lecture 4 illicit explosions

how is shock sentitivity increased

no control of starting material impurity profile

when are clandestine explosions often used

in terrorist attacks

what causes runaway chemical reaction

minimal temp control in exothermic synthesis

what is an example of a common clandestine explosion

acetone peroxide

what forms of acetone peroxide are there

dimer and trimer

what is the oxygen balance of the trimer form

C9H18O6

when acetone peroxide detonates what is formed

acetone and ozone

what chemical explosion doesnt obey KW rules

acetone peroxide

why doesnt acetone peroxide follow KW rules

the calculated heat of explosion is positive w

waht type of explosion is acetone peroxide

endothermic

what detection methods CAN NOT detect TATP

HPLC, GC-MS, UV-VIS

what chemical can detect TATP

peroxidase enxyme

what happens when you shine UV light on TATP

decomposes into starting products

what do you do after shining UV light on TATP

hydrogen peroxide test

when was TATP used as an explosive

1980s

what was the explosive used in the 2005 underground bombings

TATp

what casued the 2017 parson green bombing to fail

incorrect TATP mixture w

what is the annie bomb

ANFO and nitrobenzene

what is semtex

RDX/PETN

what was the european alternative of the C4 EXPLOSIVE IN 1960

semtex

what is an explosive taggant

additive that provides traceable signature

when are explsive taggants used

illicit use of militaty or industrial grade explosives

what are 4 qualities a taggant needs to have

• volatile

• not used in other applications

• sensitive to detection before and after explsion

• scent that dog can pick up

what is an example of an explsoive taggant

DMNB, ethylene glycol dinitrate

what are pre detonation taggants used fro

preventing attacking

what happens in the ion mobility spec

mols are ionised by electric field

what is the advantage of ion mobility spec

faster separation of component than GC or LC

what can ion mobility spec be paired with

TOF or quadruple MS

what does drift gas do

affect larger molecules helping for efficent separation

why is drift gas inert

to prevent reactions

what is the ion mobility spec equation

k = Vd/E

what is K

ion mobility

what is Vd

drift velocity in the gas

what is E

electric field

what affects ion mobility

• reduced mass of ion

• number density of drift

• collision cross section

• charge on ion

what is this equation

ion mobility with facotrs affecting it

what does this represent

reduced mass of the ion

what does this represnt

collision cross section, probability of collision wiht drift gas

what does n mean

number of densitiy of drift gas ( mols/vol)

what does Q mean

charge on the ion

how do you make gun cotton at gome

cellulose treated with nitric acid