Detecting explosives

A dog sniffing in a suitcase

Source: Shutterstock

Simon Cotton takes a look at those compounds that find themselves in the news or relate to our everyday lives.

We're hearing a lot about Improvised Explosive Devices (IEDs) these days but what are they made from and how can we detect them?

All about TNT?

We're not always looking for trinitrotritoluene (TNT). A lot of the time sniffer dogs searching for landmines are actually detecting other molecules, like DNT (dinitrotoluene) and DNB (dinitrobenzene). DNTs are a regular impurity in TNT, which arise because some of the toluene molecules were not completely nitrated. Because it is a lighter molecule, the vapour pressure of DNT at room temperature is about 20 times that of TNT, so it's much more detectable.

Thanks for using Education in Chemistry. You can view one Education in Chemistry article per month as a visitor. 

A photograph of a teacher standing in a white lab coat, speaking with a class of children in a laboratory, is superimposed on a colourful background. Text reads "Teach Chemistry means support for classroom and staff room".

Register for Teach Chemistry for free, unlimited access

Registration is open to all teachers and technicians at secondary schools, colleges and teacher training institutions in the UK and Ireland.

Get all this, plus much more:

  • unlimited access to resources, core practical videos and Education in Chemistry articles
  • teacher well-being toolkit, personal development resources and online assessments
  • applications for funding to support your lessons

Already a Teach Chemistry member? Sign in now.

Not eligible for Teach Chemistry? Sign up for a personal account instead, or you can also access all our resources with Royal Society of Chemistry membership.