Zobrazeno 1 - 10
of 139
pro vyhledávání: '"John Karl Böhlke"'
Autor:
Baohua Gu, Paul B. Hatzinger, W. Andrew Jackson, John Karl Böhlke, Stanley J. Mroczkowski, Neil C. Sturchio, Balaji Rao, Nubia Estrada, Todd A. Anderson
Publikováno v:
Geochimica et Cosmochimica Acta. 311:292-315
Natural perchlorate (ClO4−) exists in many places on Earth, in lunar regolith, meteorites, and on the surface of Mars. Terrestrial natural ClO4− has widely variable Cl and O stable isotopic compositions (δ37Cl, δ18O, Δ17O). The δ18O and Δ17O
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::583892ea5191768f47e45671ae66ab86
https://doi.org/10.1016/j.gca.2021.06.039
https://doi.org/10.1016/j.gca.2021.06.039
Autor:
Cajetan Neubauer, Kyle L. Fort, Stanley J. Mroczkowski, Xingchen T. Wang, Andreas Hilkert, Konstantin Aizikov, John Karl Böhlke, Sebastian H. Kopf
Publikováno v:
Analytical chemistry. 93(26)
Widely used isotope ratio mass spectrometers have limited capabilities to measure metabolites, drugs, or small polyatomic ions without the loss of structural isotopic information. A new approach has recently been introduced that uses electrospray ion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b003532aa5af690a649b778c051700f
https://pubmed.ncbi.nlm.nih.gov/34165950
https://pubmed.ncbi.nlm.nih.gov/34165950
Publikováno v:
Journal of Hydrology. 568:849-861
To improve understanding of spatial, seasonal, and inter-annual variations in nitrate sources and in-stream processes in the Illinois River system, nitrate concentrations and isotopic compositions were measured in 445 water samples collected over a f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c02bc94508478743a7e52c355bacadb
https://doi.org/10.1016/j.jhydrol.2018.11.043
https://doi.org/10.1016/j.jhydrol.2018.11.043
Autor:
Penny Vlahos, Richard W. Smith, John Karl Böhlke, Christopher Cooper, Thomas J. Groshens, Craig R. Tobias, Mark Ballentine, Stephen Fallis, Thivanka Ariyarathna
Publikováno v:
Science of The Total Environment. 647:369-378
Coastal marine habitats become contaminated with the munitions constituent, Hexahydro-1,3,5-trinitro-1,3,5-trazine (RDX), via military training, weapon testing and leakage of unexploded ordnance. This study used 15N labeled RDX in simulated aquarium-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eed1903fd7cc1de1c1f91a1063147232
https://doi.org/10.1016/j.scitotenv.2018.07.404
https://doi.org/10.1016/j.scitotenv.2018.07.404
Autor:
Dorothy H. Tepper, John Karl Böhlke, Peter G. Mahaffy, Glenda O’Connor, Michael E. Wieser, Norman E. Holden, Lauren V. Tarbox, John R. de Laeter, Jacqueline Benefield, Thomas Walczyk, Tyler B. Coplen, E. Roth, Shigekazu Yoneda
Publikováno v:
Pure and Applied Chemistry. 90:1833-2092
The IUPAC (International Union of Pure and Applied Chemistry) Periodic Table of the Elements and Isotopes (IPTEI) was created to familiarize students, teachers, and non-professionals with the existence and importance of isotopes of the chemical eleme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6be14da286ea27b932964c1636c428df
https://doi.org/10.1515/pac-2015-0703
https://doi.org/10.1515/pac-2015-0703
Publikováno v:
Goldschmidt2021 abstracts.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdb7c991f6ffe0c64cdc22476fafed8e
https://doi.org/10.7185/gold2021.6483
https://doi.org/10.7185/gold2021.6483
In this study, we explored the use of statistical machine learning and long-term groundwater nitrate monitoring data to estimate vadose-zone and saturated-zone lag times in an irrigated alluvial agricultural setting. Unlike most previous statistical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ef0db3dd05ce9cac7aa61cd0398f797d
https://doi.org/10.5194/hess-2020-169
https://doi.org/10.5194/hess-2020-169
Publikováno v:
Rapid Communications in Mass Spectrometry. 34
Rationale The isotope ratios of nitrogen (15 N/14 N) and oxygen (18 O/16 O) in nitrite (NO2 - ) can be measured by conversion of the nitrite into nitrous oxide (N2 O) with azide, followed by mass spectrometric analysis of N2 O by gas chromatography i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d5e59b09aa83f16385dfa6cfe083ca1
https://doi.org/10.1002/rcm.8569
https://doi.org/10.1002/rcm.8569
Autor:
Andrew G. Hunt, Bryant C. Jurgens, Jeffrey A. Hansen, John Karl Böhlke, Eurybiades Busenberg, Karl B. Haase
Publikováno v:
Techniques and Methods.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0abe7b14441007c9084fb0afc89c644e
https://doi.org/10.3133/tm4f5
https://doi.org/10.3133/tm4f5