Limonene 5ppb, Isoprene 120ppb O3 20ppb 25.09.2009.

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Presentation transcript:

Limonene 5ppb, Isoprene 120ppb O3 20ppb

The number background is increasing slowly, it was 30p/cc yesterday!.. There are no spikes in NOx though!!

One possibility is that the valve does not fully turn to the fill position and allows for some return particles: the final fill had a bigger spike and the valve needed some assistance to fully turn

17min ALO

27min ALO (18k p/cc, 120ppb Isoprene) 22k p/cc 60ppb Isoprene, 42k p/cc zero Isoprene

35min ALO (champDMPS mass 1.8ug/m3, mode 48nm)

1h ALO

4h ALO

No spikes in post exp!!

Number overview