Search results for "Inductively coupled plasma"

showing 10 items of 188 documents

Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
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A comparative study on sample preparation procedures for supplementary foods by ICP-OES: Green chemistry considerations

2015

An inductively coupled plasma optical emission (ICP-OES) method was developed for the simultaneous determination of major, minor and trace elements in food. Preliminary studies focused on selecting suitable operational conditions in order to provide the highest sensitivity and to maximize the number of analytes to be determined without spectral or matrix interference. Ruthenium and rhenium were evaluated as internal standards and samples were analyzed at different dilution levels. Furthermore, a comparative study was carried out by using three sample digestion methods, microwave-assisted digestion with HNO3/H2O2, dry ashing and dry ashing with Mg(NO3)2/MgO as an ashing aid. Adequate precisi…

Accuracy and precisionAnalyteChromatographyChemistryGeneral Chemical EngineeringGeneral EngineeringAnalytical chemistryAnalytical ChemistryDilutionCertified reference materialsAshingInductively coupled plasma atomic emission spectroscopySample preparationInductively coupled plasmaAnalytical Methods
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Producing SI-traceable reference values for Cd, Cr and Pb amount contents in polyethylene samples from the Polymer Elemental Reference Material (PERM…

2000

The present paper describes the certification of the amount content of Cd, Cr and Pb in two different polyethylene materials within the third phase of the Polyethylene Elemental Reference Material (PERM) project. The analytical procedure to establish the reference values for Cd, Cr and Pb amount contents in these materials is based on isotope dilution mass spectrometry used as a primary method of measurement. Cd and Pb were measured with inductively coupled plasma-mass spectrometry and Cr with positive thermal ionization-mass spectrometry. The decomposition of the polymer matrix was carried out using a high pressure asher. Reference values for amount content, traceable to the SI-system, hav…

Accuracy and precisionGeneral Chemical EngineeringAnalytical chemistrychemistry.chemical_elementGeneral ChemistryIsotope dilutionPolyethyleneMass spectrometryMatrix (chemical analysis)Chromiumchemistry.chemical_compoundThird phasechemistrySafety Risk Reliability and QualityInstrumentationInductively coupled plasma mass spectrometryAccreditation and Quality Assurance
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230Th/U-dating of a late Holocene low uranium speleothem from Cuba

2010

We present 22 U-series ages for a stalagmite from north-western Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ~1400a. Low uranium content of the sample and thus, extremely low 230Th concentrations limit the precision and accuracy of 230Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232Th content along the growth axis with some sections significantly affected by initial 230Th from a detrital phase. An a-priori bulk earth ratio for (238U/232Th) cannot be used to accurately account for this initial 230Th.…

Accuracy and precisiongeographygeography.geographical_feature_categoryMineralogyThermal ionizationSpeleothemchemistry.chemical_elementStalagmiteUraniumMass spectrometrychemistryInductively coupled plasma mass spectrometryGeologyHoloceneIOP Conference Series: Earth and Environmental Science
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Room temperature acid sonication ICP-MS multielemental analysis of milk

2005

Abstract Room temperature acid sonication of milk samples is proposed as a fast alternative methodology for the determination of the total content of 45 elements (Li, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Rb, Sr, Y, Mo, Ag, Cd, In, Sn, U, Sb, Te, Cs, Ba, Hg, Pb, Bi, Th, La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Hf and Ta) in milk by inductively coupled plasma mass spectrometry (ICP-MS). The aforementioned procedure involves a 10 min sample pre-treatment. Measurements were made in quantitative and semiquantitative (Totalquant ® ) modes of analysis using Rh as internal standard and Be, Ge, Tb and Re for internal calibration of the equipment in the semiquantitative mode. The…

Acid digestionIsotopeChemistrySonicationPolyatomic ionAnalytical chemistryMass spectrometryBiochemistryAnalytical ChemistryEnvironmental ChemistryIsobaric processDirect analysisInductively coupled plasma mass spectrometrySpectroscopyAnalytica Chimica Acta
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Application of LA-ICP-MS as a rapid tool for analysis of elemental impurities in active pharmaceutical ingredients.

2014

The control of inorganic contaminants in active pharmaceutical ingredients has a significant role in the quality control of drug products. The concentration limits for metal residues in drug products have been defined by various regulatory guidelines. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is a powerful and fast analytical technique for multi-elemental analysis. A disadvantage in using LA-ICP-MS method is the lack of matrix reference materials for validation and calibration purposes. This article focuses on the handling strategy of laboratory-made matrix calibration standards for the quantification of elemental impurities in an active pharmaceutical ingredie…

Active ingredientChromatographyChemistryLaser ablation inductively coupled plasma mass spectrometryClinical BiochemistryAnalytical techniqueAnalytical chemistryPharmaceutical ScienceAnalytical ChemistryMatrix (chemical analysis)Pharmaceutical PreparationsLa icp msSpectrometry Mass Matrix-Assisted Laser Desorption-IonizationDrug DiscoveryCalibrationInorganic contaminantsElemental impuritiesDrug ContaminationSpectroscopyJournal of pharmaceutical and biomedical analysis
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Gel Electrophoresis Coupled to Inductively Coupled Plasma−Mass Spectrometry Using Species-Specific Isotope Dilution for Iodide and Iodate Determinati…

2007

In this paper, we present an online coupling of gel electrophoresis (GE) and inductively coupled plasma-mass spectrometry (ICP-MS) for the determination of iodine species (iodide and iodate) in liquid (seawater) and aerosol samples. For the first time, this approach is applied to the analysis of small molecules, and initial systematic investigations revealed that the migration behavior as well as the detection sensitivity strongly depends on the matrix (e.g., high concentrations of chloride). These effects could consequently affect the accuracy of analytical results, so that they need to be considered for the analysis of real samples. The technique used for quantification is species-specifi…

AerosolsElectrophoresis Agar Gelchemistry.chemical_classificationTime FactorsIodideIodatesAnalytical chemistrychemistry.chemical_elementIodidesIsotope dilutionIodineMass spectrometrySensitivity and SpecificityMass SpectrometryAnalytical Chemistrychemistry.chemical_compoundIsotopesSpecies SpecificitychemistrySample preparationTriiodideInductively coupled plasma mass spectrometryIodateAnalytical Chemistry
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Non-chromatographic speciation

2010

We evaluate the main strategies for screening trace-element species in most types of sample to establish their strengths and weaknesses, as they offer fast, sensitive and cheaper alternatives to classical methods involving chromatography. We consider the principles of non-chromatographic speciation analysis, based on the different behaviors of chemical species before measurement by atomic and molecular spectrometry and electroanalytical methods, so as to give an update on the literature in this field of research.

Alternative methodsChemical speciesChromatographyChemistryGenetic algorithmElectroanalytical methodAtomic spectroscopyMolecular spectroscopyInductively coupled plasma mass spectrometrySpectroscopyAnalytical ChemistryTrAC Trends in Analytical Chemistry
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Determination of antimony, arsenic, bismuth and copper by inductively coupled plasma atomic emission spectrometry in the electrorefining of copper

1996

Inductively coupled plasma atomic emissionspectrometry (ICP-AES) has been applied as a rapid and routine method for the analysis of process electrolytes in the electrorefining of copper. Antimony, arsenic, bismuth and copper have been selected as major electrolyte constituents. For these elements profound statistical studies of spectral and interelement effects have been carried out. For As, Bi and Sb two analyte wavelengths have been selected, and for Cu one relatively insensitive analyte line has been chosen due to the high Cu concentration in samples. Best analytical lines were: As at 193.759 nm, Bi at 306.772 nm, Sb at 206.833 nm and Cu at 216.953 nm. Multiple linear regression proved t…

AnalyteAntimonyChemistryAnalytical chemistrychemistry.chemical_elementElectrolyteInductively coupled plasmaBiochemistryCopperArsenicAnalytical ChemistryElectrowinningBismuthAnalytical and Bioanalytical Chemistry
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The determination of trace element concentrations in fly ash samples using ultrasound-assisted digestion followed with inductively coupled plasma opt…

2009

Abstract A method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of trace element (chromium, copper, lead, nickel, vanadium and zinc) concentrations in fly ash samples was developed. All the measurements were performed in robust plasma conditions. Ultrasound-assisted digestion procedures using digestion solutions of aqua regia and hydrofluoric acid (HF) resulted in recovery rates of over 80% for all the analyte elements. Ultrasound-assisted two-step digestion with digestion solutions of 6 mL of HNO3 (Step 1) and 3 mL of HNO3 + 3 mL of HF (Step 2) resulted in recovery rates of over 92% for all the ana…

AnalyteChromatographyAcoustics and UltrasonicsOrganic ChemistryAnalytical chemistrychemistry.chemical_elementZincInorganic Chemistrychemistry.chemical_compoundChromiumDigestion (alchemy)chemistryFly ashChemical Engineering (miscellaneous)Environmental ChemistryAqua regiaRadiology Nuclear Medicine and imagingInductively coupled plasmaMicrowave digestionUltrasonics sonochemistry
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