Search results for "POLLUTION"

showing 10 items of 2765 documents

Anwendung der Glas Carbon Elektrode für die Quecksilberbestimmung in Flußwasser mittels der Differential-Puls inversen Voltammetrie (DPAW)

1979

Abstract The Glassy Carbon Electrode was used for Mercury determination in “synthetic solutions” as well as in river water by stripping Voltammetry. Best results were obtained with a supporting electrolyte of the chemical composition 0.1m KSCN, 0.025 n HCl and 20ng/mlCu2+. The optimal pH was found to be 2.8 and the optimal deposition potential-1.0 volt. It is possible to determine at to 1.5ppb Hg2+ in river watersamples. Es wurde die Glas Carbon Elektrode benutzt, urn Quecksilber sowohl in “synthetischen Losungen” als auch in Fluswasser invers-voltammetrisch zu bestimmen. Fur die Bestimmung hat sich ein Grundelektrolyt der Zusammensetzung 0.1m KSCN, 0.025 n HCl und 20ng/ml Cu2+ gut bewahrt.…

ChemistryHealth Toxicology and MutagenesisPublic Health Environmental and Occupational HealthSoil ScienceEnvironmental Chemistrychemistry.chemical_elementPollutionWaste Management and DisposalWater Science and TechnologyAnalytical ChemistryMercury (element)Nuclear chemistryInternational Journal of Environmental Analytical Chemistry
researchProduct

Determination of gunshot residues by neutron activation analysis

1973

Systematic investigations of gunshot residues, deposited around the bullet hole, have been carried out. The traces were produced by firing on filter papers from distances of 5 to 200 cm using one rifle and three pistols as arms. Antimony, lead and barium were quantitatively determined after irradiating the samples in the nuclear reactor TRIGA Mainz by measurement of gamma-lines of122mSb,122Sb,207mPo and139Ba. The determinations were made purely instrumentally and-where the half lives were long enough-also after chemical separation of the nuclides. The amount of the elements were determined in dependence of the firing distance and of the area around the bullet hole.

ChemistryHealth Toxicology and MutagenesisRadiochemistryPublic Health Environmental and Occupational HealthAnalytical chemistrychemistry.chemical_elementBariumNuclear reactorPollutionAnalytical Chemistrylaw.inventionTRIGAChemical separationNuclear Energy and EngineeringAntimonylawRadiology Nuclear Medicine and imagingNuclideNeutron activation analysisSpectroscopyJournal of Radioanalytical Chemistry
researchProduct

Sicilian bottled natural waters: Major and trace inorganic components

2013

Sixteen bottled waters of various Sicilian brands, 11 natural mineral waters and five normal drinking waters, were analyzed for major and trace inorganic components by ion chromatography (IC) and inductively coupled plasma-mass spectrometry (ICP-MS), respectively. The bottled waters represent a variety of water types with significantly different compositions in terms of salinity, major components and trace elements. Chemically, they range from Ca–HCO3 and Ca–SO4 to Na–HCO3 types. Total dissolved solids ranges from 54 to 433 mg/L, total hardness from 25 to 238 mg/L CaCO3, and measured Na content from 5.7 to 57 mg/L. According to total dissolved ions, all the bottled waters were classified as…

ChemistryIon chromatographyBottled waterMass spectrometryTotal dissolved solidsPollutionSettore GEO/08 - Geochimica E VulcanologiaSalinityNutrientGeochemistry and PetrologyEnvironmental chemistryEnvironmental ChemistryWater qualitybottled natural waters major and trace elements municipal watersChemical compositionApplied Geochemistry
researchProduct

UV-Filtersubstanzen in Wasser und Fischen

1997

Zur Erfassung der UV-Filtersubstanzen wird eine Methode vorgestellt, die die simultane Bestimmung dieser Verbindungen und von Organochlorverbindungen wie PCB und DDT in unterschiedlichen Fischkompartimenten bis in den ng/kg-Bereich ermoglicht. Die Nachweisgrenzen liegen zwischen 40 und 90 ng/kg Filet und die Wiederfindungsraten bewegen sich zwischen 78 und 104%. Die Belastung von Wasser und Fischen des Meerfelder Maares, Eifel, mit UV-Filtersubstanzen wurde 1991 und 1993 exemplarisch untersucht. Insgesamt konnten in den Fischen des Meerfelder Maares 6 UV-Filtersubstanzen identifiziert und quantifiziert werden. Die im Sommer 1991 gefangenen Barsche waren mit 2,0 mg/kg Fett (Summe nachgewiese…

ChemistryPollutionMolecular biologyUmweltwissenschaften und Schadstoff-Forschung
researchProduct

Bestimmung von Nitrodiphenylaminen und verwandten Verbindungen im Sickerwasser einer Rüstungsaltlast

2005

Die Produktion des Sprengstoffes 2,2′, 4,4′,6,6′-Hexanitrodiphenylamin (Hexyl) und der Einsatz von Diphenylamin als Stabilisator fur rauchlose Pulver kann zu einem Eintrag von Nitrodiphenylaminen in die Umwelt gefuhrt haben. Ziel dieser Arbeit ist die Prasentation von HPLC-Methoden zur Trennung der auf diesen Flachen insbesondere im aeroben Bereich zu erwartenden Kontaminanten und die Erprobung dieser Verfahren an Sickerwasserproben eines Rustungsaltstandortes. Das zu erwartende Stoffspektrum wurde aus Literaturstudien abgeleitet. Es wurde eine Liste von 13 Substanzen erstellt, fur die HPLC-Methoden prasentiert werden. Weiterhin wurde das Sickerwasser eines ehemaligen Explosivstoffwerkes mi…

ChemistryPollutionMolecular biologyUmweltwissenschaften und Schadstoff-Forschung
researchProduct

Schwermetalle und organische Umweltchemikalien in Rehwild (Capreolus capreolus L.) aus Forst- und Agrarstandorten

1994

Rehwild eignet sich als Indikator fur die flachenhafte Kontamination von Lebensraumen mit Umweltchemikalien. An funf Forst- bzw. Agrarstandorten in Rheinland-Pfalz wurde der Einflus der Nutzungsart (Wald, Agrarflache, Weinbau) auf die Kontamination der Okosysteme aufgezeigt. Die Schwermetalle Blei und Cadmium wurden im Nierengewebe gemessen, die organischen Umweltchemikalien PCB, α-HCH, γ-HCH (Lindan), DDT und DDE in Nieren und Leber und auf den Fettgehalt der Organe bezogen. Die Untersuchung fuhrte zu folgenden Ergebnissen: Blei: Die Bleigehalte der Nierenproben aus den verschiedenen Standorten weisen auf eine allgemeine geringe Hintergrundbelastung der Okosysteme hin. Cadmium: Fur Cadmium…

ChemistryPollutionMolecular biologyUmweltwissenschaften und Schadstoff-Forschung
researchProduct

Preparation and characterization of organofunctionalized bentonite clay bearing aminophosphonic groups in heavy metal uptake

2019

Abstract Bentonite (Bnt) with covalently immobilized N-propylaminodi(methylenephosphonic) groups (Bnt-ADPA) was obtained through a two-step synthesis including aminosilanization and phosphorylation of resulting aminobentonite through Moedritzer-Irani reaction. The grafting of an aminosilane layer in the interplanar space of the bentonite was investigated by XRD, and the presence of N and P-containing groups was confirmed by FTIR, 31P and 29Si MAS NMR. The immobilization of the organic functional groups increased the interplanar distance in bentonite matrix at 52% that essentially improved filtration properties compared to raw bentonite. The number of surface acid groups was evaluated to 0.8…

ChemistryProcess Chemistry and TechnologyMetal ions in aqueous solution02 engineering and technology010501 environmental sciences021001 nanoscience & nanotechnologyGrafting01 natural sciencesPollutionMatrix (chemical analysis)MetalAdsorptionCovalent bondvisual_artBentonitevisual_art.visual_art_mediumChemical Engineering (miscellaneous)Fourier transform infrared spectroscopy0210 nano-technologyWaste Management and Disposal0105 earth and related environmental sciencesNuclear chemistryJournal of Environmental Chemical Engineering
researchProduct

The toxicity of MCPA to fish. Light and electron microscopy and the chemical analysis of the tissue.

1978

ChemistryTroutHealth Toxicology and MutagenesisGeneral Medicine2-Methyl-4-chlorophenoxyacetic AcidToxicologyPollutionMCPAlaw.inventionGlycolateschemistry.chemical_compoundLiverlawEnvironmental chemistryToxicityEcotoxicologyFish <Actinopterygii>AnimalsElectron microscopeSalmonidaeBulletin of environmental contamination and toxicology
researchProduct

Improving the photocatalytic H2 evolution activity of Keggin polyoxometalates anchoring copper-azole complexes

2021

Eliminating the use of precious metals as cocatalysts and using visible light are two important aspects in the field of photocatalytic H2 evolution with polyoxometalates (POMs) as photosensitizers. Here we present two new POM-based materials: [CuII5(2-ptz)6(H2O)4(GeW12O40)]·4H2O (1) and [CuI2(ppz)4][H2GeW12O40]·8H2O (2) (2-ptz = 5-(2-pyridyl) tetrazole, ppz = 3-(pyrid-4-yl) pyrazole) synthesized with the Keggin type [GeW12O40]4− (GeW12) polyanion and copper-azole complexes. The optimum photocatalytic H2 evolution rate of compound 1 without a noble metal cocatalyst is 3813 μmol g−1 h−1, which is 7.6 times higher than that of compound 2 and more than 27 times higher than that of bare GeW12 po…

Chemistrychemistry.chemical_elementengineering.materialPyrazolePhotochemistryPollutionCopperchemistry.chemical_compoundPhotocatalysisengineeringEnvironmental ChemistryNoble metalTetrazolePhotosensitizerDispersion (chemistry)Visible spectrumGreen Chemistry
researchProduct

Association between residential proximity to environmental pollution sources and childhood renal tumors

2016

FI=3.835 (año 2016), Q1 Background: Few risk factors for childhood renal tumors are well established. While a small fraction of cases might be attributable to susceptibility genes and congenital anomalies, the role of environmental factors needs to be assessed. Objectives: To explore the possible association between residential proximity to environmental pollution sources (industrial and urban areas, and agricultural crops) and childhood renal cancer, taking into account industrial groups and toxic substances released. Methods: We conducted a population-based case-control study of childhood renal cancer in Spain, including 213 incident cases gathered from the Spanish Registry of Childhood T…

Childhood renal tumorsMaleAdolescentIndustrial pollutionPopulationCropsEnvironmental pollution010501 environmental sciencesUrban pollutionLogistic regression01 natural sciencesBiochemistry03 medical and health sciences0302 clinical medicineEnvironmental healthResidential proximityOdds RatioHumansRisk factorChildeducationSocioeconomic status0105 earth and related environmental sciencesGeneral Environmental Scienceeducation.field_of_studyAbsolute risk reductionInfantCase-control studyOdds ratioKidney NeoplasmsGeographySpainCase-Control StudiesChild Preschool030220 oncology & carcinogenesisFemaleResidenceEnvironmental PollutionEnvironmental Research
researchProduct