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https://www.readbyqxmd.com/read/29903189/-colorimetric-detection-of-trace-mercury-in-mineral-water-via-cloud-pointextraction-coupled-with-gold-nanoparticle-probe
#1
Zheng Wang, Xiaowei Wang, Ying Xue, Rong Zhao, Rencai Luo, Dong Chen
OBJECTIVE: To developed a method for rapid visual and colorimetric detection of trace high toxicity element mercury( Hg~(2+)) in natural mineral water via coupling cloud-point extraction with gold nanoparticle probe. METHODS: The concentration of Hg~(2+)was quantified via the color degree of the Triton X-114 phase. The functionalized gold nanoparticle probe was synthesized and purified. 200 μL gold nanoparticle probe was added into 10 mL water sample( pH 7. 5), coupled with 400 μL, 5 % Triton X-114 solution...
July 2017: Wei Sheng Yan Jiu, Journal of Hygiene Research
https://www.readbyqxmd.com/read/29902771/a-non-invasive-spectroscopic-study-to-evaluate-both-technological-features-and-conservation-state-of-two-types-of-ancient-roman-coloured-bricks
#2
C Scatigno, N Prieto-Taboada, M Preite Martinez, A M Conte, J M Madariaga
The study of both original and decaying compounds is relevant in understanding the chemistry behind the deterioration processes, above all in open museum contexts where environmental stressors affect the artefacts. In this sense, a combination of non-invasive spectroscopy techniques (Raman spectroscopy, μ-X-ray fluorescence and X-ray diffraction) was applied on an ancient Roman building (130 CE), the "Casa di Diana" Mithraeum at Ostia Antica archaeological site. The aim is to study the raw materials, manufacturing and decaying products of the two observed types of Roman fired bricks (red and yellow) that compose the building...
June 7, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29898524/microbial-adaptation-to-long-term-n-supply-prevents-large-responses-in-n-dynamics-and-n-losses-of-a-subtropical-forest
#3
Xiaoge Han, Weijun Shen, Jinbo Zhang, Christoph Müller
Atmospherically-deposited nitrogen (N) can stimulate complex soil N metabolisms and accumulations over time. Whether long-term (decadal) N deposition effects on soil N transformations and functional microbes differ from the short-term (annual) effects has rarely been assessed. Here we conducted a laboratory 15 N tracing study with soil samples from a short-term (one year) N addition site and a long-term (12 years) site in a subtropical forest. The effects of simulated N deposition on soil N2 O emissions, N transformation rates and microbial nitrifying and denitrifying genes were determined...
June 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29896639/natural-and-anthropic-processes-controlling-groundwater-hydrogeochemistry-in-a-tourist-destination-in-northeastern-brazil
#4
Jonatas Batista Mattos, Manoel Jerônimo Moreira Cruz, Francisco Carlos Fernandes De Paula, Elinaldo Fonseca Sales
The objective of this study was to analyze spatial-seasonal changes to identify the natural and anthropic processes that control groundwater hydrogeochemistry in urban aquifers in municipality of Lençóis (Bahia). Tourism is the main activity of this municipality, which is an important tourist destination in northeastern Brazil and which maintains its tourism infrastructure by using groundwater. Two field campaigns were conducted (dry and rainy seasons) in order to collect groundwater samples extracted from 15 tubular wells distributed over the urban area of the municipality...
June 12, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29896509/distribution-of-major-and-trace-elements-in-koppunuru-area-guntur-district-andhra-pradesh-india
#5
K Arumugam, S Srinivasalu, R Purvaja, R Ramesh
From koppunuru study area totally 58 samples were collected in 7 different boreholes, minimum depth of 28 m and Maximum depth of 157.7 m. The borehole samples geochemical analysis (major and trace elements) was carried out at Atomic Minerals Directorate for Exploration & Research (AMD), Hyderabad, India. Major and trace element studies have been conducted on the Neoproterozoic Palnad sub-basin Andhra Pradesh, South India, to determine their Geochemistry, Uranium mineralization and provenance characteristics...
June 2018: Data in Brief
https://www.readbyqxmd.com/read/29895368/validation-of-a-dilute-and-shoot-method-for-quantification-of-12-elements-by-inductively-coupled-plasma-tandem-mass-spectrometry-in-human-milk-and-in-cow-milk-preparations
#6
Stéphane Dubascoux, Daniel Andrey, Mario Vigo, Peter Kastenmayer, Eric Poitevin
Nutritional information about human milk is essential as early human growth and development have been closely linked to the status and requirements of several macro- and micro-elements. However, methods addressing whole mineral profiling in human milk have been scarce due in part to their technical complexities to accurately and simultaneously measure the concentration of micro- and macro-trace elements in low volume of human milk. In the present study, a single laboratory validation has been performed using a "dilute and shoot" approach for the quantification of sodium (Na), magnesium (Mg), phosphorus (P), potassium (K), calcium (Ca), manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), selenium (Se), molybdenum (Mo) and iodine (I), in both human milk and milk preparations...
September 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29895367/development-validation-and-application-of-an-icp-ms-ms-method-to-quantify-minerals-and-ultra-trace-elements-in-human-serum
#7
Sören Meyer, Mariya Markova, Gabriele Pohl, Talke A Marschall, Olga Pivovarova, Andreas F H Pfeiffer, Tanja Schwerdtle
Multi-element determination in human samples is very challenging. Especially in human intervention studies sample volumes are often limited to a few microliters and due to the high number of samples a high-throughput is indispensable. Here, we present a state-of-the-art ICP-MS/MS-based method for the analysis of essential (trace) elements, namely Mg, Ca, Fe, Cu, Zn, Mo, Se and I, as well as food-relevant toxic elements such as As and Cd. The developed method was validated regarding linearity of the calibration curves, method LODs and LOQs, selectivity and trueness as well as precision...
September 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29890600/photodegradation-of-river-dissolved-organic-matter-and-trace-metals-in-the-largest-european-arctic-estuary
#8
Anna A Chupakova, Artem V Chupakov, Natalia V Neverova, Liudmila S Shirokova, Oleg S Pokrovsky
Photo-induced degradation of dissolved organic matter (DOM) and organo-mineral colloids is one of the major factor responsible for transformation of DOM and dissolved metals in boreal and subarctic waters. In contrast to fairly good understanding of this process in inland waters of high latitude zone, the transformation of riverine DOM and associated trace element (TE) colloids in the Arctic estuaries remains virtually unknown. We incubated, under sunlight in outdoor pools, quartz reactors filled with mixtures of sterile filtered riverine and estuarine water...
May 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29886969/an-environmental-magnetism-approach-to-assess-impacts-of-land-derived-sediment-disturbances-on-coral-reef-ecosystems-cartagena-colombia
#9
Daniela Mejia-Echeverry, Marcos A E Chaparro, José F Duque-Trujillo, Juan D Restrepo
We used environmental magnetism methods to study recently deposited marine sediments from the estuarine ecosystems on the Caribbean coast of Colombia. Cartagena region has undergone an increasing sediment load during the last decades via sediment plumes from Magdalena River and its distributary man-made channel. Concentration dependent magnetic parameters show an increasing abundance of ferrimagnetic minerals on the uppermost sediments on sites located close to the continent (remanent magnetization SIRM = 5...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886963/baseline-study-on-trace-and-rare-earth-elements-in-marine-sediments-collected-along-the-namibian-coast
#10
Anna Maria Orani, Emilia Vassileva, Irena Wysocka, Michael Angelidis, Martina Rozmaric, Deon Louw
Namibia is a fast-growing country with extensive mineral extraction activities used in diamond, fluorspar, uranium, and metals production. To assess the impact of land based human activities on the Namibian coastal marine environment, 25 elements were analyzed in 22 surface sediments samples collected along the coast. After applying a variety of pollution assessment indices (Enrichment Factor, Igeo and Pollution Load Indexes) was concluded that As, Cd and Sb were considerably enriched in the sediments from several sites, while Cu, Pb and Zn showed very high enrichment near the Walvis Bay harbor...
June 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29886315/chemical-and-ecotoxicological-effects-of-the-use-of-drinking-water-treatment-residuals-for-the-remediation-of-soils-degraded-by-mining-activities
#11
P Alvarenga, C Ferreira, C Mourinha, P Palma, A de Varennes
The aim of this study was to evaluate the use of drinking-water treatment residuals (DWTR) in the amendment of a soil affected by mining activities (Aljustrel mine, Portuguese sector of the Iberian Pyrite Belt), considering the effects on its chemical, biochemical and ecotoxicological characteristics. The DWTR had neutral characteristics (pH 6.7) and an organic matter (OM) content of 575 g kg-1 dry matter (DM), which makes them a potential amendment for the remediation of mine degraded soils, as they may correct soil acidity and reduce the extractable metal fraction...
June 7, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29883865/chemometric-tool-to-study-the-mechanism-of-arsenic-contamination-in-groundwater-of-puducherry-region-south-east-coast-of-india
#12
M Sridharan, D Senthil Nathan
To understand occurrence, distribution and source of arsenic, 175 groundwater samples from coastal aquifers of the Puducherry region were collected and analyzed for major ions and trace metals. The concentration of As in groundwater of study area ranges from not detectable - 28.88 μg/L during the post-monsoon and not detectable - 36.88 μg/L in the pre-monsoon. The desirable limit for As in groundwater is 10 μg/L as per World Health Organization and Bureau of Indian standard. About 13.64 and 11.50% of groundwater samples shows arsenic concentration higher than recommended limit...
May 31, 2018: Chemosphere
https://www.readbyqxmd.com/read/29878195/nanosims-imaging-of-extracellular-electron-transport-processes-during-microbial-iron-iii-reduction
#13
Laura Newsome, Rebeca Lopez Adams, Helen F Downie, Katie L Moore, Jonathan R Lloyd
Microbial iron(III) reduction can have a profound effect on the fate of contaminants in natural and engineered environments. Different mechanisms of extracellular electron transport are used by Geobacter and Shewanella spp. to reduce insoluble Fe(III) minerals. Here we prepared a thin film of iron(III)-(oxyhydr)oxide doped with arsenic, and allowed the mineral coating to be colonised by Geobacter sulfurreducens or Shewanella ANA3 labelled with 13C from organic electron donors. This preserved the spatial relationship between metabolically active Fe(III)-reducing bacteria and the iron(III)-(oxyhydr)oxide that they were respiring...
June 6, 2018: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29874734/are-cu-isotopes-a-useful-tool-to-trace-metal-sources-and-processes-in-acid-mine-drainage-amd-context
#14
Jérôme Viers, Jose Antonio Grande, Cyril Zouiten, Rémi Freydier, Jérémy Masbou, Teresa Valente, Maria-Luisa de la Torre, Christine Destrigneville, Oleg S Pokrovsky
In the South-West Europe (Iberian Pyrite Belt), acid mine drainage (AMD) processes are especially problematic because they affect the environmental quality of watersheds, restricting the use of surface water. Recent studies have shown that Cu isotopes are fractionated during the oxidative dissolution of primary sulfide minerals and could be used to trace metal cycling. However the chemistry of Cu in such environment is complex because Cu is redistributed within numerous secondary minerals and strongly dependent on the hydroclimatic conditions that control key parameters (pH, redox conditions)...
February 2018: Chemosphere
https://www.readbyqxmd.com/read/29872982/evaluation-of-the-uv-h-2-o-2-system-for-treating-natural-water-with-a-mixture-of-anthracene-and-benzo-a-pyrene-at-ultra-trace-levels
#15
Ainhoa Rubio-Clemente, Edwin Chica, Gustavo Peñuela
The presence of polycyclic aromatic hydrocarbons, such as anthracene (AN) and benzo[a]pyrene (BaP), in water has become a problem of great concern due to the detrimental health effects caused to humans and living beings. In this work, the efficiency of the UV/H2 O2 system for degrading the target compounds at ultra-trace levels in surface water has been evaluated. For this purpose, a previous optimization step using a face-centered central composite experimental design has been conducted, considering the effect of the UV-C irradiance and the initial concentration of H2 O2 ...
June 5, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29850968/are-there-as-many-essential-and-non-essential-minerals-in-hydroponic-strawberry-fragaria-ananassa-l-compared-to-those-grown-in-soil
#16
Seong Hwa Jeon, Saranya Kuppusamy, Young-Eun Yoon, Hyeon Tae Kim, Yong Bok Lee
The present study aims to compare the contents of minerals (essential major-K, Ca, Mg, Na, P, S; essential trace-Fe, Mn, Zn, Cu, B, Mo, As, Se, Ni, V, Cr, Co; non-essential-Sn, Ga, Li, Be, Rb, Sr, Al, Pd, Cd, Hg, Pb, Ge) in strawberry (stem, leaf, and fruit) cultivated in two different cultivation systems, soil and hydroponic. The concentrations of 30 minerals in the acid-digested strawberry samples were determined by ICP-MS and ICP-OES. Hydroponic strawberry (leaf > fruit > stem) indicated higher values for most minerals which were below the plant toxicity levels...
May 30, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29846680/influence-of-trace-mineral-sources-on-broiler-performance-lymphoid-organ-weights-apparent-digestibility-and-bone-mineralization
#17
Shawkat A M'Sadeq, Shu-Biao Wu, Mingan Choct, Robert A Swick
This experiment was conducted to examine the effect of trace mineral sources on broiler performance, carcass composition, trace mineral digestibility, and tibia bone quality of broiler chickens. A total of 480 Ross 308 male day-old chicks were allocated to 24 pens and assigned to 4 dietary treatments in a completely randomized design. Treatments were as follows: inorganic (I) was basal diet supplemented with 750 g/t inorganic trace mineral premix; organic 1 (O1) and organic 2 (O2) was basal diet supplemented with 375 and 500 g/t organic yeast proteinate trace mineral premix respectively; and hydroxychloride (H) was basal diet supplemented with 1000 g/t salt encrusted trace mineral premix...
May 26, 2018: Poultry Science
https://www.readbyqxmd.com/read/29806459/influence-of-oxalate-on-ni-fate-during-fe-ii-catalyzed-recrystallization-of-hematite-and-goethite
#18
Elaine Flynn, Jeffrey G Catalano
During biogeochemical iron cycling at redox interfaces, dissolved Fe(II) induces the recrystallization of Fe(III) oxides. Oxalate and other organic acids promote dissolution of these minerals and may also induce recrystallization. These processes may redistribute trace metals among the mineral bulk, mineral surface, and aqueous solution. However, the impact of interactions among organic acids, dissolved Fe(II), and iron oxide minerals on trace metal fate in such systems is unclear. The present study thus explores the effect of oxalate on Ni release from and incorporation into hematite and goethite in the absence and presence of Fe(II)...
May 28, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29806144/buchanania-obovata-an-australian-indigenous-food-for-diet-diversification
#19
Selina A Fyfe, Michael E Netzel, Ujang Tinggi, Eva M Biehl, Yasmina Sultanbawa
AIM: Buchanania obovata Engl., the Green Plum, is a small green fruit eaten by Australian Indigenous peoples of the Northern Territory and Western Australia that has had limited study and has potential as a source of food for diet diversification. The flesh and seed of the fruit are eaten and the plant is used as bush medicine. METHODS: Physical characteristics of the fruit were measured. The flesh and seed freeze dried powders were measured separately for proximates, mineral/trace elements and heavy metals, and folate analysis...
May 27, 2018: Nutrition & Dietetics: the Journal of the Dietitians Association of Australia
https://www.readbyqxmd.com/read/29802608/trace-element-contaminants-in-mineral-fertilizers-used-in-iran
#20
Zahra Latifi, Mohsen Jalali
The application of mineral fertilizers which have contaminants of trace elements may impose concern regarding the entry and toxic accumulation of these elements in agro-ecosystems. In this study, 57 mineral fertilizers (nitrogen, potassium, phosphate, and compound fertilizers) distributed in Iran were analyzed for their contents of Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn, and Fe. The results revealed that the contents of these trace elements varied considerably depending on the type of the element and the fertilizer...
May 25, 2018: Environmental Science and Pollution Research International
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