Article
Multidisciplinary Sciences
Daniel J. Madigan, Owyn E. Snodgrass, John R. Hyde, Heidi Dewar
Summary: Stable isotope analysis in long-term captive California yellowtail revealed diet-dependent discrimination factors and turnover rates, supporting the isotopic approaches for field data interpretation. Quantifying these factors allows for estimation of diet/habitat shifts and isotopic clock approaches, with observed individual variability highlighting the necessity of large datasets in field studies. Results provide valuable insights for application to stable isotope analysis data in other large teleosts.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Yuxiao Gou, Tomihiko Higuchi, Yuki Iino, Tsuyoshi Nagasaka, Yuichi Shimizu, Kotaro Shirai, Takashi Kitagawa
Summary: This study determined the oxygen isotope fractionation equation for chum salmon and found that both oxygen and carbon isotopes deplete simultaneously in lower temperature settings.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Environmental
Xiao Liu, Langping Wu, Steffen Kuemmel, Hans H. Richnow
Summary: The study demonstrated the biotransformation of α-HCH in wheat using a hydroponic experimental setup. The major metabolite of α-HCH transformation in wheat was identified as 1,3,4,5,6-pentachlorocyclohexene, while no transformation was detected for β-HCH.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Yaqing Liu, Juan Fu, Langping Wu, Steffen Kuemmel, Ivonne Nijenhuis, Hans H. Richnow
Summary: In this study, multi-element compound-specific stable isotope analysis was used to evaluate the α-HCH and γ-HCH transformations catalyzed by LinA1 and LinA2 enzymes. The results showed slight differences in the isotopic fractionation patterns of different enantiomers, but both enzymes exhibited similar reaction mechanisms during γ-HCH transformation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Fisheries
Amanda Fern Ziegler, Bodil A. Bluhm, Paul E. Renaud, Lis L. Jorgensen
Summary: Polar cod is likely to have diet shifts in response to climate change. The study provides the first experimental determination of isotopic turnover and trophic discrimination factors in adult polar cod muscle. The results suggest that sampling at least 60 days apart is recommended to account for isotopic turnover in polar cod muscle.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Engineering, Environmental
Clara Torrento, Violaine Ponsin, Christina Lihl, Thomas B. Hofstetter, Nicole Baran, Martin Elsner, Daniel Hunkeler
Summary: Although multielement isotope fractionation studies have been well-established for point-source pollution, they are only emerging for diffuse pollution by micropollutants like pesticides. This study found that chlorine isotope fractionation can be a robust indicator of chloroacetanilide degradation, with distinct patterns observed for different degradation pathways. The 3D isotope approach allows for differentiation of transformations that may not be distinguishable based on C and N isotope data alone.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Wei Zhang, Guangyi Sun, Runsheng Yin, Xinbin Feng, Zuxiu Yao, Xuewu Fu, Lihai Shang
Summary: The study developed an offline two-round purging-trapping method for separating MeHg from biological samples, which allows for efficient MeHg separation and precise analysis. The method showed high MeHg recoveries with similar accuracy and uncertainty to existing methods.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Biotechnology & Applied Microbiology
Songsong Chen, Limin Ma, Guodong Yao, Yuncai Wang
Summary: This study demonstrated the effectiveness of using a mixed culture of atrazine-degrading bacteria to improve atrazine removal in constructed wetlands. The results showed that atrazine was primarily degraded through a hydrolysis pathway mediated by microorganisms. Stable isotope analysis supported the findings, showing that 90% of atrazine was removed biologically.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2023)
Article
Geochemistry & Geophysics
S. Klemme, F. Genske, P. A. Sossi, J. Berndt, C. J. Renggli, A. Stracke
Summary: The new experimental results reveal fractionation of Cr isotopes during degassing of silicate melts. Lighter isotope Cr-52 is enriched in the gas phase and residual melt becomes enriched in the heavier Cr-53 isotope. This study provides important clues for understanding the recording of chromium isotope loss by evaporation in terrestrial magmas.
Editorial Material
Engineering, Environmental
Alain Manceau
Summary: Some birds and cetaceans can convert toxic methylmercury cysteinate into inert mercury sulfide through the formation of an intermediate selenolate complex. The nucleation of HgSe biominerals involves the substitution of the selenium ligand, which is mediated by proteins. A recent study isolated HgSe nanoparticles from giant petrels and analyzed the isotopic fractionation. The researchers concluded that the HgSe nanoparticles have specific isotopic values and that there is no fractionation of the 202Hg isotope during the reaction. However, a different perspective suggests that the HgSe nanoparticles are mixtures of different substances and that the 202Hg isotope is indeed fractionated during the reaction.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Sheng-Nan Zhang, Yi Gu, Zhen-Li Zhu, Sheng-Hong Hu, Peter M. Kopittke, Fang-Jie Zhao, Peng Wang
Summary: The analysis of Cd isotope ratios in soil, rice grain, and human urine samples from two Cd-contaminated regions in southern China revealed a preferential enrichment of heavy Cd isotopes from soil to rice grain and from grain to urine. The fractionation of Cd isotopes in the soil-rice-human continuum is likely due to processes such as partitioning between the soil solid phase and soil solution, as well as preferential enrichment by metal transporters in humans.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Daniel Bouchard, Patrick Hohener, Didier Gori, Daniel Hunkeler, Tim Buscheck
Summary: Several types of laboratory experiments were conducted to evaluate isotope fractionation caused by phase transfer process for a selection of common environmental contaminants. Carbon and hydrogen isotope fractionation caused by vaporization of non-aqueous phase liquid (NAPL), volatilization from water, and dissolution into an organic solvent (TGDE) were investigated. The results showed significant isotope fractionation during NAPL vaporization and volatilization from water, while no significant fractionation was observed during the air-TGDE partitioning process, except for certain compounds.
Article
Geochemistry & Geophysics
Wenhong Johnson Qiu, Mei-Fu Zhou, Xiaochun Li, Fang Huang, John Malpas
Summary: The study investigates the formation of sediment-hosted stratiform sulfide (SHSS) deposits using Fe, S, and C isotopes. It found that pyrite grains in laminated ores and black shales from the Devonian Dajiangping SHSS-type pyrite deposit in South China exhibit different isotopic compositions, with positive Fe isotopic values in black shales indicating gradual crystallization from sediment-derived iron and negative Fe isotopic values in laminated ores due to kinetic fractionation in hydrothermal plumes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Chemistry, Applied
Hongxia Li, Meijia Wu, Seng She, Guanghui Lin, Jinhui Zhou, Lanzhen Chen
Summary: A new idea and strategy for honey traceability and identification was provided by studying the carbon isotope fractionation of rape honey and its components. The moisture content of rape honey continued to decrease, and the glucose and fructose content continued to increase during the ripening process. The fractionation of carbon isotope from rape flowers to honey was significant, and the delta C-13 of rape honey and its components were mainly related to rape flowers and its stamens.
Article
Engineering, Environmental
Xiao Liu, Wang Li, Steffen Kummel, Ines Merbach, Utkarsh Sood, Vipin Gupta, Rup Lal, Hans H. Richnow
Summary: The study revealed the transformation of beta-HCH in soil-plant systems and indicated that soil microbial community facilitated the conversion of beta-HCH in wheat for the first time. This finding has implications for the development of phytoremediation concepts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)