1. Home
  2. Blog
  3. UPSC

New Non-Invasive Formaldehyde Sensor

Why is it in the news?

  • Researchers have developed a new, cost-effective formalin sensor designed to detect the presence of formaldehyde in adulterated fish.

·       Formaldehyde is a colourless, pungent gas used in various industrial processes, including as a preservative in some foods, notably in fish in developing countries.

·       Banned in many countries due to its carcinogenic nature.


Present Techniques for Detection

  • Commercial formalin sensors for fish traditionally rely on either electrochemical or colorimetric principles.
  • Electrochemical sensors are effective but often expensive, while colorimetric sensors are more budget-friendly.
  • Both methods are invasive and face challenges in achieving precise and selective detection, especially at low levels.


Characteristics of the New Non-Invasive Formaldehyde Sensor

  • Developed using tin oxide-reduced graphene oxide composite (rGO-SnO2).
  • Reduced graphene oxide (rGO) is known for detecting toxic gases, while tin oxide (SnO2) is recognized for its ability to detect formaldehyde.


  • The sensor employs a non-invasive technique for detecting formalin in adulterated fish.
  • Exhibits prolonged stability, ensuring consistent performance.
  • Has a low-level detection limit, enabling the identification of formaldehyde even at low concentrations.
  • The development is relatively cost-effective, making it a practical solution for widespread use.
  • Regarded as a breakthrough in the field of food adulteration, addressing issues associated with traditional detection methods.

Get free UPSC Updates straight to your inbox!

Get Updates on New Notification about APPSC, TSPSC and UPSC

Get Current Affairs Updates Directly into your Inbox

Discover more from AMIGOS IAS

Subscribe now to keep reading and get access to the full archive.

Continue reading