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Heavy metal screen

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https://www.readbyqxmd.com/read/28933031/screening-isolation-and-molecular-identification-of-biodegrading-mycobacteria-from-iranian-ecosystems-and-analysis-of-their-biodegradation-activity
#1
Davood Azadi, Hasan Shojaei, Sina Mobasherizadeh, Abass Daei Naser
Anthropogenic origin pollutants including pesticides, heavy metals, pharmaceuticals and industry chemicals impose many risks to human health and environment and bioremediation has been considered the strategy of choice to reduce the risk of hazardous chemicals. In the current study, we aimed to screen and characterize mycobacteria from the diverse range of Iranian aquatic and terrestrial ecosystems with harsh and unfavorable environmental conditions that can be utilized for biodegradation of target pollutants...
September 20, 2017: AMB Express
https://www.readbyqxmd.com/read/28914778/screening-for-autochthonous-phytoextractors-in-a-heavy-metal-contaminated-coal-mining-area
#2
Kuangjia Li, Zijian Lun, Lin Zhao, Qilong Zhu, Yansheng Gu, Manzhou Li
In order to protect public health and crops from soil heavy metal (HM) contamination at a coal mining area in Henan, central China, HM pollution investigation and screening of autochthonous HM phytoextractors were conducted. The concentrations of cadmium (Cd), lead (Pb), copper (Cu) and zinc (Zn) in surface soils exceeded the corresponding local background values and the China National Standard (CNS). The maximum potential ecological risk (RI) was 627.30, indicating very high ecological risk. The monomial risk of Cd contributed the most to the RI, varying from 85...
September 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28841996/disposable-sputtered-bismuth-screen-printed-sensors-for-voltammetric-monitoring-of-cadmium-and-lead-in-atmospheric-particulate-matter-samples
#3
M R Palomo-Marín, F Rueda-Holgado, J Marín-Expósito, E Pinilla-Gil
We report here the use of commercial screen-printed disposable sensors comprising a sputtered bismuth working electrode, a silver pseudo reference electrode and a carbon auxiliary electrode (whole set referred as BispSPE), as a new and advantageous alternative for reliable and convenient monitoring of Cd and Pb in atmospheric particulate matter (PM10 fraction) by anodic stripping voltammetry after acid digestion. After a detailed exploration of surface composition and depth profiles of the BispSPE by SEM, EDX, XPS and EIS, chemical and instrumental variables have been optimized to develop a reliable method capable of measuring Cd and Pb with detection limits of 11...
December 1, 2017: Talanta
https://www.readbyqxmd.com/read/28836031/a-field-screening-test-for-the-assessment-of-concentrations-and-mobility-of-potentially-toxic-elements-in-soils-a-case-study-on-urban-soils-from-rome-and-novi-sad
#4
Maria Rita Montereali, Valentina Pinto, Francesca Schiavella, Giovanna Armiento, Massimo Angelone, Cinzia Crovato, Maja Manojlović, Ranko Čabilovski, Carlo Cremisini
The increasing demand for environmental pollution control results in the development and use of new procedures for the determination of dangerous chemicals. Simple screening methods, which can be used directly in the field for a preliminary assessment of soil contamination, seem to be extremely advantageous. In our laboratory, we developed and optimized a rapid test for a preliminary evaluation of both the concentration and the mobility of some potentially toxic metals in soils. This screening test consists of a single extraction of the soil sample with a buffer solution, followed by the titration of the extracted solution with dithizone to determine the contents of bi-valent heavy metals (such as Pb, Cu, Zn, and Cd)...
August 23, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28812956/toxicity-identification-and-evaluation-for-the-effluent-from-a-nonmetallic-mineral-mining-facility-in-korea-using-d-magna
#5
Sungjong Lee, Hongjoo Ha, JinKyung Hong, Guyoung Kang, Chunsang Hong
Industrial wastewater has attracted increasing attention in recent years because of its impact on ecosystems and human health. Whole-effluent tests are generally used to monitor toxicities of unknown chemicals and conventional pollutants from industrial effluent discharges. This study described identification evaluation (TIE) procedures to determine the acute toxicity of a nonmetallic mineral mining facility effluent that was toxic to Daphnia magna. In the characterization step (TIE phase I), toxic effects of heavy metals, organic compounds, oxidants, volatile organic compounds, suspended solids, and ammonia were screened...
January 1, 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28806672/a-novel-approach-for-rapidly-and-cost-effectively-assessing-toxicity-of-toxic-metals-in-acidic-water-using-an-acidophilic-iron-oxidizing-biosensor
#6
Shih-Hung Yang, Kuo-Chih Cheng, Vivian Hsiu-Chuan Liao
Contamination by heavy metals and metalloids is a serious environmental and health concern. Acidic wastewaters are often associated with toxic metals which may enter and spread into agricultural soils. Several biological assays have been developed to detect toxic metals; however, most of them can only detect toxic metals in a neutral pH, not in an acidic environment. In this study, an acidophilic iron-oxidizing bacterium (IOB) Strain Y10 was isolated, characterized, and used to detect toxic metals toxicity in acidic water at pH 2...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28802093/clinical-aspects-of-opium-adulterated-with-lead-in-iran-a-review
#7
Samira Alinejad, Jan Aaseth, Mohammad Abdollahi, Hossein Hassanian-Moghaddam, Omid Mehrpour
Adulteration of drugs with poisonous substances during production or consumption has caused numerous health problems. Among contaminants that have the potential of producing poisonous effects are the heavy metals lead, arsenic and thallium that make up an important group of toxic substances. The emergence of these new health problems related to opioid abuse has precipitated this MiniReview on the status of the most hazardous and common opioid adulterants. In fact, adulterated opium is a major public health problem and can threaten the health of users...
August 12, 2017: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28792450/determination-of-zinc-cadmium-lead-copper-and-silver-using-a-carbon-paste-electrode-and-a-screen-printed-electrode-modified-with-chromium-iii-oxide
#8
Zuzana Koudelkova, Tomas Syrovy, Pavlina Ambrozova, Zdenek Moravec, Lubomir Kubac, David Hynek, Lukas Richtera, Vojtech Adam
In this study, the preparation and electrochemical application of a chromium(III) oxide modified carbon paste electrode (Cr-CPE) and a screen printed electrode (SPE), made from the same material and optimized for the simple, cheap and sensitive simultaneous determination of zinc, cadmium, lead, copper and the detection of silver ions, is described. The limits of detection and quantification were 25 and 80 µg·L(-1) for Zn(II), 3 and 10 µg·L(-1) for Cd(II), 3 and 10 µg·L(-1) for Pb(II), 3 and 10 µg·L(-1) for Cu(II), and 3 and 10 µg·L(-1) for Ag(I), respectively...
August 9, 2017: Sensors
https://www.readbyqxmd.com/read/28772179/artificial-neural-networks-to-evaluate-organic-and-inorganic-contamination-in-agricultural-soils
#9
Maria Grazia Bonelli, Mauro Ferrini, Andrea Manni
The assessment of organic and inorganic contaminants in agricultural soils is a difficult challenge due to the large-scale dimensions of the areas under investigation and the great number of samples needed for analysis. On-site screening techniques, such as Field Portable X-ray Fluorescence (FPXRF) spectrometry, can be used for inorganic compounds, such as heavy metals. This method is not destructive and allows a rapid qualitative characterization, identifying hot spots from where to collect soil samples for analysis by traditional laboratory techniques...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28759788/isolation-of-vanadium-resistance-endophytic-bacterium-pre01-from-pteris-vittata-in-stone-coal-smelting-district-and-characterization-for-potential-use-in-phytoremediation
#10
Liang Wang, Hai Lin, Yingbo Dong, Yinhai He, Chenjing Liu
This study investigates the V-resistant endophytic bacteria isolated from V-accumulator Pteris vittata grown on stone coal smelting district. Among all the ten isolates, the strain PRE01 identified as Serratia marcescens ss marcescens by Biolog GEN III MicroPlate™ was screened out by ranking first in terms of heavy metal resistance and plant growth promoting traits. The S. marcescens PRE01 had strong V, Cr and Cd resistance especially for V up to 1500mg/L. In addition, it exhibited ACC deaminase activity, siderophore production and high indoleacetic acid production (60...
July 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28726294/screening-and-structural-and-functional-investigation-of-a-novel-ferritin-from-phascolosoma-esculenta
#11
Hongwei Ding, Dijun Zhang, Shuangshuang Chu, Jun Zhou, Xiurong Su
Ferritins are primary iron storage proteins and play a crucial role in iron storage and detoxification. Yeast two-hybrid method was employed to screen the cDNA library of Phascolosoma esculenta. Sequence of positive colony FER147 was analyzed. The higher similarity and conserved motifs for ferritin indicated that it belonged to a new member of ferritin family. The interaction between Ferritin and Fer147 was further confirmed through co-immunoprecipitation. The pET-28a-FER147 prokaryotic expression vector was constructed...
October 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28699782/bacterial-siderophores-promote-plant-growth-screening-of-catechol-and-hydroxamate-siderophores
#12
Anna Grobelak, Joanna Hiller
The aim of the study was to determine the quality and quantity of siderophores produced by bacteria isolated from plants' roots. The second aim was to determine the effect of siderophores on plants growth (Festuca rubra L. and Brassica napus L.). The study was carried out using bacteria isolated from roots of: Arabidopsis thaliana L., F. rubra, and Agrostis capillaris L., growing on the heavy metals contaminated area. The chrome azurol sulfonate (CAS) test, Arnow's test for catechol siderophores, and Csaksy's test for hydroxamate siderophores were performed...
September 2, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28683423/heavy-metal-accumulation-in-leaves-and-beans-of-cacao-theobroma-cacao-l-in-major-cacao-growing-regions-in-peru
#13
Enrique Arévalo-Gardini, Cesar O Arévalo-Hernández, Virupax C Baligar, Zhenli L He
Peru is one of the leading exporters of organic cacao beans in the world. However, the accumulation of heavy metals in cacao beans represents a problem for cocoa bean export and chocolate quality. The aim of this study was to investigate the distribution and accumulation of heavy metals in cacao leaves and cocoa beans in three major cacao growing regions of Peru. The study was conducted in cacao plantations of 10 to 15years old in three regions of Peru: North (Regions of Tumbes, Piura, Cajamarca, and Amazonas); Center (Regions of Huánuco and San Martin) and South (Junin and Cuzco)...
December 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28672705/human-health-risk-assessment-and-riskiest-heavy-metal-origin-identification-in-urban-soils-of-yerevan-armenia
#14
Gevorg Tepanosyan, Lilit Sahakyan, Olga Belyaeva, Nairuhi Maghakyan, Armen Saghatelyan
The pollution of urban soils by heavy metals remains a topical issue because of the risks it represents to human health. Heavy metal pollution levels of Yerevan's soils were evaluated using Pollution index and Enrichment factor, while associated health risk was assessed by US EPA model. The heavy metals with significant amount of PI > 1 values were observed for V (100%), Cr (95.4%), Ni (92.5%), Cu (95.6%), Zn (92.9%), Hg (89.0%), Pb (99.9%), As (72.0%), and Ba (61.6% of samples). EF showed that Yerevan topsoils were significantly contaminated with Hg, and moderately contaminated with V, Ni, Cu, Zn, Cr, and As...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28602193/rapid-extraction-and-assay-of-uranium-from-environmental-surface-samples
#15
Christopher A Barrett, Wilaiwan Chouyyok, Robert J Speakman, Khris B Olsen, Raymond Shane Addleman
Environmental sampling to detect trace nuclear signatures is key component of international nuclear treaty enforcement. Herein, we explored rapid chemical extraction methods coordinated with measurement systems to provide faster, simpler assay of low level uranium from environmental samples. A key problem with the existing analytical method for processing environmental surface samples is the requirement for complete digestion of sample and sampling material. This is a time-consuming and labor-intensive process that limits laboratory throughput, elevates analytical costs, and increases background levels...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28511314/-determination-of-cadmium-in-human-urine-by-colloidal-gold-immunochromatographic-assay
#16
G Y Fu, J Gong, X X Leng
Objective: To establish the method of colloidal gold immunochrom atographic assay for detecting cadmium ions rapidly. Methods: The anti-cadmium ion monoclonal antibody-gold conjugate was labeled on the binding pad, cadmium ion hapten and goat anti-mouse IgG were coated on nitrocellulose membrane as the detection line (T line) and quality control line (C line) respectively. The sample pad, colloidal gold bonding pad, nitrocellulose membrane and absorption pad were orderly assembled on the PVC board to cut into a test paper strip...
March 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/28467056/easy-preparable-butyrylcholinesterase-microgel-construct-for-facilitated-organophosphate-biosensing
#17
Larisa V Sigolaeva, Snezhana Yu Gladyr, Olga Mergel, Arjan P H Gelissen, Michael Noyong, Ulrich Simon, Dmitry V Pergushov, Ilya N Kurochkin, Felix A Plamper, Walter Richtering
A versatile guest matrix was fabricated from a temperature- and pH-sensitive poly(N-isopropylacrylamide)-co-(3-(N,N-dimethylamino)propylmethacrylamide) microgel (poly(NIPAM-co-DMAPMA), MG) for the gentle incorporation of butyrylcholinesterase (BChE). The microgel/BChE films were built up on a surface of graphite-based screen-printed electrodes (SPEs) premodified with MnO2 nanoparticles via a two-step sequential adsorption under careful temperature and pH control. On this basis, a rather simple amperometric biosensor construct was formed, which uses butyrylthiocholine as BChE substrate with subsequent MnO2-mediated thiocholine oxidation at a graphite-based SPE...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28467055/microfluidic-technology-uncovering-the-mechanisms-of-nanocrystal-nucleation-and-growth
#18
Ioannis Lignos, Richard Maceiczyk, Andrew J deMello
The controlled and reproducible formation of colloidal semiconductor nanocrystals (or quantum dots) is of central importance in nanoscale science and technology. The tunable size- and shape-dependent properties of such materials make them ideal candidates for the development of efficient and low-cost displays, solar cells, light-emitting devices, and catalysts. The formidable difficulties associated with the macroscale preparation of semiconductor nanocrystals (possessing bespoke optical and chemical properties) result from the fact that underlying reaction mechanisms are complex and that the reactive environment is difficult to control...
May 3, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28441590/screening-arabidopsis-mutants-in-genes-useful-for-phytoremediation
#19
María Sanz-Fernández, María Rodríguez-Serrano, Ana Sevilla-Perea, Liliana Pena, M Dolores Mingorance, Luisa M Sandalio, María C Romero-Puertas
Emissions of heavy metals have risen over the past 200 years and significantly exceed those from natural sources. Phytoremediation strategies may be able to recover soil productivity in self-sustaining ecosystems; however, our knowledge of the molecular mechanisms involved in plant heavy-metal perception and signalling is scarce. The aim of this study was to assemble a "molecular tool box" of genes useful for phytoremediation. To identify mutants with different heavy-metal-tolerance, we first selected a medium from mixtures containing three metals based on their presence in two Spanish mining areas and then screened about 7000 lines of Arabidopsis T-DNA mutants and found 74 lines more resistant and 56 more susceptible than the wild type (WT)...
April 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28414730/elements-including-metals-in-the-atomizer-and-aerosol-of-disposable-electronic-cigarettes-and-electronic-hookahs
#20
Monique Williams, Krassimir Bozhilov, Sanjay Ghai, Prue Talbot
OBJECTIVE: Our purpose was to quantify 36 inorganic chemical elements in aerosols from disposable electronic cigarettes (ECs) and electronic hookahs (EHs), examine the effect of puffing topography on elements in aerosols, and identify the source of the elements. METHODS: Thirty-six inorganic chemical elements and their concentrations in EC/EH aerosols were determined using inductively coupled plasma optical emission spectroscopy, and their source was identified by analyzing disassembled atomizers using scanning electron microscopy and energy dispersive X-ray spectroscopy...
2017: PloS One
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