A new concept for effective sampling and detecting HME powder traces is
described. The collection is based on the particles mobility under rotation into an
accumulation collector unit, followed by sequential transfer to the electrochemical
detection system where surface washing yields a higher concentration at room
temperature. The electrochemical detection of the peroxide explosives is based on
photochemical degradation or acid treatment resulting in hydrogen peroxide which
is sensed by a Prussian-blue (PB) modified strip electrode at a low potential.
Nitrates such as Urea Nitrate are detected using unique reactions which generate
one product which has a specific electrochemical signature. Nitroaromatics,
nitramines and nitroesters are detected. The new "Add and Detect" procedure is
operator independent and is the safest as the operator.