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Fulvic acid

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https://www.readbyqxmd.com/read/29153878/extensive-processing-of-sediment-pore-water-dissolved-organic-matter-during-anoxic-incubation-as-observed-by-high-field-mass-spectrometry-fticr-ms
#1
Juliana Valle, Michael Gonsior, Mourad Harir, Alex Enrich-Prast, Philippe Schmitt-Kopplin, David Bastviken, Ralf Conrad, Norbert Hertkorn
Dissolved organic matter (DOM) contained in lake sediments is a carbon source for many microbial degradation processes, including aerobic and anaerobic mineralization. During anaerobic degradation, DOM is partially consumed and transformed into new molecules while the greenhouse gases methane (CH4) and carbon dioxide (CO2) are produced. In this study, we used ultrahigh resolution mass spectrometry to trace differences in the composition of solid-phase extractable (PPL resin) pore water DOM (SPE-DOM) isolated from surface sediments of three boreal lakes before and after 40 days of anoxic incubation, with concomitant determination of CH4 and CO2 evolution...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29153876/real-time-evaluation-of-natural-organic-matter-deposition-processes-onto-model-environmental-surfaces
#2
Wenlu Li, Peng Liao, Trey Oldham, Yi Jiang, Chao Pan, Songhu Yuan, John D Fortner
Natural organic matter (NOM) is ubiquitous in aqueous systems and dynamically partitions onto/from environmental surfaces. However, such interfacial processes have not been uniformly quantified in situ and in real time. In this work, adsorption and deposition processes of Suwannee River humic acid (SRHA) and Suwannee River fulvic acid (SRFA), as model NOM, were evaluated for a series of environmentally relevant interfaces. Real-time, interfacial phenomenon, including deposition, release, and adlayer viscoelastic properties, were quantified over a variety of water chemistries via quartz crystal microbalance with dissipation monitoring (QCM-D)...
November 9, 2017: Water Research
https://www.readbyqxmd.com/read/29151190/elucidation-of-functional-chemical-groups-responsible-of-compost-phytotoxicity-using-solid-state-13-c-nmr-spectroscopy-under-different-initial-c-n-ratios
#3
Khalid Azim, Youssef Faissal, Brahim Soudi, Claude Perissol, Sevastianos Roussos, Imane Thami Alami
More than 1 million tons of fresh organic wastes is produced in the Souss-Massa region in Morocco. Tomato organic residues represent more than 25% of the total organic wastes and are deposited in uncontrolled landfills. Thus, composting can represent a valuable and pertinent solution to this environmental problem. The objectives of this experiment are to identify the potential functional groups responsible for compost phytotoxicity and to determine the optimum initial carbon to nitrogen ratio (C/N) for maximum recovery of tomato residues...
November 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29149172/spectroscopic-characterization-of-dom-and-the-nitrogen-removal-mechanism-during-wastewater-reclamation-plant
#4
Lei Wang, Ying-Jun Li, Ying Xiong, Wen-Bing Tan, Lie-Yu Zhang, Xiang Li, Xiao-Shu Wang, Jian-Feng Xu, Tong-Tong Li, Jin-Sheng Wang, Ming-Xuan Cai, Bei-Dou Xi, Di-Hua Wang
The performance of the Sha-he wastewater reclamation plant was evaluated in this study. To remove residual nitrogen after Anaerobic-Anoxic-Oxic (A2O) treatment, three multistage Anoxic-Oxic (A/O) were added to investigate the nitrogen removal efficiency and its mechanism. In addition, the constituents and evolution of dissolved organic matter (DOM) during wastewater reclamation was also investigated using a method combining fluorescence spectroscopy with fluorescence regional integration (FRI). The results suggested that multistage A/O treatment can effectively improve the nitrogen removal ability under low concentrations of carbon sources...
2017: PloS One
https://www.readbyqxmd.com/read/29143257/environmental-characteristics-and-changes-of-sediment-pore-water-dissolved-organic-matter-in-four-chinese-lakes
#5
Khan M G Mostofa, Wen Li, Fengchang Wu, Cong-Qiang Liu, Haiqing Liao, Li Zeng, Min Xiao
Sediment pore waters were examined in four Chinese lakes (Bosten, Qinghai, Chenghai and Dianchi) to characterise the sources of dissolved organic matter (DOM) and their microbial changes in the sediment depth profiles. Parallel factor (PARAFAC) modelling on the sample fluorescence spectra confirmed that the pore water DOM was mostly composed of two components with a mixture of both allochthonous and autochthonous fulvic acid-like substances in three lakes, except Lake Dianchi, and protein-like components in Lake Bosten...
November 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29091837/enhancing-peat-metal-sorption-and-settling-characteristics
#6
Tiina Leiviskä, Muhammad Kamran Khalid, Harshita Gogoi, Juha Tanskanen
Peat is an excellent material for metal sorption since it naturally contains different kinds of functional groups that can sorb metal cations from water. The main objective of this work was to test low-cost treatment (acid and alkali) methods for natural peat, which would improve the settling properties of peat particles while maintaining its metal removal efficiency. Particularly, the poor settling properties of peat hinder its practical application. The study revealed that NaOH-treated peat (0.1M) had excellent settling properties and could be applied in wastewater applications having mixing and settling systems without a settling aid...
October 29, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29080111/influence-of-interaction-between-%C3%AE-fe2o3-nanoparticles-and-dissolved-fulvic-acid-on-the-physiological-responses-in-synechococcus-sp-pcc7942
#7
Meilin He, Yuting Chen, Yongquan Yan, Shanmei Zhou, Changhai Wang
The ecotoxicity of α-Fe2O3 nanoparticles (NPs) and its interaction with a typical natural organic matter (NOM), fulvic acid (FA) on the physiological responses of Synechococcus sp. PCC7942 was studied. α-Fe2O3 NPs inhibited the algae growth at concentration higher than 10 mg L(-1) and induced oxidative stress, indicated by enhanced antioxidant enzymes activities, elevated protein and sugar content. FA could efficiently recover cell growth and reduce antioxidant enzyme activities which induced by α-Fe2O3 NPs, indicating the toxicity of NPs was alleviated in the presence of FA...
October 27, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29078188/cu-fe3o4-core-shell-nanoparticle-catalyzed-oxidative-degradation-of-the-antibiotic-oxytetracycline-in-pre-treated-landfill-leachate
#8
Van Luan Pham, Do-Gun Kim, Seok-Oh Ko
Novel Cu@Fe3O4 core-shell nanoparticles prepared via a simple reduction method were evaluated for degradation of oxytetracycline (OTC) in pre-treated leachate (Lp-TREA) (leachate treated by conventional methods). Changes in the characteristics of dissolved organic matter (DOM) in the leachate were also investigated to gain a better understanding of the effects of DOM on the performance of Cu@Fe3O4. An excellent OTC degradation of >99% was achieved within 30 min under conditions of 1 g/L Cu@Fe3O4, 20 mg/L OTC, 20 mM H2O2, and initial pH 3...
October 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/29066205/protonation-dependent-heterogeneity-in-fluorescent-binding-sites-in-sub-fractions-of-fulvic-acid-using-principle-component-analysis-and-two-dimensional-correlation-spectroscopy
#9
Fanhao Song, Fengchang Wu, Baoshan Xing, Tingting Li, Weiying Feng, John P Giesy, Wenjing Guo, Hao Wang, Shasha Liu, Yingchen Bai
Heterogeneous distributions of proton binding sites within sub-fractions of fulvic acid (FA3-FA13) were investigated by use of synchronous fluorescence spectra (SFS), combined with principle component analysis (PCA) and two-dimensional correlation spectroscopy (2D-COS). Tryptophan-like, fulvic-like and humic-like materials were observed in SFS. Tyrosine-like materials were identified by use of SFS-PCA analysis. Combined information from synchronous-asynchronous maps and dissociation constants (pKa) was used to describe heterogeneity of binding sites for protons within each sub-fraction...
October 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29057845/variations-of-escherichia-coli-o157-h7-survival-in-purple-soils
#10
Taoxiang Zhang, Suping Hu, Wenhao Yang
Escherichia coli O157:H7 is a well-recognized cause of human illness. Survival of Escherichia coli O157:H7 in five purple soils from Sichuan Province was investigated. The dynamics of E. coli O157:H7 survival in purple soils were described by the Weibull model. Results showed that this model is suitable to fit survival curves of E. coli O157:H7 in purple soils, with the calculated td value (survival time needed to reach the detection limit of 100 CFU·g(-1)) ranging from 2.99 days to 26.36 days. The longest survival time of E...
October 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29055598/influence-of-humic-substances-and-iron-and-aluminum-ions-on-the-sorption-of-acetamiprid-to-an-arable-soil
#11
Hirotatsu Murano, Katsuhiro Suzuki, Saori Kayada, Mitsuhiko Saito, Naoya Yuge, Takuji Arishiro, Akira Watanabe, Toshiyuki Isoi
Humic substances (HS) in soil and sediments, and surface water influence the behavior of organic xenobiotics in the environment. However, our knowledge of the effects of specific HS fractions, i.e., humic acids (HAs), fulvic acids (FAs), and humin (HM), on the sorption of organic xenobiotics is limited. The neonicotinoid insecticide acetamiprid is thought to contribute to the collapse of honeybee colonies. To understand the role that soil organic matter plays in the fate of acetamiprid, interactions between acetamiprid and the above HS fractions were examined...
February 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29055267/nature-differences-of-fulvic-acid-fractions-induced-by-extracted-sequence-as-explanatory-factors-for-binding-characteristics-of-cu-2
#12
Zhenrui Zhang, Changwei Lü, Jiang He, Manshu Gao, Boyi Zhao, Bin Zhou, Jing Guo, Haijun Zhou, Xiaoting Liu, Zhuoming Li, Wenjing Shi, Yongjie Jiao, Wenxi Zhao, Yu Zhang
The isolation of fulvic acid (FA) fractions with relatively homogeneity is a key to reveal the binding mechanisms between FA and heavy metals. In this work, nine FA fractions were obtained using sequential alkali extraction procedure and nature differences of the extracted FA fractions were considered as explanatory factors for binding characteristics of Cu(2+). The results indicate that the contents of carboxyl and phenolic groups decrease with increasing extractions along with an opposite trend for the content of nitrogen-containing groups...
October 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29054642/optical-properties-of-algogenic-organic-matter-within-the-growth-period-of-chlorella-sp-and-predicting-their-disinfection-by-product-formation
#13
Lap-Cuong Hua, Jr-Lin Lin, Ming-Yang Syue, Chihpin Huang, Pei-Chung Chen
Algogenic organic matter (AOM) in eutrophic waters is a well-known precursor to disinfection by-product (DBP) formation in drinking water. This purpose of this study is (i) to characterize the optical properties of AOM origins, including intra- (IOM) and extra-cellular organic matter (EOM), derived from Chlorella sp. growth as precursors to two major carbonaceous DBPs (C-DBPs), trihalomethanes (THMs) and haloacetic acids (HAAs) and (ii) to correlate these optical properties with THM and HAA formation potential (FP) in order to predict DBP formation...
October 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29032096/influence-of-inoculating-white-rot-fungi-on-organic-matter-transformations-and-mobility-of-heavy-metals-in-sewage-sludge-based-composting
#14
Chaosheng Zhang, Ying Xu, Meihua Zhao, Hongwei Rong, Kefang Zhang
White-rot fungi, Phanerochaete chrysosporium was inoculated to sewage sludge composting. Its effect on transformation of organic matter and mobility of heavy metals (Zn, Pb, Cu, and Ni) was studied. Detailed sampling was performed to measure C contents in humic extracts (HE), humic acids (HAs), fulvic acids (FAs), humin and distribution of heavy metals, including acid exchangeable fraction (AE), reducible fraction (RED), oxidization fraction (OXI) and residual fraction (RES). In our study, it is evident that the HE, HAs increased obviously and hydrolyzed humin decreased markedly in inoculation...
October 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29031799/impact-of-humic-acid-on-the-photoreductive-degradation-of-perfluorooctane-sulfonate-pfos-by-uv-iodide-process
#15
Zhuyu Sun, Chaojie Zhang, Pei Chen, Qi Zhou, Michael R Hoffmann
Iodide photolysis under UV illumination affords an effective method to produce hydrated electrons (eaq(-)) in aqueous solution. Therefore, UV/Iodide photolysis can be utilized for the reductive degradation of many recalcitrant pollutants. However, the effect of naturally occurring organic matter (NOM) such as humic and fulvic acids (HA/FA), which may impact the efficiency of UV/Iodide photoreduction, is poorly understood. In this study, the UV photoreductive degradation of perfluorooctane sulfonate (PFOS) in the presence of I(-) and HA is studied...
October 6, 2017: Water Research
https://www.readbyqxmd.com/read/29028407/synthesis-of-carboxylated-styrene-polymer-for-internal-calibration-of-fourier-transform-ion-cyclotron-resonance-mass-spectrometry-of-humic-substances
#16
Alexander Zherebker, Alexandra V Turkova, Yury Kostyukevich, Alexey Kononikhin, Kirill V Zaitsev, Igor A Popov, Eugene Nikolaev, Irina V Perminova
We report synthesis and application of the novel carboxylated styrene for internal calibration of Fourier transform ion cyclotron resonance mass-spectra of humic substances. The calibrant was synthesized in five steps from acetylsalicylic acid (aspirin) followed by spontaneous polymerization of vinyl salicylic acid. Aromatic nature of the prepared polymer enabled its simultaneous analysis in the presence of the Suwannee River fulvic acid without using dual-spray approach. The major advantage of the calibrant proposed in this study is a lack of suppression of humic substances signals and maintenance of peak intensity distribution...
August 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29027076/assessing-the-stability-in-dry-mycelial-fertilizer-of-penicillium-chrysogenum-as-soil-amendment-via-fluorescence-excitation-emission-matrix-spectra-organic-matter-s-transformation-and-maturity
#17
Bing Wang, Chen Cai, Guomin Li, Huiling Liu
Utilization as dry mycelial fertilizer (DMF) produced from penicillin fermentation fungi mycelium (PFFM) with an acid-heating pretreatment is a potential way. To study the transformation and stability of water-extractable organic matter in DMF-amended soil via fluorescence regional integration (FRI) of fluorescence excitation-emission matrix (EEM), a soil experiment in pot was carried out. The results showed that residual penicillin (about 32 mg/kg) was almost degraded in the first 5 days, indicating that the drug pollution was in control...
October 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28994595/pertechnetate-induced-addition-of-sulfide-in-small-olefinic-acids-formation-of-tco-dimercaptosuccinate-2-5-and-tco-mercaptosuccinate-2-3-analogues
#18
Kimberly M Reinig, Rachel Seibert, Daniel Velazquez, Jakob Baumeister, Firouzeh Najafi Khosroshahi, Wei Wycoff, Jeff Terry, John E Adams, Carol A Deakyne, Silvia S Jurisson
Technetium-99 ((99)Tc) is important to the nuclear fuel cycle as a long-lived radionuclide produced in ∼6% fission yield from (235)U or (239)Pu. In its most common chemical form, namely, pertechnetate ((99)TcO4(-)), it is environmentally mobile. In situ hydrogen sulfide reduction of pertechnetate has been proposed as a potential method to immobilize environmental (99)TcO4(-) that has entered the environment. Reactions of (99)TcO4(-) with sulfide in solution result in the precipitation of Tc2S7 except when olefinic acids, specifically fumaric or maleic acid, are present; a water-soluble (99)Tc species forms...
November 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28991969/photosensitized-degradation-of-amitriptyline-and-its-active-metabolite-nortriptyline-in-aqueous-fulvic-acid-solution
#19
Yong Chen, Jianfeng Liang, Lu Liu, Xiye Lu, Jianwu Deng, Ivan P Pozdnyakov, Yuegang Zuo
Amitriptyline is a frequently prescribed tricyclic antidepressant. Although amitriptyline and its active metabolite, nortriptyline, have been widely detected in natural waters, their environmental fate due to photodegradation is poorly understood. Here we describe a study conducted to investigate the photodegradation of amitriptyline and its active metabolite under simulated sunlight. Neither amitriptyline nor nortriptyline underwent direct photodegradation, but rapid photosensitized degradation did occur in fulvic acid (FA) solutions...
September 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28987570/effects-of-organic-matter-fraction-and-compositional-changes-on-distribution-of-cadmium-and-zinc-in-long-term-polluted-paddy-soils
#20
Tong Zhou, Longhua Wu, Yongming Luo, Peter Christie
Soil particulate organic matter (POM) has rapid turnover and metal enrichment, but the interactions between organic matter (OM) and metals have not been well studied. The present study aimed to investigate changes in the OM concentration and composition of the POM fraction and their corresponding effects on metal distribution and extractability in long-term polluted paddy soils. Soil 2000-53 μm POM size fractions had higher contents of C-H and C=O bonds, C-H/C=O ratios and concentrations of fulvic acid (FA), humic acid (HA), cadmium (Cd) and zinc (Zn) than the bulk soils...
October 5, 2017: Environmental Pollution
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