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Topic: Spectrophotometry


In the News (Thu 24 Apr 14)

  
  Tube cell for atomic absorption spectrophotometry - Patent 4708478
This invention relates to a tube cell for flameless atomic absorption spectrophotometry comprising a tubular body of electrically conductive material with the tubular body being arranged for mounting in a spectrophotometer such that its longitudinal axis is substantially horizontal.
In the flameless atomic absorption spectrophotometry process the graphite tube is heated to a high temperature by the passage of electric current so that the sample substance is first dried and sometimes ashed before reaching a temperature at which it is atomized, i.e.
First it serves as a carrier for the samples to be analysed; secondly the heating of the graphite tube causes the sample carrier to be evaporated and the sample then to be atomized and finally the tube serves to hold together the atomic cloud thus produced.
www.freepatentsonline.com /4708478.html   (4869 words)

  
 Brainboost - uv spectrophotometry
A rapid method based on UV spectrophotometry is described for simultaneous determination of salicylates and barbiturates in serum..
The chief purpose of the UV spectrophotometry is to determine temperatures for each of the stars in these systems..
UV spectrophotometry is particularly useful in detecting and quantifying colourless substances in solution..
www.brainboost.com /search.asp?Q=uv+spectrophotometry&lfmq=1   (94 words)

  
  Spectrophotometry - Wikipedia, the free encyclopedia
In physics, spectrophotometry is the quantitative study of electromagnetic spectra.
It is more specific than the general term electromagnetic spectroscopy in that spectrophotometry deals with visible light, near-ultraviolet, and near-infrared.
Visible region 400-700nm spectrophotometry is used extensively in colorimetry science.
en.wikipedia.org /wiki/Spectrophotometry   (721 words)

  
 EPA - Air - OAQPS - APTI - Air Pollution Control - Spectrophotometry   (Site not responding. Last check: 2007-10-14)
Spectrophotometry is one of the most useful and widely used tools available for quantitative analysis.
Spectrophotometry relies on colorimetric principles and is commonly used to measure sulfur dioxide (SO2) concentrations.
As ultraviolet light at 253.7 nm is passed through the optic bench, a fixed quantity of "zero air" and ambient air are drawn into the bench.
www.epa.gov /air/oaqps/eog/course422/ce4b1.html   (245 words)

  
 Spectrophotometry of 237 stars in 7 open clusters
The final calibrated spectral energy distributions (SEDs; relative to 5556{AA}) for all 237 stars are given in Table 4 according to the cluster identification number, the star HD or BD number, and the night(s) of observation.
Spectrophotometry is presented for 237 stars in 7 nearby open clusters: Hyades, Pleiades, Alpha Persei, Praesepe, Coma Berenices, IC 4665, and M39.
As such, the residuals from both the filter color fits and the Kurucz model fits are tabulated for each star where it was possible to make a comparison, so users of these data can choose stars according to the accuracy of the data that is appropriate to their needs.
www.cs.wisc.edu /niagara/data/nasa/AJ_114_699.xml   (1997 words)

  
 JCE 1998 (75) 978 [Aug] Spectrophotometry (by Barbara Sawrey and Gabriele Wienhausen)
Spectrophotometry is an interactive CD-ROM which introduces the basics of UV-visible spectrophotometry with some mention of infrared and other forms of spectrophotometry.
The final section on Quantitative Spectrophotometry, subtitled "The abc's of Beer's Law", explains the derivation and use of Beer's law.
On balance, Spectrophotometry is a very useful tool for introducing the subject to students or others who need an understanding of the interaction of matter and light, Beer's law, and the components and operation of a single-beam spectrophotometer.
jchemed.chem.wisc.edu /Journal/Issues/1998/Aug/abs978.html   (1879 words)

  
 Chapter 2 - Spectrophotometry
Spectrophotometry is an important technique used widely in biology and chemistry.
spectrophotometry - the process of measuring light intensities with a spectrophotometer.
Calculate the concentration of AB, A, and B when the absorbance of a 10 mL solution is 0.604 in a 1-cm cuvette with light of 370 nm.
www.msu.edu /~bchug/bch471/471cpch2.htm   (881 words)

  
 UNODC - Bulletin on Narcotics - 1985 Issue 1 - 007
Ultraviolet spectrophotometry may be used to determine the quantity of amphetamines, provided that there are no other compounds in the sample that would interfere on the absorption band used for quantitation.
Fluorescence spectrometry may be much more sensitive than ultraviolet spectrophotometry, and the characterization of a compound by spectra for excitation and for emission may give high specificity [ 11], although strongly fluorescent impurities may interfere.
Optical isomers of amphetamines may be distinguished by infra-red spectrophotometry as isomeric mandelate derivatives [ 1] [ 15].
www.unodc.org /unodc/pt/bulletin/bulletin_1985-01-01_1_page008.html   (6205 words)

  
 Spectrophotometry of cerebrospinal fluid in suspected subarachnoid haemorrhage -- Cruickshank et al. 330 (7483): 138 -- ...   (Site not responding. Last check: 2007-10-14)
Spectrophotometry of cerebrospinal fluid in suspected subarachnoid haemorrhage -- Cruickshank et al.
Spectrophotometry of cerebrospinal fluid in suspected subarachnoid haemorrhage
Spectrophotometry should be used to confirm the absence of haem
bmj.bmjjournals.com /cgi/content/full/330/7483/138   (576 words)

  
 Spectrophotometry - Definition, explanation
In physics, spectrophotometry is the quantitative study of spectra.
It is more specific than the general term electromagnetic spectroscopy in that spectrophotometry deals with visible light, near-ultraviolet, and near-infrared.
Visible region 400-700nm spectrophotometry is used extensively in colorimetry science.
www.calsky.com /lexikon/en/txt/s/sp/spectrophotometry.php   (760 words)

  
 Algorithms: Spectrophotometry - SDSS DR4
Because the SDSS spectra are obtained through 3-arcsecond fibers during non-photometric observing conditions, special techniques must be employed to spectrophotometrically calibrate the data.
There have been three substantial improvements to the algorithms which photometrically calibrate the spectra (1) improved matching of observed standard stars to models; (2) tying the spectrophotometry directly to the r-band fiber magnitudes measured by the most recent version of the photometric pipeline; and (3) no longer using the "smear" exposures.
Users of spectra should note, though, that the fractional improvement in spectrophotometry is much greater than the extinction correction itself.
www.sdss.org /dr4/algorithms/spectrophotometry.html   (728 words)

  
 SpectroPhotometry - Main - Space Telescope Science Institute
The tie to the NVO is use of URLs and VOTables.
Spectra of a class of sources is discovered with the VO and spectrophotometry is obtain using the web service.
The data references and band pass descriptions are passed to a web service that does spectrophotometry on the specified data with the specified band passes.
chart.stsci.edu /twiki/bin/view/Main/SpectroPhotometry   (584 words)

  
 Standards and Guidlines - Forensic Science Communications - January 2005
An inductively coupled plasma-optical emission spectrophotometry analytical method was developed to determine the concentrations of Mn, Fe, Mg, Al, and Ba in glass fragments (Catterick and Hickman 1981).
Inductively coupled plasma-optical emission spectrophotometry has also been used to associate food containers to the manufacturing plants in which they were made and to identify sources of contaminant glass in cases involving product tampering (Wolnik et al.
Analytical characteristics of inductively coupled plasma-optical emission spectrophotometry instruments include the capability to determine a wide range of elements, long linear response ranges, a limited number of spectral and matrix interferences, low detection limits for many elements of interest, and ease of automation of data handling.
www.fbi.gov /hq/lab/fsc/backissu/jan2005/standards/2005standards10.htm   (6747 words)

  
 HPLC Solvents offered by GFS Chemicals
Quality is controlled not only by UV Spectrophotometry, but also by capillary gas chromatography with electron capture and flame ionization detectors.
Suitable for pesticide analysis, gas chromatography, liquid chromatography and ultraviolet spectrophotometry.
Suitable for pesticide analysis, gas chromatography and ultraviolet spectrophotometry.
www.gfschemicals.com /productcatalog/HPLC_Solvents.asp   (381 words)

  
 Directory of open access journals
Atomic absorption spectrophotometry (AAS) has been used in this study to find out if there is any change occurring in the serum zinc levels under diseased conditions.
MATERIALS AND METHODS: This study was conducted on 80 patients with symptoms of prostatic diseaseof prostatic disease (normal baseline group comprised of 20 men, who had normal prostate on initial workup).Blood samples of all 80 cases and prostate tissue of 60 patients with enlarged prostate were taken for analysis.
Serum sample was subjected to Atomic Absorption Spectrophotometry (AAS) for analysis of serum zinc levels.
www.doaj.org /doaj?func=abstract&id=105037&recNo=5&toc=1   (362 words)

  
 ACP Best Practice No 166: CSF spectrophotometry in the diagnosis of subarachnoid haemorrhage -- Cruickshank 54 (11): ...
CSF spectrophotometry in the diagnosis of subarachnoid haemorrhage
peak with a bilirubin shoulder on spectrophotometry (fig 4
Figure 5 Flow diagram of the procedure to diagnose subarachnoid haemorrhage (SAH) using spectrophotometry of cerebrospinal fluid (CSF).
jcp.bmjjournals.com /cgi/content/full/54/11/827   (1743 words)

  
 S1312 Spectrophotometry and Spectrofluorimetry A Practical Approach 2nd ed. null   (Site not responding. Last check: 2007-10-14)
S1312 Spectrophotometry and Spectrofluorimetry A Practical Approach 2nd ed.
Spectrophotometry and Spectrofluorimetry: A Practical Approach, 2nd ed.
Spectrophotometry and fluorimetry of cellular compartments and intracellular processes,
www.sigmaaldrich.com /ProductLookup.html?ProdNo=S1312&Brand=SIGMA   (215 words)

  
 BioForum > DNA quantification
Spectrophotometry is usually good, as long as your technique is also good, ie good pipetting if you are using a dilution (I normally use 1/50) to measure concentration, clean tubes for blanking, etc. However the spec will give you total nucleotide concentration, which might be prone to error in some cases, eg.
I just wonder how sensitive spectrophotometry is. In the lower range of OD reading such as 0.001, the resulted concentration may not accurate.
Oct 8 2004, 06:38 AM Hi You can also scan your gel, and then using the software that goes with the scanner count the pixels in your band and in one of the marker's.
www.protocol-online.org /forums/lofiversion/index.php?t3675.html   (616 words)

  
 Atomic absorption spectrophotometry (AAS)   (Site not responding. Last check: 2007-10-14)
Atomic absorption spectrophotometry (AAS) is an analytical technique used to measure a wide range of elements in materials such as metals, pottery and glass.
Although it is a destructive technique (unlike ED-XRF), the sample size needed is very small (typically about 10 milligrams - i.e.
However, it is very sensitive and it can measure trace elements down to the part per million level, as well as being able to measure elements present in minor and major amounts.
www.british-museum.ac.uk /science/text/techniques/sr-tech-aas-t.html   (217 words)

  
 DIVA: Stw U. Bonn, Spectrophotometry
Spectrophotometry will be obtained for about 10 million stars, including UV-photometry in two channels adjacent to the Balmer jump.
The spectrophotometry will be used to derive surface temperatures, surface gravities and metallicities of the stars as well as the extinction toward the star.
                      The   spectrophotometry project   coordinated at the   Sternwarte Bonn.
www.astro.uni-bonn.de /~willemse/divabn-spec.html   (405 words)

  
 Clinical Application of Tissue Reflectance Spectrophotometry to Periodontal Disease -- Shizukuishi et al. 2 (2): 389 -- ...
Clinical Application of Tissue Reflectance Spectrophotometry to Periodontal Disease -- Shizukuishi et al.
Articles by Shizukuishi, S. Articles by Tsunemitsu, A. Clinical Application of Tissue Reflectance Spectrophotometry to Periodontal Disease
Sato, Osaka University Medical School, Osaka, Japan, for his helpful advice on the tissue reflectance spectrophotometry measurements.
adr.iadrjournals.org /cgi/content/abstract/2/2/389   (223 words)

  
 TWiki . Main . SpectroPhotometry
The Spectrophotometry Web Service takes VO accessible spectra and computes broadband fluxes, custom filter fluxes, line indices, and equivalent widths.
Spectra of a class of sources is discovered with the VO and spectrophotometry is obtain using the web service.
The data references and band pass descriptions are passed to a web service that does spectrophotometry on the specified data with the specified band passes.
www.us-vo.org /summer-school/2005/proceedings/student_projects/spectrophotometry.htm   (577 words)

  
 NIST - Spectrophotometry Short Course
This week-long short course in spectrophotometry will introduce the students to the fundamental concepts of optical properties measurements through a set of lectures and closely-related laboratory exercises.
Upon completion of the course, the student should have a good understanding of the theory and practice of spectrophotometry using dispersive and Fourier-transform techniques, as well as optical scatterometry.
After that date the rooms will be released for general sale at the prevailing rates of the hotel.
physics.nist.gov /Divisions/Div844/spsc.html   (1140 words)

  
 - ISBN 0199638136 - Spectrophotometry and Spectrofluorimentry: A Practical Approach
Select a shipping type and your state to calculate your shipping costs and sales tax.
This book helps readers better understand the background concepts and practical application of spectrophotometry and spectrofluorimetry.
substantially updated chapters addressing the principles of most of the more common applications, such as: spectrophotometry, spectrophotometric assays, spectrofluorimetry, time resolved fluorescence and phosphorescence studies, circular dichroism, and pre-equilibrium spectroscopic techniques.
www.campusbooks.com /books/0199638136   (438 words)

  
 xu   (Site not responding. Last check: 2007-10-14)
The new technology has the potential to increase the sensitivity of most commonly used optical analytical instruments 100 to 1000 fold over that of state-of-the-art commercial instruments.
Our current research is focused on the implementation of the new technology to a wide range of instrumentations including UV-Vis Spectrophotometry, Infrared (IR) Spectrophotometry, High Performance Liquid Chromatography (HPLC), Atomic Absorption (AA), Inductively Coupled Plasma Atomic Emission (ICP-AE), and Circular Dichroism (CD).
This research could dramatically improve both qualitative and quantitative analytical capability in a broad range of chemical, biological, medical and other applications.
www.umsl.edu /%7echem/faculty/xu.htm   (804 words)

  
 QuĂ­mica Nova - Employment of a single standard solution for analytical curves in flow injection analysis system ...   (Site not responding. Last check: 2007-10-14)
A flow cell contends the chromogenic reagent 1-(2-tiazolylazo)-2-naphtol was positioned on the optical path.
The procedures were successfully applied for zinc determination in synthetic solutions with good precision and accuracy at 95% confidence level.
Keywords: flow injection analysis; solid phase spectrophotometry; analytical curves.
www.scielo.br /scielo.php?script=sci_arttext&pid=S0100-40422003000400004   (2938 words)

  
 Preliminary Examination of Machine Copier Toners by Infrared Spectrophotometry and Pyrolysis Gas Chromatography
Thirty-five photocopy toners and copies processed from machines using the respective toners were collected from five manufacturers.
Through infrared spectrophotometry, a spectral match between the standard toner powder and the toner extracted from the respective copied document was achieved.
Also toners were categorized into 18 different groups, of which 7 included more than 1 toner.
www.astm.org /DIGITAL_LIBRARY/JOURNALS/FORENSIC/PAGES/816.htm   (211 words)

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