts necessary to harmonize these datasets, in addition to metadata that describes all columns, files, and databases used in this project. Methods & Sampling Step 1 – Databases of geochemical data identified This study aimed to leverage existing measurements of topsoil geochemical data. Databases were first identified and deemed appropriate for inclusion if they were measuring soils and performed these measurements on the <2mm soil fraction. Databases such as NCSS and AGD84 needed more post processing to include in the database and this was done using the NCSS_datamerge_031626 R file and Alaska_USGSmerge_031626 R file, respectively. Step 2 – Database harmonization Once appropriate databases were identified, they were harmonized for ease of analysis using the R script Database_Harmonization_031826. This included removing columns from original datasets that would not be used in analysis (removed columns are noted in the code). Then, data cleaning procedures specific to each dataset were undertaken. This includes standardizing columns to include units and adding metadata columns regarding procedures for analyzing specific elements. Functions for standardizing measurements and units are outline in R files: calculate element_mg_kg_031626, calculate_oxide_wt_perc_031626, change_oxide_caps_031626, and conv_2_numeric_031626. This also included adding a unique identifier for each sample to identify it with its respective database (see CD_ID in data dictionary). Geographic information: Data reflect a compilation of datasets collected globally. Geographic areas covered by each of the datasets include: - EuroGEOSurveys Geochemical Baseline Database (FOREGS) - European continent - North American Soil Geochemical Landscapes (NASGLP) - continental United States and limited parts of Canada (see database key for more details) - National Geochemical Survey of Australia (GAA) - Australia - Alaska geochemical database (AGDB4) - Alaska - National Cooperative Soil Survey (NCSS) - Global measurements, but concentrated in the continental United States - Geochemical data for arable land and land under permanent grass cover in continental Europe (GEMAS) - continental Europe - Ecorespira-Amazon (ERA) - Geochemical data from the Amazon basin - Geochemical baseline data for New Zealand (NZGBS) - New Zealand - Geochemical data collected across continental Africa (AfSIS) - Measurements across Africa

EARTH SCIENCE > LAND SURFACE > SOILS↗
DOE OSTI2020

Materials Data on Cs2NaMn(CN)6 by Materials Project

Cs2Na(CN)6Mn crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two manganese molecules and one Cs2Na(CN)6 framework. In the Cs2Na(CN)6 framework, Cs1+ is bonded in a 4-coordinate geometry to eight N3- atoms. There are a spread of Cs–N bond distances ranging from 3.31–3.83 Å. Na1+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of Na–N bond distances ranging from 2.51–2.55 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a distorted bent 150 degrees geometry to two equivalent Cs1+, one Na1+, and one C2+ atom. In the second N3- site, N3- is bonded in a 2-coordinate geometry to three equivalent Cs1+, one Na1+, and one C2+ atom. In the third N3- site, N3- is bonded in a distorted bent 150 degrees geometry to three equivalent Cs1+, one Na1+, and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnNiAs by Materials Project

MnNiAs is half-Heusler structured and crystallizes in the cubic F-43m space group. The structure is zero-dimensional and consists of four arsenic molecules, four manganese molecules, and four nickel molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnH8(BrO2)2 by Materials Project

MnH8(O2Br)2 is alpha U structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four manganese(ii) bromide tetrahydrate molecules. Mn2+ is bonded in an octahedral geometry to four O2- and two Br1- atoms. There are a spread of Mn–O bond distances ranging from 2.19–2.29 Å. There are one shorter (2.66 Å) and one longer (2.70 Å) Mn–Br bond lengths. There are eight inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to one Mn2+ and two H1+ atoms. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Mn2+ and two H1+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Mn2+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to one Mn2+ and two H1+ atoms. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one Mn2+ atom. In the second Br1- site, Br1- is bonded in a single-bond geometry to one Mn2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3Mn(CN)6 by Materials Project

K3Mn(CN)6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two manganese molecules and one K(CN)2 framework. In the K(CN)2 framework, there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of K–N bond distances ranging from 2.86–3.02 Å. In the second K1+ site, K1+ is bonded in a 6-coordinate geometry to six N3- atoms. There are a spread of K–N bond distances ranging from 2.87–3.30 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 4-coordinate geometry to three K1+ and one C2+ atom. In the second N3- site, N3- is bonded in a distorted single-bond geometry to three K1+ and one C2+ atom. In the third N3- site, N3- is bonded in a 1-coordinate geometry to three K1+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2KMn(CN)6 by Materials Project

Cs2K(CN)6Mn crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of two manganese molecules and one Cs2K(CN)6 framework. In the Cs2K(CN)6 framework, Cs1+ is bonded in a 4-coordinate geometry to seven N3- atoms. There are a spread of Cs–N bond distances ranging from 3.21–3.85 Å. K1+ is bonded in an octahedral geometry to six N3- atoms. There are a spread of K–N bond distances ranging from 2.78–2.82 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. In the third C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Cs1+, one K1+, and one C2+ atom. In the second N3- site, N3- is bonded in a 1-coordinate geometry to two equivalent Cs1+, one K1+, and one C2+ atom. In the third N3- site, N3- is bonded in a 1-coordinate geometry to three equivalent Cs1+, one K1+, and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KMn4O8 by Materials Project

KMn4O8 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of two manganese hydroxide (mn(oh)2) molecules and one KMn2O4 sheet oriented in the (0, -1, 1) direction. In the KMn2O4 sheet, K1+ is bonded in a 2-coordinate geometry to four O2- atoms. There are two shorter (2.48 Å) and two longer (2.97 Å) K–O bond lengths. There are two inequivalent Mn+3.75+ sites. In the first Mn+3.75+ site, Mn+3.75+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Mn–O bond lengths are 1.43 Å. In the second Mn+3.75+ site, Mn+3.75+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Mn–O bond lengths are 1.57 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one K1+ and one Mn+3.75+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one K1+ and one Mn+3.75+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2LiMn(CN)6 by Materials Project

Cs2Li(CN)6Mn crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four manganese molecules and one Cs2Li(CN)6 framework. In the Cs2Li(CN)6 framework, Cs1+ is bonded to twelve equivalent N3- atoms to form distorted CsN12 cuboctahedra that share corners with twelve equivalent CsN12 cuboctahedra, faces with six equivalent CsN12 cuboctahedra, and faces with four equivalent LiN6 octahedra. All Cs–N bond lengths are 3.82 Å. Li1+ is bonded to six equivalent N3- atoms to form LiN6 octahedra that share faces with eight equivalent CsN12 cuboctahedra. All Li–N bond lengths are 2.23 Å. C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.18 Å. N3- is bonded in a linear geometry to four equivalent Cs1+, one Li1+, and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn3H24(O3F2)4 by Materials Project

Mn(H2O)6(MnH4(OF2)2)2(H2O)2 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one manganese hexahydrate molecule, two water molecules, and two MnH4(OF2)2 clusters. In each MnH4(OF2)2 cluster, Mn+2.67+ is bonded in an octahedral geometry to two O2- and four F1- atoms. There are one shorter (2.21 Å) and one longer (2.33 Å) Mn–O bond lengths. There are a spread of Mn–F bond distances ranging from 1.88–1.91 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to one Mn+2.67+ and two H1+ atoms. In the second O2- site, O2- is bonded in a distorted water-like geometry to one Mn+2.67+ and two H1+ atoms. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to one Mn+2.67+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Mn+2.67+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one Mn+2.67+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Mn+2.67+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnF4 by Materials Project

MnF4 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of two manganese, tetrafluoro- molecules. Mn4+ is bonded in a square co-planar geometry to four F1- atoms. There is three shorter (1.78 Å) and one longer (1.79 Å) Mn–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Mn4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Mn4+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Mn4+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Mn4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th6Mn23H44 by Materials Project

Mn(Th3(MnH2)11)2 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four manganese molecules and one Th3(MnH2)11 framework. In the Th3(MnH2)11 framework, Th is bonded in a 8-coordinate geometry to sixteen H atoms. There are a spread of Th–H bond distances ranging from 2.27–2.72 Å. There are three inequivalent Mn sites. In the first Mn site, Mn is bonded in a 3-coordinate geometry to three equivalent H atoms. All Mn–H bond lengths are 1.67 Å. In the second Mn site, Mn is bonded in an octahedral geometry to six H atoms. There is four shorter (1.68 Å) and two longer (1.78 Å) Mn–H bond length. In the third Mn site, Mn is bonded in a trigonal non-coplanar geometry to three equivalent H atoms. All Mn–H bond lengths are 1.80 Å. There are three inequivalent H sites. In the first H site, H is bonded in a distorted water-like geometry to two equivalent Th and two Mn atoms. In the second H site, H is bonded in a 5-coordinate geometry to two equivalent Th and three Mn atoms. In the third H site, H is bonded in a trigonal planar geometry to three equivalent Th atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnAgF3 by Materials Project

MnAgF3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one manganese molecule and one AgF3 framework. In the AgF3 framework, Ag1+ is bonded to six equivalent F1- atoms to form corner-sharing AgF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ag–F bond lengths are 2.20 Å. F1- is bonded in a linear geometry to two equivalent Ag1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnSO6 by Materials Project

MnO3SO3 is Ammonia-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four dihydroxy(oxo)manganese molecules and four sulfur trioxide molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnTc2Sb by Materials Project

MnTc2Sb is Cyanogen Chloride-like structured and crystallizes in the orthorhombic Immm space group. The structure is zero-dimensional and consists of two manganese molecules and two Tc2Sb clusters. In each Tc2Sb cluster, Tc+0.50+ is bonded in a single-bond geometry to one Sb3- atom. The Tc–Sb bond length is 2.52 Å. Sb3- is bonded in a linear geometry to two equivalent Tc+0.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm10Mn13C18 by Materials Project

(Tm5(Mn2C3)3)2Mn crystallizes in the cubic I-43m space group. The structure is three-dimensional and consists of two manganese molecules and one Tm5(Mn2C3)3 framework. In the Tm5(Mn2C3)3 framework, there are two inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded to eight C+3.11- atoms to form distorted TmC8 hexagonal bipyramids that share edges with two equivalent TmC8 hexagonal bipyramids, edges with four equivalent TmC6 pentagonal pyramids, and faces with four equivalent TmC8 hexagonal bipyramids. There are four shorter (2.43 Å) and four longer (2.59 Å) Tm–C bond lengths. In the second Tm3+ site, Tm3+ is bonded to six equivalent C+3.11- atoms to form distorted TmC6 pentagonal pyramids that share corners with six equivalent TmC6 pentagonal pyramids and edges with six equivalent TmC8 hexagonal bipyramids. There are three shorter (2.55 Å) and three longer (2.61 Å) Tm–C bond lengths. Mn2+ is bonded in a distorted trigonal non-coplanar geometry to three C+3.11- atoms. There is two shorter (1.86 Å) and one longer (2.05 Å) Mn–C bond length. There are two inequivalent C+3.11- sites. In the first C+3.11- site, C+3.11- is bonded to four Tm3+ and two equivalent Mn2+ atoms to form a mixture of distorted edge and corner-sharing CTm4Mn2 octahedra. The corner-sharing octahedra tilt angles range from 5–68°. In the second C+3.11- site, C+3.11- is bonded in a 7-coordinate geometry to four equivalent Tm3+, two equivalent Mn2+, and one C+3.11- atom. The C–C bond length is 1.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnO2 by Materials Project

MnO2 is Cyanogen Chloride-derived structured and crystallizes in the orthorhombic Fdd2 space group. The structure is zero-dimensional and consists of eight manganese hydroxide (mn(oh)2) molecules. Mn4+ is bonded in a linear geometry to two equivalent O2- atoms. Both Mn–O bond lengths are 1.68 Å. O2- is bonded in a single-bond geometry to one Mn4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MnSiNi2 by Materials Project

Ni2MnSi crystallizes in the tetragonal P4/mmm space group. The structure is two-dimensional and consists of one manganese molecule and one Ni2Si sheet oriented in the (0, 0, 1) direction. In the Ni2Si sheet, Ni1+ is bonded in a 4-coordinate geometry to four equivalent Si4- atoms. All Ni–Si bond lengths are 2.37 Å. Si4- is bonded in a body-centered cubic geometry to eight equivalent Ni1+ atoms.

36 MATERIALS SCIENCE↗