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https://www.readbyqxmd.com/read/28324841/metal-mobilization-from-metallurgical-wastes-by-soil-organic-acids
#1
Anna Potysz, Malgorzata Grybos, Jakub Kierczak, Gilles Guibaud, Patrice Fondaneche, Piet N L Lens, Eric D van Hullebusch
Three types of Cu-slags differing in chemical and mineralogical composition (historical, shaft furnace, and granulated slags) and a matte from a lead recovery process were studied with respect to their susceptibility to release Cu, Zn and Pb upon exposure to organic acids commonly encountered in soil environments. Leaching experiments (24-960 h) were conducted with: i) humic acid (20 mg/L) at pH t0 = 4.4, ii) fulvic acid (20 mg/L) at pH t0 = 4.4, iii) an artificial root exudates (ARE) (17.4 g/L) solution at pH t0 = 4...
March 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28299570/occurrence-and-photodegradation-of-methylmercury-in-surface-water-of-wen-rui-tang-river-network-wenzhou-china
#2
Shuihong Pan, Chuchu Feng, Jialu Lin, Lidong Cheng, Chengjun Wang, Yuegang Zuo
The spatial distribution and seasonal variations of methylmercury (MeHg) in Wen-Rui-Tang (WRT) River network were investigated by monitoring the MeHg concentrations in surface water samples collected from 30 sites across the river network over four seasons. Detection frequencies and concentrations of MeHg were generally higher in January, indicating that low sunlight irradiation, wind speed, and temperature conditions might enhance the persistence of MeHg in surface water. The MeHg levels varied with sampling locations, with the highest concentrations being observed in the industrial area especially around wastewater outfall, revealing that the mercury contamination in WRT River mainly comes from the industrial wastewater...
March 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28290085/oxidation-of-indometacin-by-ferrate-vi-kinetics-degradation-pathways-and-toxicity-assessment
#3
Junlei Huang, Yahui Wang, Guoguang Liu, Ping Chen, Fengliang Wang, Jingshuai Ma, Fuhua Li, Haijin Liu, Wenying Lv
The oxidation of indometacin (IDM) by ferrate(VI) (Fe(VI)) was investigated to determine the reaction kinetics, transformation products, and changes in toxicity. The reaction between IDM and Fe(VI) followed first-order kinetics with respect to each reactant. The apparent second-order rate constants (k app) decreased from 9.35 to 6.52 M(-1) s(-1), as the pH of the solution increased from 7.0 to 10.0. The pH dependence of k app might be well explained by considering the species-specific rate constants of the reactions of IDM with Fe(VI)...
March 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28259581/potential-rainfall-intensity-and-ph-driven-shifts-in-the-apparent-fluorescent-composition-of-dissolved-organic-matter-in-rainwater
#4
Yongqiang Zhou, Xiaolong Yao, Yibo Zhang, Kun Shi, Yunlin Zhang, Erik Jeppesen, Guang Gao, Guangwei Zhu, Boqiang Qin
Perturbations of rainwater chromophoric dissolved organic matter (CDOM) fluorescence induced by changes in rainfall intensity and pH were investigated by field observations and laboratory pH titrations. Microbial humic-like fluorophores dominated the rainwater CDOM pool, followed by tryptophan-like and tyrosine-like substances. Increased rainfall intensity had notable dilution effects on all six fluorescent components (C1-C6) identified using parallel factor (PARAFAC) analysis, the effect being especially pronounced for the microbial humic-like C1, tryptophan-like C3, and tyrosine-like C5...
March 1, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28249210/elimination-of-microcystin-lr-and-residual-mn-species-using-permanganate-and-powdered-activated-carbon-oxidation-products-and-pathways
#5
Boyoung Jeong, Min-Seok Oh, Hyun-Mee Park, Chanhyuk Park, Eun-Ju Kim, Seok Won Hong
The oxidation of microcystin-LR (MC-LR) in deionized water (DI) and river water using potassium permanganate (KMnO4) at a neutral pH and at 23 ± 2 °C was investigated. These two aqueous systems (i.e., DI and river water) gave comparable second-order rate constants (289.9 and 285.5 M(-1)s(-1) (r(2) > 0.99), respectively), which confirmed the effectiveness of this oxidation process for the treatment of natural surface water. The presence of either humic or fulvic acid reduced the removal efficiency of MC-LR, with the latter exhibiting a greater inhibitory effect...
February 20, 2017: Water Research
https://www.readbyqxmd.com/read/28248517/determining-the-concentration-dependent-transformations-of-ag-nanoparticles-in-complex-media-using-sp-icp-ms-and-au-ag-core-shell-nanoparticles-as-tracers
#6
Ruth C Merrifield, Chady Stephan, Jamie Lead
The fate, behavior, and impact of engineered nanoparticles (NPs) in toxicological and environmental media are driven by complex processes which are difficult to quantify. A key limitation is the ability to perform measurements at low and environmentally relevant concentrations, since concentration may be a key factor determining fate and effects. Here, we use single particle inductively coupled mass spectroscopy (SP-ICP-MS) to measure directly NP diameter and particle number concentration of suspensions containing gold-silver core-shell (Au@Ag) NPs in EPA moderately hard water (MHW) and MHW containing 2...
March 1, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28244332/effect-of-fulvic-and-humic-acids-on-iron-and-manganese-homeostasis-in-rats
#7
József Szabó, András Valentin Vucskits, Erzsébet Berta, Emese Andrásofszky, András Bersényi, István Hullár
The objective of this study was to investigate the effects of fulvic acid (FA) and humic acid (HA) as the two main compounds of humic substances, separately on Fe and Mn homeostasis. Seventy-two male Wistar rats were randomly divided into 9 experimental groups. The control diet (AIN-93G formula) and diets supplemented with 0.1%, 0.2%, 0.4% and 0.8% HA or FA were fed for 26 days. Fe and Mn concentrations of the large intestinal content, liver, kidney, femur and hair were determined. No significant differences were observed in the production parameters...
March 2017: Acta Veterinaria Hungarica
https://www.readbyqxmd.com/read/28228360/earthworms-change-the-quantity-and-composition-of-dissolved-organic-carbon-and-reduce-greenhouse-gas-emissions-during-composting
#8
Abebe Nigussie, Sander Bruun, Andreas de Neergaard, Thomas W Kuyper
Dissolved organic carbon (DOC) has recently been proposed as an indicator of compost stability. We assessed the earthworms' effect on DOC content and composition during composting, and linked compost stability to greenhouse gas emissions and feeding ratio. Earthworms reduced total DOC content, indicating larger stability of vermicompost than of thermophilic compost. The concentrations of humic acid and fulvic acid were reduced by earthworms, whereas there was no significant effect on hydrophobic neutrals and hydrophilics...
February 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28187391/dissolved-organic-matter-affects-the-bioaccumulation-of-copper-and-lead-in-chlorella-pyrenoidosa-a-case-of-long-term-exposure
#9
Wen Shi, Zanfang Jin, Shiyin Hu, Xiaoman Fang, Feili Li
This study evaluated the impact of dissolved organic matter (DOM) of varying molecule weights (MWs) on long-term exposure to Cu and Pb in Chlorella pyrenoidosa. Citric acid, fulvic acid, and humic acid, in the order of increasing MWs, were selected to represent DOM. The results showed that DOM with larger MWs had stronger inhibitory effects on the bioavailability of Cu to algae. However, the biosorption isotherm of Pb in the presence of DOM was different: as Pb equilibrium concentration increased, the biosorption capacity increased sharply to a maximum, then decreased...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28176154/the-effect-of-wastewater-effluent-derived-ligands-on-copper-and-zinc-complexation
#10
C Constantino, S D W Comber, M D Scrimshaw
The shift toward bioavailability-based standards for metals such as copper and zinc not only improves the ecological relevance of the standard but also introduces significant complexity into assessing compliance. This study examined differences in the copper and zinc complexation characteristics of effluents from a range of different sewage treatment works and in relation to so-called 'natural' samples. This information is essential to determine whether the inclusion of effluent-specific complexation characteristics within the regulatory framework could enhance the environmental relevance of compliance criteria...
February 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28167351/evaluation-of-starch-based-flocculants-for-the-flocculation-of-dissolved-organic-matter-from-textile-dyeing-secondary-wastewater
#11
Hu Wu, Zhouzhou Liu, Aimin Li, Hu Yang
China is a major textile manufacturer in the world; as a result, large quantities of dyeing effluents are generated every year in the country. In this study, the performances of two cationic starch-based flocculants with different chain architectures, i.e., starch-graft-poly[(2-methacryloyloxyethyl) trimethyl ammonium chloride] (STC-g-PDMC) and starch-3-chloro-2-hydroxypropyl trimethyl ammonium chloride (STC-CTA), in flocculating dissolved organic matter (DOM) in dyeing secondary effluents were investigated and compared with that of polyaluminum chloride (PAC)...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28167266/the-effect-of-mwcnt-treatment-by-h2o2-and-or-uv-on-fulvic-acids-sorption
#12
Bożena Czech
The carbon nanotubes (CNT) present in the wastewater subjected to treatment will possess altered physico-chemical properties. The changed properties will result in the unknown behavior of CNT in the environment after disposal; and it is expected to differ from their pristine analogues. In the present paper the effect of sorption of dissolved organic matter with fulvic acids (FA) as representatives onto UV and/or H2O2 treated CNT was tested. Both kinetics and mechanism of sorption was estimated. The chemical adsorption was a rate limiting step and a pseudo-second order kinetics described the sorption of FA onto UV and/or H2O2 treated CNT...
February 3, 2017: Environmental Research
https://www.readbyqxmd.com/read/28121132/molecular-composition-and-photochemical-reactivity-of-size-fractionated-dissolved-organic-matter
#13
Andrew C Maizel, Christina K Remucal
The photochemical production of reactive species, such as triplet dissolved organic matter ((3)DOM) and singlet oxygen ((1)O2), contributes to the degradation of aquatic contaminants and is related to an array of DOM structural characteristics, notably molecular weight. In order to relate DOM molecular weight, optical properties, and reactive species production, Suwannee River (SRFA) and Pony Lake fulvic acid (PLFA) isolates are fractionated by sequential ultrafiltration, and the resultant fractions are evaluated in terms of molecular composition and photochemical reactivity...
February 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28113066/transformation-of-dissolved-organic-matter-in-concentrated-leachate-from-nanofiltration-during-ozone-based-oxidation-processes-o3-o3-h2o2-and-o3-uv
#14
Hua-Wei Wang, Xiao-Yue Li, Zhi-Peng Hao, Ying-Jie Sun, Ya-Nan Wang, Wei-Hua Li, Yiu Fai Tsang
In this study, the transformation of dissolved organic matter (DOM) in nanofiltration concentrated leachate during three ozone-based oxidation processes (i.e., O3, O3/H2O2 and O3/UV) was investigated. The transformation characteristics of DOM were evaluated by gel filtration chromatography (GFC), XAD-8 resin fractionation, excitation-emission matrix fluorescence spectroscopy (EEM) and Fourier transform infrared spectroscopy (FTIR). Compared with O3-alone process, the removal efficiencies of COD, TOC, and color were improved in O3-combined processes (i...
January 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28104558/composition-and-copper-binding-properties-of-aquatic-fulvic-acids-in-eutrophic-taihu-lake-china
#15
Weiwei Li, Fenfen Zhang, Qi Ye, Dan Wu, Liying Wang, Yihua Yu, Bing Deng, Jinzhou Du
Fulvic acid (FA) plays a significant role in biogenic-elemental cycling in aquatic ecosystems which is highly dependent on their organic composition. In this study, the aquatic FA contents and binding properties during bloom and non-bloom periods in Taihu Lake were investigated by two-dimensional correlation spectroscopy Fourier transform infrared spectroscopy (2D-COS-FTIR), nuclear magnetic resonance (NMR) and elemental analysis. Compared with non-bloom FA, bloom FA was of lower nitrogen content and higher C/N ratio...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28102075/molecular-features-of-humic-acids-and-fulvic-acids-from-contrasting-environments
#16
Judith Schellekens, Peter Buurman, Karsten Kalbitz, Andre van Zomeren, Pablo Vidal-Torrado, Chiara Cerli, Rob N J Comans
Insight in the molecular structure of humic acid (HA) and fulvic acid (FA) can contribute to identify relationships between their molecular properties, and further our quantitative abilities to model important organic matter functions such as metal complexation and association with mineral surfaces. Pyrolysis gas chromatography/mass spectrometry (Py-GC-MS) is used to compare the molecular composition of HA and FA. A systematic comparison was obtained by using samples from different environmental sources, including solid and aqueous samples from both natural and waste sources...
January 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28101708/characterization-of-interaction-between-amino-acids-and-fulvic-like-organic-matter-by-fluorescence-spectroscopy-combining-thermodynamic-calculation
#17
Tao Lin, Bingwei Hou, Jian Wang, Yaqun Xu, Wei Chen
Dissolved organic matter (DOM), as a very fine colloidal suspension, could inevitably affect the transformation process of dissolved organic nitrogen (DON) in drinking water treatment. Tryptophan and tyrosine were used as representatives of DON to investigate the interactions between amino acids and fulvic-like components of fluorescent DOM using titration experiments. The fluorescence intensity decreased significantly with the increasing fulvic acid (FA) concentration, suggesting that FA could greatly quench the intrinsic fluorescence of amino acids such as tryptophan and tyrosine...
January 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091994/source-analysis-of-organic-matter-in-swine-wastewater-after-anaerobic-digestion-with-eem-parafac
#18
Zhuo Zeng, Ping Zheng, Aqiang Ding, Meng Zhang, Ghulam Abbas, Wei Li
Swine wastewater is one of the most serious pollution sources, and it has attracted a great public concern in China. Anaerobic digestion technology is extensively used in swine wastewater treatment. However, the anaerobic digestion effluents are difficult to meet the discharge standard. The results from batch experiments showed that plenty of refractory organic matter remained in the effluents after mesophilic anaerobic digestion for 30 days. The effluent total COD (tCOD) and soluble COD (sCOD) were 483 and 324 mg/L, respectively, with the sCOD/tCOD ratio of 0...
January 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28089895/effects-of-fulvic-acid-on-growth-performance-and-intestinal-health-of-juvenile-loach-paramisgurnus-dabryanus-sauvage
#19
Yang Gao, Jie He, Zhuliu He, Zhiwei Li, Bo Zhao, Yi Mu, Jeong-Yeol Lee, Zhangjie Chu
A 60-day feeding trial was conducted to determine the effect of dietary fulvic acid supplements on intestinal digestive activity (enzymatic analysis), antioxidant activity, immune enzyme activity and microflora composition of juvenile loach (initial weight of 6.2 ± 0.1 g) reared in experimental aquaria. Five test diets containing 0, 0.5, 1.0, 1.5, and 2% fulvic acid were randomly assigned to three aquaria, respectively. Elevated growth performance including final weight, weight gain (WG), specific growth rate (SGR) and feed conversion ratio (FCR) was observed in loaches that were fed fulvic acid...
January 9, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28074362/the-determination-and-fate-of-disinfection-by-products-from-ozonation-chlorination-of-fulvic-acid
#20
Xin Zhong, Chongwei Cui, Shuili Yu
Ozonation of fulvic acid (FA) can result in diverse intermediate oxidation by-products, significantly affecting disinfection by-product (DBP) formation following chlorination. The objective of this study was to provide insight into ozone reaction intermediates and reveal the possible formation pathway of DBPs from ozonation of FA due to the formation of intermediate oxidation by-products. Aldehydes, aromatic acids, short-chain acids, chloroform, and dichloroacetic acid were detected at various ozone dosage additions...
January 10, 2017: Environmental Science and Pollution Research International
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