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Updated: Mar 25, 2026

Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems
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Fluorescent Dyes in Hydrological Tracing: Application Methods, Ecotoxicological Effects, and Safe Application Levels.

Carlos J A Campos1,2, Louis A Tremblay3, Olivier Champeau4

  • 1Jacobs, 47 Hereford Street Level 2, Wynn Williams Building, Christchurch 8013, New Zealand.

Journal of Xenobiotics
|March 24, 2026
PubMed
Summary
This summary is machine-generated.

Fluorescent dyes are vital hydrological tracers, but their ecological impacts require careful consideration. Dyes with high polarity and sulfonation exhibit low toxicity, supporting their continued use with responsible application practices.

Keywords:
contaminant tracingecotoxicologyhydrologyrhodaminerisk assessmentsafe application thresholds

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Hydrology

Background:

  • Fluorescent dyes are widely used in hydrology for tracing water movement.
  • Ecological risks associated with dye releases are not fully understood.
  • This review focuses on rhodamines, fluorescein, and sulfonated xanthene dyes.

Purpose of the Study:

  • To review the physico-chemical properties, environmental behavior, and ecotoxicological effects of common hydrological tracers.
  • To assess the ecological implications of fluorescent dye releases in aquatic systems.
  • To provide recommendations for minimizing environmental impact.

Main Methods:

  • Literature review of existing studies on dye characteristics, toxicity, and environmental fate.
  • Analysis of ecotoxicity data across various aquatic organisms (algae, invertebrates, fish).
  • Evaluation of regulatory frameworks and operational guidelines.

Main Results:

  • Significant inter-specific variability in dye toxicity observed.
  • Rhodamine B and eosin Y can cause adverse effects at high concentrations.
  • Highly sulfonated dyes (e.g., rhodamine WT, fluorescein) show low toxicity and bioaccumulation.
  • Environmental factors like photolysis and sorption affect dye fate and exposure.

Conclusions:

  • Fluorescent dyes can be used safely in hydrology with careful selection and application.
  • Further research is needed on transformation products, chronic effects, and cumulative exposure.
  • Recommendations include optimizing dye mass, injection design, and monitoring protocols.