In a series of posts, we are going to talk about Mass Spectrometry.
- Introduction-The different configurations and the Electron Impact process
- What types of mass analyzers are there?
- What type of detectors are there?
- What types of analysis can be done?
- How do you read the output?
- How do they come to a qualitative measure using software?
- How do they quantitate the results?
- Do you need chromatography if you are using Mass Spectrometry?
- Other topics of interest about GC-MS
In this post, I would just like to list all of our past posts in both Gas and Liquid Chromatography regardless of the method of sample introduction or method of detection. They are in no particular order. Please enjoy.
- GC-MS is not perfect: The case study of methamphetamine
- Why do I see two peaks on my EtOH analysis using HS-GC-FID?
- What is the difference between HS-GC-FID and GC-MS?
- Drugs of Abuse (DOA) analysis performed today in the US
- Fool’s Gold or Real Gold? HS-GC-FID is it specific or selective or neither?
- What is a Gas Chromatography column and why should I care?
- The case for raw data: “Integration” in Gas Chromatography: How to make an innocent person guilty in a DUI case by manipulating the software
- What’s Salt Got to Do With It? Salting Out Effect
- Why forensic science testing for DUI BAC determination is the silly sister of analytical science: Good Laboratory Practice
- A large problem in Gas Chromatography: No uniform standard for GC run position or composition
- Crimping a Headspace Vial in Gas Chromatography: How not putting the “lid on the jar” can lead to disaster in a DUI case
- Gas Chromatography and why is it is so important to Pennsylvania DUI arrests
- Why saying the sample was run on a gas chromatograph is nearly meaningless
- The Carry-over Effect: Lack of Blanks between tests leads to false positive or inflated BAC results
- If he was an analytical chemist or a DUI defense attorney he would say “Show me the separation!!”
- The variables of the Gas Chromatography process
- In analytical chemistry for ETOH and Drugs of Abuse determination, it is very true that the matrix is all around us but truly is ignored
- Personal bias is bad, but analytical bias spells disaster in DUI BAC and Drugs of Abuse testing
- Carryover effect part Deux: Autodilution may be part of the problem for false blood results in DUI
- Internal standard the likely culprit for inaccurate BAC results
- Carryover effect part 3: Flushing of inert gas is not enough to prove there is no carryover
- How do they make the squiggly lines turn into a magic number: Area under the peak
- When tall and skinny is always beautiful? Fundamental principles of gas chromatography
- Is it legitimate for a crime laboratory to use ‘historical data’ to prove its test results are valid?
- The discretion exercised every day and with every test in forensic science
- Why doesn’t your state crime laboratory use AMDIS?
- False Conclusions and False Convictions: Attempts of Elucidating Pharmacodynamic Effect from an Analytical Chemistry Result-How Solely an Analytical Chemistry Result in a DUID Prosecution Cannot Scientifically Support a Conclusion of Driving Under the Influence of Drugs
- What is a Gas Chromatography column and why should I care?
- Exercise of Discretion: Sampling versus Sample Selection
- CRMs: Reference materials and standards
The McShane Firm | DUI Lawyers
Pennsylvania DUI Blog
Ed Lancaster says:
Tim, I am not surprised at what I learned on your blog since it only one of the ways that “To protect and Serve” goes against the original intent. In Our area and I am sure that throughout the US there is the tow truck scam. Where I live, Kenner, La, (suburban New Orleans), the typical cost to have your car towed is about $75.00 no matter who you call. If the police have your car towed, and, (you are not given any options), the tow company, either Moon, or Rock and Roll charge you $300.00 and tow it only to their yard where you are charged $20.00 a day for storage. I know several people who have suffered this ripoff and I can’t get anyone to investigate it. The police will certainly not and the media won’t either. Keep up the good fight on your part.
Ed Lancaster.
504-250-2151