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Drug Concentrations: Measurements01:23

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Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
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Net Weights: Visualizing and Quantifying their Contribution to Drug Background Levels in Forensic Laboratories.

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Aerosol Science

Background:

  • Drug background contamination in forensic laboratories is a known issue.
  • The specific processes contributing to this background, particularly particulate spread during weighing, remain under-researched.
  • Understanding these mechanisms is crucial for accurate analysis and laboratory safety.

Purpose of the Study:

  • To investigate and visualize the spread of simulant drug particulate during the net weighing process.
  • To quantitatively analyze the extent and distribution of particulate contamination.
  • To identify weighing as a potential primary source of laboratory drug background and exposure.

Main Methods:

  • Modeling the net weight process using three different powder masses (0.2 g, 2 g, 100 g).
  • Qualitative analysis using laser light sheet videography for flow visualization.
  • Quantitative analysis involving sampling with cotton swabs and quantification using Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).

Main Results:

  • Particulate spread was observed up to 61 cm (24 in) from the weighing area for all tested masses.
  • Surface concentrations were highest immediately around the weighing paper.
  • The extent of aerosolization and transport was directly dependent on the mass of the material being weighed.

Conclusions:

  • The process of weighing drugs in forensic laboratories is a significant contributor to laboratory drug background.
  • Particulate spread during weighing presents a potential inhalation exposure risk for laboratory personnel.
  • Minimizing particulate dispersion during weighing is essential for maintaining laboratory integrity and safety.