Confirmatory Technique
Definition
An instrumental method capable of identifying a specific molecule with sufficient selectivity to be admissible in court. The accepted gold standards are GC-MS and LC-MS/MS for organics, ICP-MS for metals, and FTIR or Raman for solid-state materials such as paints, polymers and explosives.
Related terms
- Hyphenated Technique
- A single workflow that couples a separation method to a spectroscopic detector, so a complex mixture is resolved and each component identified...
- Instrumental Technique
- An analytical method that uses an instrument to detect, identify or quantitate an analyte, distinguished from classical wet-chemistry methods such as titration,...
- Limit of Detection (LOD)
- The lowest concentration of analyte that produces a signal reliably distinguishable from the instrument noise, conventionally three times the standard deviation of...
- Presumptive Test
- A fast, low-cost, class-specific screen used to triage a caseload before instrumental work begins. Examples are Marquis reagent for opioids and amphetamines,...
- Sample Preparation
- The set of steps between the sealed evidence container and the instrument autosampler vial: extraction, clean-up, concentration, derivatisation, dilution, internal standard addition....
Explained in
- Introduction and Scope of Instrumental Techniques in Forensic ScienceAn instrumental method capable of identifying a specific molecule with sufficient selectivity to be admissible in court. The accepted gold standards are GC-MS...