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Mass spectrometry Tag

Dayton DUI Attorney Charles Rowland > Posts tagged "Mass spectrometry"

DUI Science: Gas Chromatography

Gas chromatography mass spectrometry (hereinafter GCMS) is the most reliable method for alcohol testing in blood and urine and has become the accepted gold standard in forensic toxicology.  Gas chromatography specificity for ethanol (drinking alcohol) is very good and this method can also identify and quantify other organic or interfering substances such as methanol and isopropanol. The two commonly used techniques for analyzing the gases are “direct injection” and “headspace analysis.”  The devise works by utilizing a flow-through tube known as the column.  The different chemicals in the sample pass via a gas stream at different rates depending on their interaction with the column’s...

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Gas Chromatography Mass Spectrometry (An Overview)

To fully comprehend the processes of chemical testing, your DUI attorney should understand gas chromatography - mass spectrometry. Gas chromatography mass spectrometry (hereinafter GCMS)  is a method that combines the features of gas-liquid chromatography and mass spectrometry to identify different substances within a test sample.  GC-MS has been widely heralded as a "gold standard" for forensic substance identification because it is used to perform a specific test.Ohio Administrative Code 3701-53-03(A) sets forth the techniques and methods for determining the concentration of alcohol in blood, urine and other bodily substances.  Pursuant to that rule, Ohio allows for testing including gas chromatography and enzyme assays.  The GCMS instrument is...

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Blood & Urine Testing in Ohio; O.A.C. 3701-53-03

Image via WikipediaOhio Administrative Code 3701-53-03 regulates the testing of blood, urine and other bodily substances for purposes of evidential testing.  Section (A) is specific to alcohol and approves gas chromatography and enzyme assays as approved testing techniques.  "The technique or method must have documented sensitivity, specificity, accuracy, precision and linearity. The technique or method can be based on procedures which have been published in a peer reviewed or juried scientific journal or thoroughly documented by the laboratory.O.A.C. 3701-53-03(B) sets forth the approved methods for testing blood, urine and bodily...

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Forensic Science and Fingerprints

Image via CrunchBaseWith a new analytical technique, a fingerprint can now reveal much more than the identity of a person. It can now also identify what the person has been touching drugs, explosives or poisons, for example.Writing in Friday’s issue of the journal Science, R. Graham Cooks, a professor of chemistry at PurdueUniversity, and his colleagues describe how a laboratory technique known as mass spectrometry could find a wider application in crime investigations.The equipment to perform such tests is already commercially available, although expensive. Smaller, cheaper, portable versions are probably only a couple...

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