GROUND-BASED CHEMISTRY IN BENIN

Measurements of VOCs

Why?

• Scarcity of measurements in the region– Southern Africa– North Africa– Central Africa – East Africa

• Aircraft measurements are relatively coarse

Where?Djougou

(Dominique Serça, Fabienne Lohou, Cathy Liousse, Aérologie Laboratoire, Toulouse, France)

What?

Organic gas phase species

– Biogenic

– Combustion products

How?

• Local botanist

• Collect samples

• Analyse by GC-MS

Tube microsampler (TMS)

• Mass flow controller,• Timing control• Peltier temperature controller

Isoprene Monoterpenes

GC-MSSeparation

GC-MSIdentification

Proposed Sampling Strategy

• Survey

• Diurnal profile

• Intensive

• Emission rates