spectrometry Articles
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A simple and fast micromethod for the analysis of polychlorinated biphenyls in air by sorbent enrichment and ultrasound-assisted solvent extraction
Abstract A combination of sorbent enrichment and ultrasound-assisted solvent extraction has been used to determine polychlorinated biphenyls in air. Analytes were sampled by pumping a known volume of air through a porous polymer (Tenax TA). The enriched adsorbent was transferred into a glass vial, and ultrasound-assisted extraction of the analytes was then performed in n-hexane. ...
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Metals and organic pollutants in snow surrounding an iron factory
Abstract To estimate air pollution snow samples were collected in March 2001 at six sites in the vicinity of the Kostomuksha factory in Karelia. Seventy-two chemical elements and more than 200 individual organic compounds were identified by inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography mass spectrometry (GC-MS). It was found that the levels of Li, B, Al, Fe, Ni, Cu, ...
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Techniques for Chromatography Testing and Mass Spectrometry
Chromatography testing and mass spectrometry are two analytical techniques widely used in scientific research, pharmaceuticals, food safety, environmental analysis, and forensic investigations. These techniques play a crucial role in identifying and quantifying chemical compounds, determining the purity of substances, and understanding molecular structures. In this article, we will explore the ...
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What is SIMS Surface Analysis?
SIMS is a high-sensitivity surface analysis technique for determining surface composition, contaminant analysis and depth profiling in the uppermost surface layers of a sample. Secondary ion mass spectrometry, or SIMS, is one of the most sensitive techniques for interrogating the uppermost surface layers of material, from depths of a single atomic layer to several tens of microns (µm). It ...
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Fe3O4-CS-L: a magnetic core-shell nano adsorbent for highly efficient methyl orange adsorption
A novel core-shell bio-adsorbent was fabricated by using biological materials for removing methyl orange (MO) from aqueous solution. The structure characteristics results of scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), thermo-gravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Brunauer–Emmett–Teller (BET) shows that Fe3O4-CS-L has been ...
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Model-Measurement Consistency and Limits of Bioaerosol Abundance Over the Continental United States
Abstract. Due to low concentrations and chemical complexity, in-situ observations of bioaerosol are geographically and temporally sparse, and this limits the accuracy of current emissions inventories. In this study, we apply a new methodology, including corrections for misidentification of mineral dust, to measurements of single particles over four airborne sampling campaigns to derive vertical ...
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An Inert Desolvating Nebulizer System for Reduction of Matrix‐Induced Oxide Interferences on Rare Earth Elements, Iridium, and Platinum Using Quadrupole Inductively Coupled Plasma Mass Spectrometry
ABSTRACT This application note will examine the use of an inert low-flow desolvating nebulizer system for reduction of oxide mass spectral interferences that can occur in quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS). This nebulizer system uses an inert, low-flow nebulizer (100 microliters/min) coupled to an inert, heated membrane desolvator for efficient water vapor removal ...
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An Inert Desolvating Nebulizer System for Reduction of Matrix‐Induced Oxide Interferences on Rare Earth Elements, Iridium, and Platinum Using Quadrupole Inductively Coupled Plasma Mass Spectrometry
ABSTRACT This application note will examine the use of an inert low-flow desolvating nebulizer system for reduction of oxide mass spectral interferences that can occur in quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS). This nebulizer system uses an inert, low-flow nebulizer (100 microliters/min) coupled to an inert, heated membrane desolvator for efficient water vapor removal ...
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Extended performance analysis of polyurethane–iron oxide nanocomposite for efficient removal of arsenic species from water
A polyurethane (PU) foam nanocomposite impregnated with iron oxide nanoparticles (IONPs) was developed to remove arsenic (As) from drinking water at ppb concentrations. The effect of synthesis and application parameters such as the size of IONPs, pH levels, weight of adsorbents, and arsenic concentrations on the performance of PU-IONP adsorbents in removing arsenic were studied. The prepared ...
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Why Use SIMS Imaging for Depth Profiling?
Secondary ion mass spectrometry (SIMS) is advantageous for its high sensitivity and the ability to provide high spatial resolution elemental and molecular information as a function of depth. This makes SIMS imaging an essential tool for depth profiling, where samples’ chemical/molecular information is investigated layer by layer. It is compatible with a wide range of different species, ...
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The radiological impact on some workers due to the natural radionuclides from some industries
A total of 37 different soil samples and 22 air samples were collected from natural industrial sources. The air samples were collected at a height of 1 m above the ground on 10.4 cm diameter filter paper (with a desired collection efficiency) using a high-volume air sampler. The activity concentration levels of naturally occurring radionuclides such as the U-238 series and Th-232 series were ...
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Particulate matter and particle-bound polycyclic aromatic hydrocarbons in the Dapu road tunnel in Shanghai
Airborne Particulate Matter (PM) was collected in a cross-river road tunnel using portable air samplers and a cascade impactor. Sixteen EPA priority Polycyclic Aromatic Hydrocarbons (PAH) in the PM were quantified by gas chromatography/mass spectrometry. Profiles and diagnostic ratios of PAHs were investigated, and size distribution of PM mass and PAHs were discussed. High concentrations of PM2.5 ...
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Using Mass Spectrometry to Monitor Reactor Solvent Composition During Solvent Swaps
ABSTRACT In the Pharmaceutical Industry it is a common practice to carry out reactions in various solvents that are chosen to aid in the reaction or separation process. There are many instances where solvents must be swapped between stages. In other instances water may be present from the reaction or from an extraction that has to be removed. These solvents are usually removed by one or more ...
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Detailed characterisation of essential oils by flow-modulated GC×GC and Tandem Ionisation mass spectrometry
Volatile oils of plants, also known as essential oils, have been used for many years for their flavour, fragrance and medicinal properties. However, their extreme complexity and diversity presents analysts with a significant challenge when it comes to quality control. They are generally composed of monoterpenes and sesquiterpenes, as well as their oxygenated derivatives, such as aliphatic ...
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Ukas accredited laboratory manages its own configurations of Matrix Gemini LIMS case study
By working closely with Autoscribe on the upgrade of Matrix 4 to Matrix Gemini, staff at Cavendish Nuclear's environmental laboratory have become so proficient in using Gemini's one-time configuration tools that they manage and implement any updates and developments to their own system as their needs arise. Background Cavendish Nuclear's environmental laboratory is an internationally recognised ...
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Teledyne Scientific Instruments - Direct Sampling MS and MS/MS for Real Time Air Monitoring
Presented at the 44th ASMS Conference on Mass Spectrometry, May 12-16, 1996 Portland, OR. Published in the Proceedings of the 44th ASMS Conference on Mass Spectrometry May 12-16, 1996 Portland, OR, in press. DIRECT SAMPLING MS AND MS/MS FOR REAL TIME AIR MONITORING C. Remigi, P.T. Palmer, Dept. of Chemistry & Biochemistry, SF State University, SF, CA D. Karr, Teledyne Scientific ...
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Calibration and Spectrum Troubleshooting: IMS Spectrum Introduction, Measurement and Calibration (Series Part 1 of 4)
Introduction The AirSentry II AMC Analyzer detects airborne molecular contamination (AMCs) in cleanroom manufacturing environments. AMCs cause defect loss and product degradation and its reduction is critical for manufacturers to stay competitive. AMC measurement techniques must allow for accurate, reliable event detection in real-time. The AirSentry II analyzer uses Ion Mobility Spectrometry ...
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Arsenic geochemistry in a biostimulated aquifer: An aqueous speciation study
Stimulating microbial growth through the use of acetate injection wells at the former uranium mill site in Rifle, Colorado, USA, has been shown to decrease dissolved uranium (VI) concentrations through bacterial reduction to immobile uranium (IV). Bioreduction also changed the redox chemistry of site groundwater, altering the mobility of several other redox‐sensitive elements present in the ...
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Using SIMS to Determine Isotopic Compositions
Isotopic composition refers to how many different isotopes of an element are present and presented by highlighting the abundance of each isotope in atom percentage (%). This percentage indicates how many atoms in a sample are a specific isotope from all possible atoms in one element. Understanding isotopic composition is essential for many applications across the science and engineering ...
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Application of an Enzyme-Linked Immunosorbent Assay for the Analysis of Paraquat in Human-Exposure Samples
Paraquat is a toxic quaternary ammonium compound used as an herbicide around the world. Easy, fast, and inexpensive but sensitive methods are needed to study the effects of long-term, low-level exposure of paraquat on human health. An enzyme-linked immunosorbent assay (ELISA) was used for quantification of paraquat in urine and air-filter samples collected in a human-exposure study among farm ...
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