Introduction to FIGAEROFilter Inlet for Gases and AEROsols

Penglin Ye, Andy Lambe, Mingyi Wang, Alex Vogel, Manjula Canagaratna, John Jayne, Douglas Worsnop

Outline

• Background

• How it works

• Application examples

Development of FIGAERO

Gas Sampling & Filter Loading

Gas inlet pump

Aerosol inlet pump

Filter Desorption

Gas inlet pump

Aerosol inlet pump

Hea

ted

zer

o N

2

Filter Replacement

Pall, Zeflour 2 um pore size, p/n 60048

EyeOn Control System

General Purpose Sequencing and Peripheral Controller and LoggerWrites data into HDF files

What basic information can we get with FIGAERO?

Gas phase

• 1. Traditional CIMS measurement, compositions, concentrations……

Particle phase

• 2. Vaporization. Particle phase chemical information.

• 3. Thermogram. Volatility

Gas phase measuring &

particle sampling (30 min)

Particle-phase thermal

desorption (15 min)

25 C

180 C

Heating begin

11

HR-ToF-MS

FIGAERO Application, ambient

12

HR-ToF-MS

FIGAERO Application, chamber

Monomer C10

Dimer C20

Trimer C30

14

HR-ToF-MS

FIGAERO Application, PAM (Potential Aerosol Mass)

α-pinene + OH , particle phase

10-1

100

101

102

103

104

105

700600500400300200100

m/Q (Th)

α-pinene 100ppb,photochemical ageing a few days

Major oxidation products in particle phase

8000

6000

4000

2000

0

ion

s/s

500480460440420400380360340320300280260240220200

m/Q (Th)

'all (TIC)'C4H2O4I-

C3H6O3I-

C3H4O4I-

C5H8O4I-

C5H8O5I-

C7H10O4I- C8H12O4I-

C8H12O5I- C10H16O4I-

C10H16O6I-

C10H16O5I-

C10H14O7I-

C10H14O8I-

α-pinene + OH , gas phase

8000

6000

4000

2000

0

ion

s/s

500480460440420400380360340320300280260240220200

m/Q (Th)

'all (TIC)'

C7H10O4I-

C10H14O8I-

C10H14O7I-

C10H16O6I-

C10H16O5I-

C10H16O4I-

C8H12O5I-

C8H12O4I-

C5H8O5I-

C5H8O4I-

HNO6I-

C8H12O4(NO3)-

C3H6O3I-

Comparing the MS of the gas and particle phase

-8000

-6000

-4000

-2000

0

2000

4000

6000

8000

500450400350300250200

Gas Phase

Paritcle Phase

apinene + OH + NO Average MS during FIGAERO desorption, m/Q = 200 - 500

• C8H12O4-5 and C10H16,18O4-6

• C10H15,17NO6-9 organic nitrates

2.0x104

1.5

1.0

0.5

0.0

ion

s/s

/ns T

OF

500480460440420400380360340320300280260240220200m/Q (Th) (not auto-updated after calibration)

IN2O6-

I*C8H12O4-

I*C10H16,18O5-

I*C10H15NO6-

I*C10H16O6-

I*C10H15NO7-I*C10H15NO8-

I*C10H15NO9-

I*C8H12O5-

I*C10H16O4-

Thermogram of the oxidation products

1.0

0.8

0.6

0.4

0.2

0.0

No

rm. si

gn

al

5:40 PM

2/16/2017

5:45 PM 5:50 PMUTC

'C10H16O4I-'

'C10H16O5I-'

'C10H16O6I-'

'C10H16O7I-'

'C10H16O8I-'

150

100

50

08:20 PM 8:22 PM

2/15/2017

8:24 PM 8:26 PM 8:28 PM 8:30 PM 8:32 PM 8:34 PM

Summary

1. FIGAERO can provide compositions, concentrations and other chemical information of the organics in both gas phase and particle phase.

2. The desorption sequence of the oxidation products demonstrate the volatility difference.