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https://www.readbyqxmd.com/read/28577143/spectroscopic-and-molecular-characterization-of-humic-substances-hs-from-soils-and-sediments-in-a-watershed-comparative-study-of-hs-chemical-fractions-and-the-origins
#1
Morgane Derrien, Yun Kyung Lee, Jae-Eun Park, Penghui Li, Meilian Chen, Sang Hee Lee, Soo Hyung Lee, Jun-Bae Lee, Jin Hur
Optical properties and molecular composition of humic substances (HS) can provide valuable information on the sources and the history of the associated biogeochemical processes. In this study, many well-known spectral and molecular characteristics were examined in eight different HS samples, which were extracted from soils and sediments located in a forested watershed, via two advanced tools including fluorescence excitation emission matrix-parallel factor analysis (EEM-PARAFAC) and high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)...
June 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28574469/fluorometric-index-for-sensing-oil-in-the-sea-environment
#2
Emilia Baszanowska, Zbigniew Otremba
Excitation-emission matrix spectroscopy (EEMS) was applied to determine the fluorometric index (FI) as a parameter indicating the presence of a source of oil pollution in a specific area of the sea. Seawater from the Polish coast (the Baltic Sea) and the same water combined with various amounts of crude oil extracted from the Baltic Sea shelf (Petrobaltic-type oil) were used in this study. The FI values were calculated for excitation and emission wavelengths found at the maximal peak, taking into account the natural seawater and the seawater artificially contaminated (for an oil-to-water ratio range of 0...
June 2, 2017: Sensors
https://www.readbyqxmd.com/read/28550631/study-on-substrate-metabolism-process-of-saline-waste-sludge-and-its-biological-hydrogen-production-potential
#3
Zengshuai Zhang, Liang Guo, Qianqian Li, Yangguo Zhao, Mengchun Gao, Zonglian She
With the increasing of high saline waste sludge production, the treatment and utilization of saline waste sludge attracted more and more attention. In this study, the biological hydrogen production from saline waste sludge after heating pretreatment was studied. The substrate metabolism process at different salinity condition was analyzed by the changes of soluble chemical oxygen demand (SCOD), carbohydrate and protein in extracellular polymeric substances (EPS), and dissolved organic matters (DOM). The excitation-emission matrix (EEM) with fluorescence regional integration (FRI) was also used to investigate the effect of salinity on EPS and DOM composition during hydrogen fermentation...
May 26, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28549327/achievement-performance-and-characteristics-of-microbial-products-in-a-partial-nitrification-sequencing-batch-reactor-as-a-pretreatment-for-anaerobic-ammonium-oxidation
#4
Heng Dong, Keyi Zhang, Xiao Han, Bin Du, Qin Wei, Dong Wei
This study was carried out to evaluate achievement, performance and characteristics of microbial products in a partial nitrification sequencing batch reactor as a pretreatment for anaerobic ammonium oxidation (anammox). After 100 days long-term operation, the effluent NO2(-)-N/NH4(+)N ratio of the reactor was average at 1.3 and NO3(-)-N concentration was low by controlling low dissolved oxygen (DO) concentration, which was considered as the ideal influent for anammox. Specific oxygen uptake rate (SOUR) implied that (SOUR)NH4 and (SOUR)NO2 of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) in sludge changed from 21...
May 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28540548/influence-of-surface-properties-of-ro-membrane-on-membrane-fouling-for-treating-textile-secondary-effluent
#5
Zhonglong Yin, Cheng Yang, Chao Long, Aimin Li
Reverse osmosis (RO) is a promising technology for treating and reusing textile secondary effluent (SE). To better understand the effect of membrane surface properties on membrane fouling, the performances of three commercial polyamide thin-film composite RO membranes (BW30-4040, CPA2-4040, and RE-4040-FEN) with different roughness and hydrophilicity were investigated for treating textile SE. The RO membranes were characterized by ATR-FTIR, SEM, AFM, and contact angle, respectively. The results showed that the flux increased with an increase in the surface hydrophilicity of membrane...
May 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28432890/characterization-of-spectral-responses-of-dissolved-organic-matter-dom-for-atrazine-binding-during-the-sorption-process-onto-black-soil
#6
Yifan Wang, Xinyuan Zhang, Xing Zhang, Qingjuan Meng, Fengjie Gao, Ying Zhang
This study was aim to investigate the interaction between soil-derived dissolved organic matter (DOM) and atrazine as a kind of pesticides during the sorption process onto black soil. According to the experimental data, the adsorption capacity of Soil + DOM, Soil and DOM were 41.80, 31.45 and 9.35 mg kg(-1), separately, which indicated that DOM significantly enhanced the adsorption efficiency of atrazine by soil. Data implied that the pseudo-second-order kinetic equation could well explain the adsorption process...
April 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28417327/influence-of-land-use-and-land-cover-on-the-spatial-variability-of-dissolved-organic-matter-in-multiple-aquatic-environments
#7
Shatrughan Singh, Padmanava Dash, Saurav Silwal, Gary Feng, Ardeshir Adeli, Robert J Moorhead
Water quality of lakes, estuaries, and coastal areas serves as an indicator of the overall health of aquatic ecosystems as well as the health of the terrestrial ecosystem that drains to the water body. Land use and land cover plays not only a significant role in controlling the quantity of the exported dissolved organic matter (DOM) but also influences the quality of DOM via various biogeochemical and biodegradation processes. We examined the characteristics and spatial distribution of DOM in five major lakes, in an estuary, and in the coastal waters of the Mississippi, USA, and investigated the influence of the land use and land cover of their watersheds on the DOM composition...
April 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28402898/predicting-potential-release-of-dissolved-organic-matter-from-biochars-derived-from-agricultural-residues-using-fluorescence-and-ultraviolet-absorbance
#8
Ming Li, Afeng Zhang, Haiming Wu, Hai Liu, Jialong Lv
A combination of fluorescence excitation-emission (EEM) spectrophotometry with parallel factor analysis (PARAFAC) and UV-vis spectroscopy was used to assess dissolved organic matter (DOM) release by the wheat straw-derived biochar in various environmental conditions. The results showed that the concentration of dissolved organic carbon (DOC) extracted from the biochar ranged from 435 to 5000mgkg(-1), and the high DOM release would occur under the high temperature and alkaline environmental conditions. Four humic acid-like substances (C1, C2, C4 and C5), one fulvic acid-like substance (C3) and one tryptophan-like substance (C6) were identified by PARAFAC model...
March 31, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28400762/production-and-reutilization-of-fluorescent-dissolved-organic-matter-by-a-marine-bacterial-strain-alteromonas-macleodii
#9
Shuji Goto, Yuya Tada, Koji Suzuki, Youhei Yamashita
The recalcitrant fraction of marine dissolved organic matter (DOM) plays an important role in carbon storage on the earth's surface. Bacterial production of recalcitrant DOM (RDOM) has been proposed as a carbon sequestration process. It is still unclear whether bacterial physiology can affect RDOM production. In this study, we conducted a batch culture using the marine bacterial isolate Alteromonas macleodii, a ubiquitous gammaproteobacterium, to evaluate the linkage between bacterial growth and DOM production...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28391456/characterization-of-extracellular-polymeric-substances-in-biofilms-under-long-term-exposure-to-ciprofloxacin-antibiotic-using-fluorescence-excitation-emission-matrix-and-parallel-factor-analysis
#10
Chaochao Gu, Pin Gao, Fan Yang, Dongxuan An, Mariya Munir, Hanzhong Jia, Gang Xue, Chunyan Ma
The presence of antibiotic residues in the environment has been regarded as an emerging concern due to their potential adverse environmental consequences such as antibiotic resistance. However, the interaction between antibiotics and extracellular polymeric substances (EPSs) of biofilms in wastewater treatment systems is not entirely clear. In this study, the effect of ciprofloxacin (CIP) antibiotic on biofilm EPS matrix was investigated and characterized using fluorescence excitation-emission matrix (EEM) and parallel factor (PARAFAC) analysis...
May 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28386240/embodiment-and-emotional-memory-in-first-vs-second-language
#11
Jenny C Baumeister, Francesco Foroni, Markus Conrad, Raffaella I Rumiati, Piotr Winkielman
Language and emotions are closely linked. However, previous research suggests that this link is stronger in a native language (L1) than in a second language (L2) that had been learned later in life. The present study investigates whether such reduced emotionality in L2 is reflected in changes in emotional memory and embodied responses to L2 in comparison to L1. Late Spanish/English bilinguals performed a memory task involving an encoding and a surprise retrieval phase. Facial motor resonance and skin conductance (SC) responses were recorded during encoding...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28382432/reliability-improvement-for-predicting-acid-forming-potential-of-rock-samples-using-static-tests
#12
Chamteut Oh, Sangwoo Ji, Chul-Min Chon, Giljae Yim, Youngwook Cheong
In predicting the acid-forming potential of rock samples, a combination of acid-base accounting (ABA) and net acid generation (NAG) tests has been commonly used. While simple and economical, this method sometimes shows low reliability such as categorizing certain samples as uncertain (UC). ABA and NAG tests were modified to selectively recover valid minerals in nature and substituted for the original tests. ABA test overestimated acid-producing capacity (in the case of weathered samples) and acid-neutralizing capacity (in the case of plagioclase-including samples) compared to the modified ABA test...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28372160/characterization-of-cereal-flours-by-fluorescence-spectroscopy-coupled-with-parafac
#13
Lea Lenhardt, Ivana Zeković, Tatjana Dramićanin, Bojana Milićević, Jovana Burojević, Miroslav D Dramićanin
This paper presents parallel factor analysis (PARAFAC) of fluorescence of cereal flours. Excitation-emission matrices (EEM's) of different cereal flours (wheat, corn, rye, rice, oat, spelt, barley and buckwheat) were measured in a front-face configuration over the ultraviolet-visible spectral range. EEM's showed that flours strongly fluoresce in two spectral regions, where amino acids, tocopherols, pyridoxine and 4-aminobenzoic acid show intense emissions. 4-component PARAFAC was used to model flour fluorescence and to decompose EEM's into excitation and emission spectra of each component...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28370723/persistence-of-historical-population-structure-in-an-endangered-species-despite-near-complete-biome-conversion-in-california-s-san-joaquin-desert
#14
Jonathan Q Richmond, Dustin A Wood, Michael F Westphal, Amy G Vandergast, Adam D Leaché, Lawrence R Saslaw, H Scott Butterfield, Robert N Fisher
Genomic responses to habitat conversion can be rapid, providing wildlife managers with time-limited opportunities to enact recovery efforts that use population connectivity information that reflects predisturbance landscapes. Despite near-complete biome conversion, such opportunities may still exist for the endemic fauna and flora of California's San Joaquin Desert, but comprehensive genetic data sets are lacking for nearly all species in the region. To fill this knowledge gap, we studied the rangewide population structure of the endangered blunt-nosed leopard lizard Gambelia sila, a San Joaquin Desert endemic, using restriction site-associated DNA (RAD), microsatellite and mtDNA data to test whether admixture patterns and estimates of effective migration surfaces (EEMS) can identify land areas with high population connectivity prior to the conversion of native xeric habitats...
March 30, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28361397/integration-of-coagulation-and-adsorption-for-removal-of-n-nitrosodimethylamine-ndma-precursors-from-biologically-treated-municipal-wastewater
#15
Miaomiao Wang, Yingjie Meng, Defang Ma, Yan Wang, Fengli Li, Xing Xu, Chufan Xia, Baoyu Gao
This study investigated the N-nitrosodimethylamine (NDMA) formation potential of various dissolved organic matter (DOM) fractions in biologically treated municipal wastewater by UF fractionation, XAD-8 resin adsorption isolation, and excitation and emission matrix (EEM) fluorescence spectroscopy. Removal of various NDMA precursor fractions was also analyzed to evaluate the efficiency of traditional water treatment processes (coagulation, adsorption, and coagulation-adsorption). Results showed that NDMA were mainly formed by low molecular weight (MW) fractions (<30 kDa) and hydrophilic fractions (HiS) in biologically treated municipal wastewater...
May 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28351133/monitoring-the-behavior-of-emerging-contaminants-in-wastewater-impacted-rivers-based-on-the-use-of-fluorescence-excitation-emission-matrixes-eem
#16
Massimiliano Sgroi, Paolo Roccaro, Gregory V Korshin, Federico G A Vagliasindi
This study investigated the applicability of fluorescence indexes based on the interpretation of excitation emission matrices (EEMs) by PARAFAC analysis and by selecting fluorescence intensities at a priori defined excitation/emission pairs as surrogates for monitoring the behavior of emerging organic compounds (EOCs) in two catchment basins impacted by wastewater discharges. Relevant EOC and EEM data were obtained for a 90 km stretch of the Simeto River, the main river in Sicily, and the smaller San Leonardo River, which was investigated for a 17 km stretch...
April 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28340733/migration-test-of-bisphenol-a-from-polycarbonate-cups-using-excitation-emission-fluorescence-data-with-parallel-factor-analysis
#17
M L Spagnuolo, F Marini, L A Sarabia, M C Ortiz
Bisphenol A (BPA) is one of the most largely produced chemical in the world; it is used to make plastics and epoxy resins. The endocrine disruptor potential of BPA is well known, but recent researches suggest a relationship between chronic exposure to BPA, genotoxic activity and epigenetic modifications. The main source of exposure to BPA includes food contact materials (FCM). Thus simple and robust test methods are needed to improve the migration test of BPA. In this work, a non-separative, easy, fast and inexpensive spectrofluorimetric method based on the second order calibration of excitation-emission fluorescence matrices (EEMs) was proposed for the determination of BPA...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28334671/fast-tracking-the-molecular-weight-changes-of-humic-substances-in-coagulation-flocculation-processes-via-fluorescence-eem-parafac
#18
Bilal Aftab, Jin Hur
The removal of a commercial humic acid (HA) and changes in its chemical composition were examined for coagulation/flocculation (C/F) processes based on jar tests using two different coagulants at a wide range of pH. ZrCl4 showed a better performance in eliminating HA than Al2SO4 with the same removal rates at lower dosages. The highest removal rates were found at a neutral pH range (5.0-6.5). The HA was further decomposed into three different humic-like components (C1, C2, and C3) by excitation emission matrix coupled with parallel factor analysis (EEM-PARAFAC)...
July 2017: Chemosphere
https://www.readbyqxmd.com/read/28319761/dynamic-changes-of-dissolved-organic-matter-in-membrane-bioreactors-at-different-organic-loading-rates-evidence-from-spectroscopic-and-chromatographic-methods
#19
Tahir Maqbool, Jinwoo Cho, Jin Hur
Excitation emission matrix-parallel factor analysis (EEM-PARAFAC) and size exclusion chromatography (SEC) were utilized to explore the dynamics in extracellular polymeric substances (EPS), soluble microbial products (SMP), and effluent for the membrane bioreactors at two different organic loading rates (OLRs). Combination of three different fluorescent components explained the compositional changes of dissolved organic matter. The lower OLR resulted in a higher production of tryptophan-like component (C1) in EPS, while the opposite trends were found for the other two components (humic-like C2 and tyrosine-like C3), signifying the role of C1 in the endogenous condition...
June 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28299571/impacts-of-potassium-ferrate-vi-on-the-growth-and-organic-matter-accumulation-production-and-structural-changes-in-the-cyanobacterium-microcystis-aeruginosa
#20
Shu-Yu Liu, Jingling Xu, Wen-Li Chen, Berthold E David, Minghong Wu, Fang Ma
Cyanobacterial blooms generated by nutrient addition into aquatic systems pose serious risks to ecosystems and human health. Though there are established chemical, physical, and biological means of eradication, more efficient and environmentally friendly measures are desired. This study investigates the effect of potassium ferrate(VI) on the growth and intracellular and extracellular organic matter accumulations of the cyanobacterium Microcystis aeruginosa. Cultures were inoculated with three separate concentrations of potassium ferrate(VI) (3, 15, 30 mg L(-1)) and monitored by measuring chlorophyll-a (Chl-a) and intracellular/extracellular dissolved organic carbon...
April 2017: Environmental Science and Pollution Research International
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