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Chemosphere

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https://www.readbyqxmd.com/read/28641225/investigation-of-dissociation-constants-for-individual-and-total-naphthenic-acids-species-using-ultra-performance-liquid-chromatography-ion-mobility-time-of-flight-mass-spectrometry-analysis
#1
Rongfu Huang, Pamela Chelme-Ayala, Yanyan Zhang, Mohamed Changalov, Mohamed Gamal El-Din
Ultra-performance liquid chromatography ion mobility time-of-flight mass spectrometry (UPLC-IM-TOFMS) was utilized for the analysis of naphthenic acids (NAs) in fractions of pH-dependent sequential liquid-liquid extractions from oil sands process-affected water. Ion-mobility separation technique allowed the differentiation of OyS-NAs (2 ≤ y ≤ 4) from Ox-NAs (2 ≤ x ≤ 5) via drift time versus retention time separations. The results indicated that the addition of S atom to the O2-NA molecule led to a lower increase in the dissociation constant (pKa) compared to that caused by the addition of O atom...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641226/evaluation-of-trace-element-concentration-in-cancerous-and-non-cancerous-tissues-of-human-stomach
#2
Shadi Kohzadi, Farshad Sheikhesmaili, Ramesh Rahehagh, Baran Parhizkar, Ebrahim Ghaderi, Hozan Loqmani, Behzad Shahmoradi, Ebrahim Mohammadi, Afshin Maleki
Gastric cancer has a high mortality rate in west of Iran. Various environmental elements are proposed as cancer risk factors including trace elements. Trace elements can induce initiation or progression of carcinogenesis via oxidative stress and DNA injury. The aim of this study was to measure and compare some trace element concentration (Ca, Cu, Fe, As, Mg, Ni, Cd and Cr) in gastric cancer tissues and normal tissues. For this purpose, 35 patients with gastric cancer and 30 without any cancer were biopsied...
June 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641228/relationships-between-past-and-present-pesticide-applications-and-pollution-at-a-watershed-outlet-the-case-of-a-horticultural-catchment-in-martinique-french-west-indies
#3
Charles Mottes, Magalie Lesueur Jannoyer, Marianne Le Bail, Mathilde Guéné, Céline Carles, Eric Malézieux
The understanding of factors affecting pesticide transfers to catchment outlet is still at a very early stage in tropical context, and especially on tropical volcanic context. We performed on-farm pesticide use surveys during 87 weeks and monitored pesticides in water weekly during 67 weeks at the outlet of a small catchment in Martinique. We identified three types of pollution. First, we showed long-term chronic pollution by chlordecone, diuron and metolachlor resulting from horticultural practices applied 5-20 years ago (quantification frequency higher than 80%)...
June 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641229/effects-of-short-term-invasion-of-spartina-alterniflora-and-the-subsequent-restoration-of-native-mangroves-on-the-soil-organic-carbon-nitrogen-and-phosphorus-stock
#4
Jianxiang Feng, Jian Zhou, Liming Wang, Xiaowei Cui, Cunxin Ning, Hao Wu, Xiaoshan Zhu, Guanghui Lin
The exotic cordgrass Spartina alterniflora has severely invaded the mangrove wetlands in southern China and ecological restoration using native mangroves was conducted in an attempt to control this invasive species. In this study, the contents and pools of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were quantified to investigate the invasive effects of S. alterniflora and then to evaluate whether the ecological restoration of native mangrove could reverse those effects. S. alterniflora only showed significantly higher organic carbon content in the surface 0-10 cm of soil than in the uninvaded mudflat...
June 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641227/presence-distribution-and-risk-assessment-of-polycyclic-aromatic-hydrocarbons-in-rice-wheat-continuous-cropping-soils-close-to-five-industrial-parks-of-suzhou-china
#5
Yong Li, Ling Long, Jing Ge, Li-Xuan Yang, Jin-Jin Cheng, Ling-Xiang Sun, Changying Lu, Xiang-Yang Yu
Polycyclic aromatic hydrocarbons (PAHs) accumulated in agricultural soils are likely to threaten human health and ecosystem though the food chain, therefore, it is worth to pay more attention to soil contamination by PAHs. In this study, the presence, distribution and risk assessment of 16 priority PAHs in rice-wheat continuous cropping soils close to industrial parks of Suzhou were firstly investigated. The concentrations of the total PAHs ranged from 125.99 ng/g to 796.65 ng/g with an average of 352.94 ng/g...
June 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641224/elemental-copper-nanoparticle-toxicity-to-anaerobic-ammonium-oxidation-and-the-influence-of-ethylene-diamine-tetra-acetic-acid-edta-on-copper-toxicity
#6
Jorge Gonzalez-Estrella, Guangbin Li, Sarah E Neely, Daniel Puyol, Reyes Sierra-Alvarez, Jim A Field
Soluble ions released by elemental copper nanoparticles (Cu(0) NP) are toxic to key microorganisms of wastewater treatment processes. However, their toxicity to anaerobic ammonium oxidation (anammox) has not yet been studied. Chelating agents occurring in wastewater may decrease copper ions (Cu(2+)) concentration and consequently, decrease copper toxicity. This study evaluated Cu(0) NP and CuCl2 toxicity to anammox and the influence of ethylene diamine-tetra acetic acid (EDTA) on copper toxicity. Bioassays were supplemented with Cu(0) NP or CuCl2 with and without EDTA...
June 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641223/paternal-bisphenol-a-diet-changes-prefrontal-cortex-proteome-and-provokes-behavioral-dysfunction-in-male-offspring
#7
Guangying Luo, Ruifen Wei, Shaolin Wang, Jundong Wang
Relatively little attention has been given paternal effects on next generation. Given that Bisphenol A (BPA), a ubiquitous compound in maternal diet, may disrupt brain development and behavior, we hypothesized that paternal BPA diet (PBD) could affect offspring development. Prefrontal cortex (PFC), a vital brain region, is involved in emotion and social behavior. To test whether PBD could alter developing PFC, we carried out a proteomics approach for PFC in male juvenile offspring that responded to PBD (50 mg BPA/kg diet)...
June 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28633064/an-innovative-approach-to-bioremediation-of-mercury-contaminated-soils-from-industrial-mining-operations
#8
Damien McCarthy, Grant C Edwards, Mae S Gustin, Andrew Care, Matthieu B Miller, Anwar Sunna
Soils contaminated with mercury (Hg) have proved expensive and logistically difficult to remediate. Research continues into finding suitable environmentally-friendly and efficient ways of achieving this end. Bioremediation is an option, which employs the strategies microorganisms have evolved to deal with Hg. One microbial strategy involves uptake and intracellular volatilisation of mercuric ions, which passively diffuse from the cell and back into the atmosphere. In this work, Pseudomonas veronii cells grown to stationary phase were immobilised in a xanthan gum-based biopolymer via encapsulation...
June 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641230/combining-chemometric-tools-for-assessing-hazard-sources-and-factors-acting-simultaneously-in-contaminated-areas-case-study-mar-piccolo-taranto-south-italy
#9
Matilda Mali, Maria Michela Dell'Anna, Michele Notarnicola, Leonardo Damiani, Piero Mastrorilli
Almost all marine coastal ecosystems possess complex structural and dynamic characteristics, which are influenced by anthropogenic causes and natural processes as well. Revealing the impact of sources and factors controlling the spatial distributions of contaminants within highly polluted areas is a fundamental propaedeutic step of their quality evaluation. Combination of different pattern recognition techniques, applied to one of the most polluted Mediterranean coastal basin, resulted in a more reliable hazard assessment...
June 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28628902/recycling-stabilised-solidified-drill-cuttings-for-forage-production-in-acidic-soils
#10
Reginald B Kogbara, Bernard B Dumkhana, Josiah M Ayotamuno, Reuben N Okparanma
Stabilisation/solidification (S/S), which involves fixation and immobilisation of contaminants using cementitious materials, is one method of treating drill cuttings before final fate. This work considers reuse of stabilised/solidified drill cuttings for forage production in acidic soils. It sought to improve the sustainability of S/S technique through supplementation with the phytoremediation potential of plants, eliminate the need for landfill disposal and reduce soil acidity for better plant growth. Drill cuttings with an initial total petroleum hydrocarbon (TPH) concentration of 17,125 mg kg(-1) and low concentrations of metals were treated with 5%, 10%, and 20% cement dosages...
June 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28641222/theoretical-evaluation-on-selective-adsorption-characteristics-of-alkali-metal-based-sorbents-for-gaseous-oxidized-mercury
#11
Hongjian Tang, Yufeng Duan, Chun Zhu, Tianyi Cai, Chunfeng Li, Liang Cai
Alkali metal-based sorbents are potential for oxidized mercury (Hg(2+)) selective adsorption but show hardly effect to elemental mercury (Hg(0)) in flue gas. Density functional theory (DFT) was employed to investigate the Hg(0) and HgCl2 adsorption mechanism over alkali metal-based sorbents, including calcium oxide (CaO), magnesium oxide (MgO), potassium chloride (KCl) and sodium chloride (NaCl). Hg(0) was found to weakly interact with CaO (001), MgO (001), KCl (001) and NaCl (001) surfaces while HgCl2 was effectively adsorbed on top-O and top-Cl sites...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28628903/functional-kaolin-supported-nanoscale-zero-valent-iron-as-a-fenton-like-catalyst-for-the-degradation-of-direct-black-g
#12
Jiajiang Lin, Mengqiang Sun, Xinwen Liu, Zuliang Chen
Kaolin supported nanoscale zero-valent iron (K-nZVI) is synthesized and applied as the Fenton-like oxidation catalyst to degrade a model azo dye, Direct Black G (DBG). The characterization of K-nZVI by the high resolution transmission electronmicroscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Energy Diffraction Spectrum (EDS) and X-ray diffraction (XRD) show that kaolin as a support material not only reduces the aggregation of zero-valent iron (nZVI) but also facilitates the Fenton-like oxidation by increasing the local concentration of DBG in the vicinity of nZVI...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28624742/ionic-liquids-toxicity-on-fresh-water-microalgae-scenedesmus-quadricauda-chlorella-vulgaris-botryococcus-braunii-selection-criterion-for-use-in-a-two-phase-partitioning-bioreactor-tppbr
#13
Khurrum Shehzad Quraish, Mohamad Azmi Bustam, Sooridarsan Krishnan, Noor Fathanah Aminuddin, Noraisyah Azeezah, Noraini Abd Ghani, Yoshimitsu Uemura, Jean Marc Lévêque
A promising method of Carbon dioxide (CO2) valorization is to use green microalgae photosynthesis to process biofuel. Two Phase Partitioning Bioreactors (TPPBR) offer the possibility to use non-aqueous phase liquids (NAPL) to enhance CO2 solubility; thus making CO2 available to maximize algae growth. This requires relatively less toxic hydrophobic Ionic Liquids (ILs) that comprise a new class of ionic compounds with remarkable physicochemical properties and thus qualifies them as NAPL candidates. This paper concerns the synthesis of ILs with octyl and butyl chains as well as different cations containing aromatic (imidazolium, pyridinium) and non-aromatic (piperidinum, pyrrolidinium) rings for CO2 absorption studies...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28633065/differential-accumulation-of-pahs-elements-and-pb-isotopes-by-five-lichen-species-from-the-athabasca-oil-sands-region-in-alberta-canada
#14
Joseph R Graney, Matthew S Landis, Keith J Puckett, William B Studabaker, Eric S Edgerton, Allan H Legge, Kevin E Percy
A 2014 case study investigated the relative accumulation efficiency of polycyclic aromatic hydrocarbons (PAHs), total sulfur (S), total nitrogen (N), major and minor elements and Pb isotopes in five common lichen species at three boreal forest sites in the Athabasca Oil Sands Region (AOSR) in northeastern Alberta, Canada to identify the optimum lichen species for future biomonitoring. Differences in concentrations of PAHs, multiple elements, and Pb isotopes in fruticose (Bryoria furcellata, Cladina mitis, Evernia mesomorpha) and foliose (Hypogymnia physodes and Tuckermannopsis americana) lichens were found along a 100 km distance gradient from the primary oil sands operations...
June 10, 2017: Chemosphere
https://www.readbyqxmd.com/read/28633063/serum-perfluoroalkyl-acids-pfaas-and-associations-with-behavioral-attributes
#15
Rebecca Siebenaler, Rochelle Cameron, Craig M Butt, Kate Hoffman, Christopher P Higgins, Heather M Stapleton
The ubiquitous use of poly- and perfluoroalkyl substances (PFASs) in a variety of industrial and consumer products has resulted in chronic exposure in most industrialized nations, and led to measurable concentrations in blood and other tissues in humans across all life stages; however, behavioral attributes that relate to exposure are not well studied. To further investigate how behavior may relate to PFAS exposure, 37 adults were recruited from central North Carolina. Participants provided blood samples and behavioral questionnaires were administered, asking questions about a variety of household, dietary, and behavioral outcomes...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28628904/geochemical-characteristics-of-rare-earth-elements-in-different-types-of-soil-a-chemometric-approach
#16
Aysha Masood Khan, Shima Behkami, Ismail Yusoff, Sharifuddin Bin Md Zain, Nor Kartini Abu Bakar, Ahmad Farid Abu Bakar, Yatimah Alias
Rare earth elements (REEs) are becoming significant due to their huge applications in many industries, large-scale mining and refining activities. Increasing usage of such metals pose negative environmental impacts. In this research ICP-MS has been used to analyze soil samples collected from former ex-mining areas in the depths of 0-20 cm, 21-40 cm, and 41-60 cm of residential, mining, natural, and industrial areas of Perak. Principal component analysis (PCA) revealed that soil samples taken from different mining, industrial, residential, and natural areas are separated into four clusters...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28624741/reduced-sludge-growth-at-high-bulk-liquor-dissolved-oxygen-induced-by-increased-secondary-cell-maintenance
#17
Anwar Khursheed, Vinay Kumar Tyagi, Rubia Z Gaur, Meena Kumari Sharma, Abid Ali Khan, A A Kazmi
Sludge reduction by physico-chemical methods results in the buildup of chemicals, which may require further treatment. Owing these reasons various biologically sustainable methods of sludge reduction including the application of high oxygenation have been successfully tested. Experiments on actual sewage in two lab-scale sequencing batch reactors (SBRs) were conducted under normal (1.5-2.5 mgDO/L) and high dissolved oxygen (DO) (HDO: 3-6.5 mgDO/L) regimes. It was observed that microorganism allocated substrate between maintenance and growth in the form of maintenance coefficient...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28624740/role-of-organic-acids-on-the-bioavailability-of-selenium-in-soil-a-review
#18
REVIEW
Quang Toan Dinh, Zhe Li, Thi Anh Thu Tran, Dan Wang, Dongli Liang
Organic Acids (OAs) are important components in the rhizosphere soil and influence Se bioavailability in soil. OAs have a bidirectional contrasting effect on Se bioavailability. Understanding the interaction of OAs with Se is essential to assessing Se bioavailability in soil and clarifying the role of OAs in controlling the behavior and fate of Se in soil. This review examines the mechanisms for the (im)mobilization of Se by OAs and discusses the practical implications of these mechanisms in relation to sequestration and bioavailability of Se in soil...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28623830/identification-characteristics-and-human-exposure-assessments-of-triclosan-bisphenol-a-and-four-commonly-used-organic-uv-filters-in-indoor-dust-collected-from-shanghai-china
#19
Junjie Ao, Tao Yuan, Yuning Ma, Li Gao, Ni Ni, Dan Li
Indoor dust is a very significant medium to understand human exposure of emerging contaminants. A novel and robust analytical method to measure the amounts of six personal care products (PCPs) (triclosan, bisphenol-A and four commonly used organic ultraviolet (UV) filters) simultaneously in indoor dust is developed in this paper. Target analytes were extracted using accelerated solvent extraction. After sample cleanup by solid-phase extraction (SPE), the extracts were derivatized and analyzed using gas chromatography-tandem mass spectrometry...
June 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/28623829/criteria-for-assessing-the-ecological-risk-of-nonylphenol-for-aquatic-life-in-chinese-surface-fresh-water
#20
Liangmao Zhang, Caidi Wei, Hui Zhang, Mingwei Song
The typical environmental endocrine disruptor nonylphenol is becoming an increasingly common pollutant in both fresh and salt water; it compromises the growth and development of many aquatic organisms. As yet, water quality criteria with respect to nonylphenol pollution have not been established in China. Here, the predicted "no effect concentration" of nonylphenol was derived from an analysis of species sensitivity distribution covering a range of species mainly native to China, as a means of quantifying the ecological risk of nonylphenol in surface fresh water...
June 9, 2017: Chemosphere
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