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Topic: Elemental analysis

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Organic chemistry

List of Australians

Greg Chappell

	Elemental Carbon Analysis - Midwest Microlabs Links Page
		of elemental analysis is for carbon, hydrogen, and nitrogen (CHN analysis).
		elemental analyser or in parallel with isotopic analysis of carbon and nitrogen.
		Elemental analysis indicates its molecular formula to be C10H16.
	www.midwestlab.com /links (1209 words)

	Stoichiometry: Elemental Analysis (Site not responding. Last check: 2007-10-29)
		Elemental analysis is an experiment that determines the amount (typically a weight percent) of an element in a compound.
		The elemental analysis of a compound is particularly useful in determining the empirical formula of the compound.
		The elemental analysis permits determination of the empirical formula, and the molecular weight and elemental analysis permit determination of the molecular formula.
	www.chm.davidson.edu /ChemistryApplets/stoichiometry/CH.html (1377 words)

	Elemental analysis Summary
		Elemental analysis is valuable in environmental work to determine the presence of a contaminant or pollutant.
		Elemental analysis is a process where a sample of some material (e.g., soil, waste or drinking water, bodily fluids, minerals, chemical compounds) is analyzed for its elemental composition and sometimes isotopic composition.
		Gravimetry, where the sample is dissolved and then the element of interest is precipitated and its mass measured or the element of interest is volitalized and the mass loss is measured.
	www.bookrags.com /Elemental_analysis (279 words)

	Elemental Analysis, Inc. - Services - Neutron Activation Analysis (NAA)
		These distinct energy-signatures provide positive identification of the targeted element(s) present in the sample, while quantification is achieved by measuring the intensity of the emitted gamma rays that are directly proportionate to the concentration of the respective element(s) in the sample.
		The distinct energy-signatures created are unique to each element and provide positive identification of the targeted element(s) in the sample, while the quantification of the element(s) are determined from the proportion of the intensity to the concentration of the respective element in the sample.
		The position of each energy peak in the spectrograph determines the identification of the element, while the area underlying the peak is proportional to the concentration of the respective element.
	www.elementalanalysis.com /services_naa.asp (2162 words)

	Chemical Solutions: Ultra Trace Level Elemental Analysis ICP-MS Inductively Coupled Plasma-Mass Spectrometry
		Concentrations for the remaining elements are estimated, and the detection levels are usually in the ppm range.
		Elemental analysis: Since 1997, CSL has been performing ultra trace level elemental analysis through the technique of inductively coupled plasma-mass spectrometry (ICP-MS).
		Calcium: A silvery, moderately hard metallic element that constitutes approximately 3 percent of the earth's crust and is a basic component of most animals and plants.
	www.chemicalsolutionsltd.com (912 words)

	C/H/N Elemental Analysis (Site not responding. Last check: 2007-10-29)
		Elemental analysis on carbon, hydrogen and nitrogen is the most essential - and in many cases the only - investigation performed to characterize and/or prove the elemental composition of an organic sample.
		Numerous compounds include no additional elements besides C, H and N except oxygen, which is seldom determined seperately (although it can be done!).
		Elemental analysis of phosphorus contaning compunds can thus suffer from systematic deviations in the determined carbon content exceeding the tolerance limit of 0,3 w-%.
	www.univie.ac.at /Mikrolabor/chn_eng.htm (701 words)

	Laser Analysis Technologies - Technology
		The elemental fluorescence is directly related to the concentration of the element in the material being analysed.
		Analysis times have been reduced to approximately 20 seconds for simultaneous determination of the concentration levels of all the detectable elements, which compares favorably to alternative elemental analysis technologies.
		Laser Analysis Technologies is proving laser induced breakdown spectroscopy has a major role to play in modern elemental analysis and we are continuing to break new ground in new applications every day.
	www.laseranalysis.com /pages/technology.php (348 words)

	Elemental Analysis
		So, for our oil analysis freshmen, POA will be running a series of articles throughout 2002 on all of these fundamental oil analysis tools to explain how they work, what they are designed to tell you and what all those numbers that come back from the lab actually mean.
		In its present form, elemental analysis is used to determine the concentrations of 15 to 25 different elements ranging from wear metals and contaminants to oil additives.
		When analyzing elemental analysis data, it is important to look not at the absolute value of each element, but rather the trend line, that is, the change in elemental concentrations over consecutive samples.
	www.practicingoilanalysis.com /article_detail.asp?articleid=287&relatedbookgroup=OilAnalysis (1533 words)

	Standards and Guidlines - Forensic Science Communications - January 2005
		Element concentrations may be used to differentiate among glasses made by different manufacturers, glasses from different production lines of a single manufacturer, specific production runs of glass from a single manufacturer, and in some instances individual glass objects produced at the same production facility.
		The energies or wavelengths of the detected X-rays are used to identify the elements, and the intensities of the X-ray peaks in the measured spectrum correlate with the quantities of each element present in the sample area exposed to the X-ray beam.
		Elemental analysis methods are used when other methods of comparison fail to distinguish two glass fragments as having different sources.
	www.fbi.gov /hq/lab/fsc/backissu/jan2005/standards/2005standards10.htm (6747 words)

	Former Brand Names Thermo Scientific
		Click the link in the right column and you will be directed to the area of business most closely related to that name.
		Centrifugation; Density, Flow and Level Measurement;Fluid Handling; Heating Instruments; Material Characterization and Testing; Sample Preparation; Water Analysis Instruments
		Chillers, Circulators, Water Baths; Chromotography; Cold Storage Equipment; Heating Instruments; Histology; Incubators and Environmental Chambers; Laboratory Consumables and Pipetting; Molecular Spectroscopy; Sample Preparaion; Water Purification
	www.thermo.com /com/cda/article/general/0,2259,34,00.html (200 words)

	GDX Elemental Analysis Assessment
		With the enormous amounts of toxic metal in the environment and widespread nutrient mineral insufficiencies, assessing patients for element imbalances and excesses is increasingly important.
		Element Analysis (hair) reports come with a special index that displays the likelihood of external contamination for each element, placing results into proper clinical perspective.
		Using these element assessments, the clinician can quickly pinpoint and treat toxic and nutrient imbalances that may be triggering chronic fatigue, depression, hyperactivity (children), "foggy" brain, stress, thyroid problems and many other health conditions.
	www.gdx.net /ns/assessments/elemental (177 words)

	Elemental Analysis - elem
		The user specifies in the input file--in addition to the experimental analysis results--the atomic or molecular blocks that should be varied by the program, and the ranges and steps of variation.
		It should only use elements that are defined in the elem.txt file, and it should not use parentheses as they are not recognized.
		The first line gives the values of the variables for that composition; the second gives the elemental composition; the third gives the total squared absolute error, which is the criterion used to sort the results; and the last one gives the relative error by element.
	zarbi.chem.yale.edu /~ivan/elem (951 words)

	Elemental Analysis for Vitaletheine Modulators
		Indications in the Sulfenate-Linked Benzyl Derivative's (SLBCD) mass spectra of tenacious coordination with water is supported by the proton NMR spectra and elemental analysis of authentic samples of its calcium oxide complex.
		In the early elemental analysis of authentic compound, a quarter of a mole of residual water per mole of the benzyl derivative complex (essentially, a partially hydrated sulfenate-linked dimer) produces a calculated elemental analysis that agrees very closely with the experimental values observed by Ruby Ju in the Department of Chemistry at UNM.
		The elemental analysis for the zinc salt of vitaletheine V4 reported in the patents supports this contention.
	www.vitaletherapeutics.org /vtlmntla.htm (544 words)

	Tricks to Classifying Wear Metals and Other Used Oil Suspensions
		There have been many reported cases where this limitation led to “missed saves” when elemental analysis was not flanked by other large particle techniques such as particle counting, ferrous density analysis and patch testing.
		After correction for the dilution by the kerosene, this elemental value represents the soluble metals (D) and the difference between this value and the baseline (A) is the apparent particulate metal concentration.
		Elemental analysis from routine used oil testing shows only slight rise in lead and tin but a sharp jump in particle count.
	www.practicingoilanalysis.com /article_detail.asp?articleid=3&relatedbookgroup=WearDebris (2702 words)

	Oil analysis and lubrication learning cennter
		In elemental analysis, samples (oil, grease, sludge, polymer, etc.) must first be exposed to an excitation source.
		Because numerous elements have multiple radioisotopes of varying half-lives, there is significant flexibility in what isotope is used to determine an elemental concentration.
		Elements that have a half-life of less than a few hours can normally be detected in a single count but the count must be performed at the reactor facility.
	www.noria.com /learning_center/category_article.asp?articleid=542&relatedbookgroup=OilAnalysis (1321 words)

	Elemental Analysis with Oxygen Combustion
		The elements are converted to their anions or oxy-anions such as chloride, sulfate, or phosphate.
		Recovery of the elements at trace levels from standards is normally 90-110%.
		Use of the oxygen bomb to prepare the sample prior to analysis by ICPMS proved to be successful, with matrix spike recoveries of 70 - 130%.
	www.wcas.com /TECH/elemental_analysis.htm (380 words)

	AdZe's Classroom - Elemental Analysis
		The ancients conceived of four elements that made up the universe: fire, earth, air and water.
		These elements became the basic building blocks of science, philosophy and astrology.
		All things aquatic and nautical fascinate you; you are in your natural element when surrounded by water.
	www.adze.com /astro/elements.html (1028 words)

	Elemental Analysis of Tree Rings
		Also, for most analysis techniques, the acid digests are brought up to a larger volume, further diluting the metals concentration.
		Graphite furnace techniques are probably the best for any given single element, but its chief disadvantages are the time necessary to set up and calibrate the tube, single element analysis only, and the short life of the graphite tubes.
		In my experience with trace metals analysis of wood, the biggest difference in temporal patterns is between ring-porous and diffuse-porous species with the ring-porous species showing patterns of historical significance.
	homer.ornl.gov /baes/documents/treerings (2021 words)

	Millipore - Technical Library - Ultrapure Water for Elemental Analysis down to ppt levels
		Depending on the elements studied and the environmental conditions of the analytical laboratory, various instrument configurations are possible.
		Blank levels of a given element are affected by such factors as the purity of sample-treating solutions, container purity and the general analytical environment.
		Studies concerning ultratrace analysis show that blank optimization is only achievable when ultrapure water with sub-ppt level contamination for most of the elements is used.
	www.millipore.com /publications.nsf/docs/rd002 (3592 words)

	Costech - ECS 4010 CHNSO Analyzer - Innovation in Elemental Analysis
		It represents an evolution in the technique of elemental analysis by "flash combustion/chromatographic separation and multi-detector techniques".
		For the analysis of stable isotopes of CHNSO, a sampling system is required which does not contaminate the sample with atmospheric nitrogen and oxygen, especially working at very low levels.
		To increase throughput and minimize maintenance time and cost, a simple approach to the design of the analyzer is essential, especially for macro sample analysis where all combustion gases pass through the detector system without splitting or diluting.
	www.costechanalytical.com /products/ecs4010.aspx (201 words)

	Archaeological Science: The Anthropology Department at The Field Museum
		The Elemental Analysis Facility was built with funds from the National Science Foundation, an anonymous donation, and the Anthropology Alliance.
		Analysis of metal technologies and comparisons of bronze alloying is an example anthropological application for this instrument.
		Anthropological applications of the MC-ICP-MS include lead isotope ratios to source ores found in smelted metals (trace element analysis cannot do this since the element percentages are changed by the smelting process; but the lead isotope ratios remain the same as their parent ore).
	www.fieldmuseum.org /research_collections/anthropology/research_archsci.htm (765 words)

	Elemental Analysis In The Pharmaceutical, Food and Cosmetics Industries Using X-Ray Techniques - Sup (Site not responding. Last check: 2007-10-29)
		Monitoring the concentration of these elements can also be used as way to control the efficiency of the refining and production process.
		Designed for accuracy, precision and sub-ppm detection limits the Epsilon 5 excels in medium-heavy metals analysis, targeting a wide range of elements of health and environmental significance.
		Other advantages of XRF are also simplicity of use, short analysis time and simultaneous analysis leading to a high throughput.
	www.azom.com /details.asp?ArticleID=2790 (871 words)

	WMRC - Laboratory Services - Metals Group - Elemental Analysis
		We have two ICPMS instruments available for elemental analysis: a Thermo Elemental PQ ExCell ICPMS and a Perkin Elmer ELAN 5000 ICPMS.
		Both units can perform both quantitative and semi-quantitative analyses of most elements in the Periodic Table from percent levels to sub parts-per-billion levels.
		Elements from lithium to uranium can be measured on these units.
	www.wmrc.uiuc.edu /main_sections/lab_services/elemental_analysis.cfm (174 words)

	The Scientist : New Spectrometers: A Panacea For Elemental Analysis? (Site not responding. Last check: 2007-10-29)
		An argon plasma is used as an ion source, while the spectrometer serves as a mass-selective (and hence element-and isotope-selective) detector.
		This plasma is extremely hot (5,000 K to 8,000 K) and chemically inert, leading to near uniform ionization of most elements and a relatively “clean” background spectrum.
		Two interesting examples are its use as a multi-elemental chromatography detector, which will probably find great value in the determination of trace element speciation in environmental or biological samples, and its growing use in monitoring stable isotope tracers as employed in nutritional and medical research.
	www.the-scientist.com /article/display/8960 (541 words)

	Trace Elemental Analysis (Site not responding. Last check: 2007-10-29)
		Intertek laboratories provide element trace analysis detection ranges in the parts per million (ppm), parts per billion (ppb) and parts per trillion (ppt) levels.
		Elemental trace analysis techniques are availabe for a wide range of samples and sample-matrices.
		Learn more about trace-element analysis capabilities and applications through the global Intertek laboratory network.
	www.intertek-cb.com /newsitetest/news/elementalanalysis.shtml (65 words)

	Elemental Identification
		Much of the time, the energy is the result of changes in the speed of an electron, which is random; however, when this interaction removes an electron from a specimen's atom, frequently an electron from an outer shell (or orbital) occupies the vacancy.
		Two methods are used to determine the x-rays that are produced: (1) energy-dispersive analysis separates and detects x-rays of specific energy and displays them as histograms, whereas (2) wavelength-dispersive analysis uses the reflection of x-rays off of a crystal at a characteristic angle to detect x-rays of specific wavelength.
		WDS analysis is available at the Electron Microprobe Facility in the Energy Center.
	www.ou.edu /research/electron/element.html (506 words)

	Evans Analytical Group LLC (Site not responding. Last check: 2007-10-29)
		The chemical states of elements in the sample also influence the process of elemental analysis by AES.
		In spite of the above considerations, quantification of elemental concentrations is possible in cases where relative sensitivity factors have been measured in the same sample matrix.
		(In contrast, SIMS usually provides trace element quantification while the major elements remain essentially constant.) Since concentrations of all elements, (including the matrix) can vary in an AES measurement, it is necessary to express concentrations as percents (CE%) normalized relative to the sum of all others.
	www.eaglabs.com /en-US/references/tutorial/augtheo/quant.html (370 words)

	Molecular Weight & Elemental Analysis Calculator (E)
		Calculating formula weight and percent of elements must be the most elemental part in chemical education.
		First, input the chemical formula which is constructed by the elemental symbols and numbers at the text field on the top of the window.
		You can use white space to separate the elemental symbols and can use brakets () to express some functional groups, where " or ' are required by means of the unix shell argument.
	www.st.hirosaki-u.ac.jp /~rmiya/xmolwt/xmolwt-e.html (635 words)

	Elemental Analysis Lab: FAQ'S
		I am certain that my sample has the correct molecular structure, but the CHN results do not agree with the predicted weight percentages.
		It is essential that you provide your name, phone number, e-mail address, your advisor’s name, and a valid shortcode account number for billing purposes.
		In cases where you have very little sample available, it is possible to do one CHN run with as little as 1 mg.
	www.umich.edu /~techserv/chnlab/faq.htm (699 words)

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