Article
Engineering, Environmental
Ning Min, Jun Yao, Meseret Amde, Cengceng Tang, Langping Wu, Hans Hermann Richnow, Yafei Chen, Yongqiang Cui, Hao Li
Summary: Compound-specific isotope analysis (CSIA) has been used to investigate the degradation mechanisms of p-chloroaniline (PCA) under different pH conditions induced by persulfate (PS). Results showed that the degradation of PCA followed first-order kinetics, with different degradation rates and carbon isotope fractionation observed at different pH values. The study provides insights into the degradation pathways of PCA with SO4 center dot- and center dot OH in aqueous systems.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Civil
Elizabeth Phillips, Bridget A. Bergquist, Michelle M. G. Chartrand, Weibin Chen, Elizabeth A. Edwards, Martin Elsner, Tetyana Gilevska, Sarah Hirschorn, Axel Horst, Georges Lacrampe-Couloume, Silvia A. Mancini, Jennifer McKelvie, Penny L. Morrill, Ann Sullivan Ojeda, Gregory F. Slater, Brent E. Sleep, Joan De Vera, Oliver Warr, Elodie Passeport
Summary: Professor Barbara Sherwood Lollar's contributions to Compound Specific Isotope Analysis (CSIA) in contaminant hydrogeology and environmental chemistry are focused on establishing CSIA as a quantitative tool for (bio) transformation at contaminated groundwater sites and developing best practices for industry application to demonstrate occurrence, identify mechanisms, quantify extent, and differentiate sources. Her research also includes applications of CSIA to hydrogeology of the deep subsurface and expanding to new environments, contaminants, and systems.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Ning Min, Jun Yao, Meseret Amde, Hao Li, Wancheng Pang, Junjie Zhu, Ying Cao, Hans Hermann Richnow
Summary: Compound-specific isotope analysis (CSIA) was used to investigate the degradation mechanism of nano titanium dioxide (TiO2) in the photodegradation of diethyl phthalate (DEP). The study revealed that the degradation of DEP follows first-order kinetics, with a higher degradation rate at neutral conditions. The 13C and 2H isotope fractionation indicated that the addition of & BULL;OH on the benzene ring of DEP is the main conversion pathway. Additionally, hydroxyl radicals were identified as the dominant radical species in the studied systems.
Article
Engineering, Environmental
Muhammad Aamir, Zili Guo, Jiawei Yu, Lu Zhao, Dongmei Xu, Xiaohui Sun, Chao Xu, Lili Niu, Weiping Liu
Summary: This study investigates the behavior and fate of organic pollutants in paddy fields in China using soil samples and analytical techniques. The results show that various factors such as altitude, soil temperature, and pH significantly influence the transformation of these pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Chemical
Songsong Chen, Yuncai Wang, Limin Ma
Summary: This study investigates the carbon and nitrogen isotope fractionation characteristics during the degradation of atrazine in a constructed wetland. The observed isotope parameters are consistent with those observed in the cultivation of specific strains, indicating similarities in the biodegradation pathway and mechanism. However, variations in carbon and nitrogen isotope fractionation across different phases may lead to over- or underestimation of atrazine biodegradation extent. The accuracy of estimation improves when using the enrichment factor derived from batch cultivation of pore water. This study advances the application of compound-specific stable isotope analysis in tracking atrazine biodegradation in ecosystems, emphasizing the importance of carefully selecting and applying the enrichment factor for quantifying intrinsic biodegradation.
Article
Environmental Sciences
Tetyana Gilevska, Sylvain Payraudeau, Gwenael Imfeld
Summary: This study focuses on using compound-specific isotope analysis (CSIA) to estimate pesticide degradation in a stormwater wetland. The results show that one specific isomer of the fungicide dimethomorph exhibited significant carbon isotopic composition change in the wetland, indicating degradation. Laboratory experiments revealed that degradation mainly occurred in the wetland sediments. Overall, CSIA offers a reliable alternative to traditional mass balance approaches for evaluating pesticide degradation in wetland systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yota Harada, Shin-ichi Ito, Nanako O. Ogawa, Chisato Yoshikawa, Naoto F. Ishikawa, Michio Yoneda, Naohiko Ohkouchi
Summary: Fish migration plays a crucial role in marine conservation and fisheries management, but patterns are changing due to ocean conditions. A new method using isotopes in fish eye lenses can reconstruct geographic and trophic histories. This study analyzed the nitrogen isotope ratios of amino acids in chub mackerel eye lenses to distinguish migration and trophic changes.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Chong Chen, Jiahong Luo, Weiwei Zhang, Chengcheng Bu, Limin Ma
Summary: The study investigated the degradation process of chlorpyrifos in an integrated constructed wetland using carbon isotope analysis and 16S rDNA sequencing. The results showed the removal efficiency at different time points, carbon isotope fractionation, and microbial community composition and spatial distribution differences.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jian Shi, Zheng Zhang, Ruilu Yang
Summary: Compound-Specific Isotope Analysis (CSIA) is a useful tool for studying the biodegradation of metalaxyl in soil and plants. Microbial degradation was found to have the most significant impact on the degradation of metalaxyl in soil. CSIA was used to investigate the biodegradation and isotope fractionation of metalaxyl in water spinach, showing that both absorption and degradation processes can cause shifts in delta C-13 values. Additionally, the relationship between carbon isotope ratios and residual concentration of metalaxyl was described by the Rayleigh equation, allowing for the calculation of the biodegradation rate of metalaxyl using CSIA.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Agriculture, Multidisciplinary
Paula Perez-Rodriguez, Anne-Desiree Schmitt, Sophie Gangloff, Jeremy Masbou, Gwenael Imfeld
Summary: The study found that leaching, dissipation, and degradation of pesticides in different types of soil mesocosms can be influenced by the planted or unplanted conditions, with planted mesocosms favoring pesticide degradation. Compound-specific stable isotope analysis showed that biodegradation of pesticides in soil-plant systems mainly occurred in the soil solution leached after rainfall events.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2021)
Article
Environmental Sciences
Silviu-Laurentiu Badea, Violeta -Carolina Niculescu, Diana-Ionela Popescu (Stegarus), Elisabeta-Irina Geana, Corina-Teodora Ciucure, Oana-Romina Botoran, Roxana-Elena Ionete
Summary: Compound specific isotope analysis has been extensively used to study the environmental processes associated with the transformation of persistent halogenated organic pollutants. Recent advancements have expanded its application to larger molecules and multi-element analysis. However, the instrumental detection limit remains challenging, especially for δ13C analysis, and liquid chromatography-combustion isotope ratio mass spectrometry methods face difficulties in complex mixture analysis. Alternative approaches, such as enantioselective stable isotope analysis, have been explored for chiral contaminants, but more research is needed. In order to analyze new emerging halogenated organic contaminants, there is a need to develop new GC and LC methods for non-target screening using high resolution mass spectrometry prior to compound specific isotope analysis (CSIA) methods.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Lan-tian Xing, Zhong-ping Li, Li Xu, Li-wu Li, Yan Liu
Summary: This study presents and tests an easy-to-use and efficient approach for the catalytic pyrolysis of hydrocarbon gas, which allows for precise measurement of hydrogen isotopes. The proposed method significantly reduces the pyrolysis temperature and improves the analytical precision, resulting in an extended lifespan of the catalytic furnace.
Article
Engineering, Environmental
Guoguang Wang, Na Jiang, Yu Liu, Xu Wang, Yuxin Liu, Dian Jiao, Haixia Wang
Summary: This study revealed the interaction between BDE-47 and BDE-153 in wetland sediments, indicating potential mutual inhibition and competition in co-exposure conditions. The results suggest the importance of considering microbial degradation competition among PBDEs for comprehensive risk assessment in environments with simultaneous exposure to multiple PBDE congeners.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
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
Engineering, Environmental
Shaochen Yang, Bo Wang, Chongyang Qin, Runsheng Yin, Ping Li, Jinling Liu, David Point, Laurence Maurice, Jeroen E. Sonke, Leiming Zhang, Xinbin Feng
Summary: The study utilized MMHg-CSIA to quantify human MMHg sources and found that human exposure to MMHg was primarily from fishery foods, with less impact from rice consumption.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Christin Mueller, Kay Knoeller, Rico Lucas, Sabine Kleinsteuber, Ralf Trabitzsch, Holger Weiss, Reiner Stollberg, Hans Hermann Richnow, Carsten Vogt
Summary: The study aimed to stimulate benzene biodegradation by injecting nitrate, which resulted in changing redox conditions and recycling of sulphate in the sulphidic, sulphate-depleted benzene plume due to microbial oxidation of reduced sulphur species. This created more favorable conditions for in situ benzene biodegradation.
JOURNAL OF CONTAMINANT HYDROLOGY
(2021)
Article
Environmental Sciences
Monika Sharma, Durgesh Narain Singh, Rohit Budhraja, Utkarsh Sood, Charu Dogra Rawat, Lorenz Adrian, Hans-Hermann Richnow, Yogendra Singh, Ram Krishan Negi, Rup Lal
Summary: This study investigates the response of Sphingobium indicum B90A strain to HCH isomers using proteomics approach. The results show that beta- and delta-HCH induced significant systemic changes in the proteome of strain B90A, affecting stress-alleviating proteins.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Review
Geosciences, Multidisciplinary
S. Peiffer, A. Kappler, S. B. Haderlein, C. Schmidt, J. M. Byrne, S. Kleindienst, C. Vogt, H. H. Richnow, M. Obst, L. T. Angenent, C. Bryce, C. McCammon, B. Planer-Friedrich
Summary: Highly redox-active compounds play a crucial role in biogeochemical element cycles in aquatic systems subjected to frequent hydrological disturbances. These metastable substances require activation through fluctuating redox conditions to maintain their high reactivity.
Article
Microbiology
Marc Tamisier, Matthias Schmidt, Carsten Vogt, Steffen Kuemmel, Hryhoriy Stryhanyuk, Niculina Musat, Hans-Hermann Richnow, Florin Musat
Summary: The research focused on the stable carbon and hydrogen isotope effects associated with methane formation by the corrosive archaeon Methanobacterium strain IM1 during growth with hydrogen and iron. The growth resulted in methane with depleted C-13 values, while H-2 values were less impacted by growth phase. The corrosion crusts formed were composed of siderite, calcite, and iron sulfide, with attached cells found on crust surfaces and deep inside crust domes.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Microbiology
Mohammad S. Bin Hudari, Carsten Vogt, Hans H. Richnow
Summary: High-temperature aquifer thermal energy storage (HT-ATES) affects the structure and activities of indigenous aquifer microbial communities, with acetate mineralization inhibited at lower and higher temperatures. Microbial communities adapted to 45 degrees Celsius were found to be resilient to temporary heat changes and mainly consisted of organisms adapted to temperatures between mesophiles and thermophiles.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Samuel C. Eziuzor, Felipe B. Correa, Shuchan Peng, Junia Schultz, Sabine Kleinsteuber, Ulisses N. da Rocha, Lorenz Adrian, Carsten Vogt
Summary: This study investigated the metabolism of benzene by microbes under anoxic conditions. The results showed that benzene mineralization was correlated with the enrichment of a particular Peptococcaceae phylotype, and observed a slight increase in other abundant taxa. Despite benzene being the sole organic carbon source, the microbial community remained diverse, suggesting complex interactions between different functional groups.
JOURNAL OF APPLIED MICROBIOLOGY
(2022)
Article
Microbiology
Washington Logrono, Marcell Nikolausz, Hauke Harms, Sabine Kleinsteuber
Summary: The effect of the inhibitor BES on hydrogenotrophic metabolism in biomethanation was investigated. Anaerobic granules produced the highest amount of formate in the presence of BES, while the non-inhibited methanogenic communities produced small amounts of formate.
Article
Microbiology
Bi-Jing Xiong, Sabine Kleinsteuber, Heike Strauber, Christian Dusny, Hauke Harms, Lukas Y. Wick
Summary: This study demonstrates the presence and persistence of oxygen-free zones in air-exposed mycelia, facilitating the activity and dispersal of obligate anaerobes. Fungal oxygen consumption's effects on bacterial-fungal interactions need further investigation.
Article
Chemistry, Multidisciplinary
Flavio C. F. Baleeiro, Sabine Kleinsteuber, Heike Straeuber
Summary: Anaerobic fermentation with mixed cultures is a promising bioprocess for producing platform carboxylates from low-value biomass feedstocks. However, the carbon emissions and limited carboxylate yields are major disadvantages. In this study, researchers successfully operated bioreactors fed with acetate and lactate, using a new approach to stimulate autotrophic activity and inhibit methanogenesis. The results showed increased selectivity to medium-chain carboxylates and the development of a carbon-fixing chain elongation process, demonstrating the potential of this method.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Microbiology
Martin Bachmann, Monika Wensch-Dorendorf, Christian Kuhnitzsch, Sabine Kleinsteuber, Denny Popp, Annabel Thierbach, Siriwan D. Martens, Olaf Steinhoefel, Annette Zeyner
Summary: The present study investigates the impact of various factors on epiphytic microbial communities in field peas and identifies suitable combinations for stable silage production. It analyzes the composition and diversity of these microbial communities at different stages of maturity, before and after ensiling, and with or without the use of lactic acid bacteria (LAB) as inoculant. The study also evaluates the quality of the silages and suggests that certain maturity stages and LAB inoculation can improve the stability and quality of pea seed silages.
MICROBIOLOGY SPECTRUM
(2022)
Article
Biotechnology & Applied Microbiology
Flavio C. F. Baleeiro, Jana Raab, Sabine Kleinsteuber, Anke Neumann, Heike Straeuber
Summary: Feeding microbial communities with both organic and inorganic substrates can improve sustainability and feasibility of chain elongation processes, leading to improved production efficiency.
MICROBIAL BIOTECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Washington Logrono, Paul Kluge, Sabine Kleinsteuber, Hauke Harms, Marcell Nikolausz
Summary: The diversity of the inoculum significantly influences methane production and process stability, with higher diversity cultures producing more methane and accumulating fewer volatile fatty acids.
BIOENGINEERING-BASEL
(2022)
Article
Engineering, Environmental
Bin Liu, Heike Straeuber, Florian Centler, Hauke Harms, Ulisses Nunes da Rocha, Sabine Kleinsteuber
Summary: The effects of pH alterations on microbial chain elongation in anaerobic mixed cultures were investigated. The community composition shifted dramatically when the pH increased from 5.5 to 6.5, but the product range and yields returned to previous states after transient fluctuations. The study highlights the importance of pH in shaping the abundance of key players and community functioning in microbial chain elongation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Microbiology
Daniela Becker, Denny Popp, Fabian Bonk, Sabine Kleinsteuber, Hauke Harms, Florian Centler
Summary: Analyzing microbial communities using metagenomes is a powerful approach to understand compositional structures and functional connections in anaerobic digestion (AD) microbiomes. The hybrid sequencing approach of combining short-read and long-read sequencing provides better assembly statistics and generates more high-quality metagenome-assembled genomes (MAGs). It is the preferable option for dealing with complex microbiomes.
Article
Environmental Sciences
Natalia Malina, Xi Wei, Steffem Kummel, Hans H. Richnow, Carsten Vogt
Summary: This study developed and validated a method based on gas chromatography-isotope ratio mass spectrometry for analyzing the hydrogen and carbon isotope ratios of phenolic compounds, aiming to study their sources and degradation pathways in the environment. Results showed that the variation in hydrogen and carbon isotope ratios can indicate different enzymatic reactions, helping distinguish the mechanisms of different microbes in the degradation process.