Diatoms

Diatoms are single-celled algae (phylum Bacillariophyta) characterised by intricate silica-based cell walls (frustules) enabling rapid identification through microscopic examination. The diatom analysis approach provides objective indicators of environmental water quality, freshwater/saltwater origin determination, and forensic evidence linking individuals to specific aquatic locations.

Diatom characteristics include silica frustule structures resistant to degradation enabling detection in biological samples weeks or months after deposition, intricate geometric patterns enabling species identification through trained microscopic examination, and species-specific habitat preferences (freshwater, brackish, saltwater; flowing vs. stagnant) enabling environmental characterisation. Frustule dimension and morphology provide distinctive signatures enabling species discrimination.

Forensic applications include drowning investigation where diatom presence in lung tissues indicates antemortem water aspiration confirming drowning versus post-mortem water immersion, geographic origin determination identifying specific water bodies through characteristic diatom communities, and victim-location linking identifying diatoms in clothing or hair indicating aquatic environment exposure. Diatom analysis provides objective evidence supplementing conventional autopsy findings.

Environmental monitoring employs diatom communities as bioindicators of water quality — sensitive species presence indicates clean water, pollution-tolerant species dominance indicates contamination. Longitudinal monitoring reveals water quality changes tracking pollution source effects.

Collection procedures involve water sampling preserving specimens in fixative preventing degradation during transport to analysis facility. Mounting procedures create permanent slides enabling repeated examination and expert verification.

In Pakistan, diatom analysis supports forensic pathology and environmental water quality assessment.

Tactical Supply Pakistan supplies diatom analysis services for forensic and environmental applications.