Effects of Iron Oxides on the Determination of Organic and Elemental Carbon using Thermal Optical Techniques Kochy Fung AtmAA, Inc., Calabasas, CA, USA.

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Presentation transcript:

Effects of Iron Oxides on the Determination of Organic and Elemental Carbon using Thermal Optical Techniques Kochy Fung AtmAA, Inc., Calabasas, CA, USA

Speciation Principles NIOSH or IMPROVE OC is measured in He atmosphere. EC is the fraction of particulate carbon that is measured in O 2 /He atmosphere when the laser signal is at the same level as the initial value. Laser R or T for pyrolysis correction

NIOSH Method Thermal volatilization, with pyrolytic correction by laser transmittance (T) 4 OC peaks: 250 o, 400 o, 550 o, & 900 o C in He (volatilization) 5 EC peaks: 600 o, 675 o, 750 o, 825 o & 920 o C in 2%O 2 /He (oxidation)

NIOSH thermogram

IMPROVE Method Thermal volatilization, with pyrolytic correction by laser reflectance (R) 4 OC peaks: 120 o, 250 o, 450 o, & 550 o C in He (volatilization) 3 EC peaks: 550 o, 700 o, & 800 o C in 2%O 2 /He (oxidation)

IMPROVE thermogram

Hypothesis for Difference in EC NIOSH >700 o C for OC cause volatilization or oxidation of light absorbing carbon. Fe 2 O 3 (& other metal oxides) as [O] donors or catalyst

Soot Generation UC-Davis :

Quartz filter, Fe oxides (~40nm) No acetylene in gas stream:

Quartz filter, Soot only No Fe(CO) 5 in gas stream:

Quartz filter, Soot + Fe Oxides Ethylene + Fe(CO) 5 + Acetylene:

NIOSH - Filter Blank Flat laser R and T:

NIOSH - Fe Oxides Dipping of laser R and T up to ~750 o C No residue after analysis

NIOSH - Soot only Flat laser R and T until >700 o C Light absorbing C in OC-4 EC under O 2 /He conditions

NIOSH - Soot with Fe Oxides Changes in laser R and T as in Fe-only filter No EC under O 2 /He conditions - all as OC-4

IMPROVE - Fe Oxides Laser R and T dip & rise in He & O 2 /He Orange residue after analysis

IMPROVE - Soot only Flat laser R and T until in O 2 /He EC profile approximates NIOSH - 2 peaks Broad EC - slow [O] rate

IMPROVE - Soot + Fe Oxides Laser R and T show features of Fe-only filter EC profile - sharper EC-1 peak (catalysis)

Summary I ron oxides in the sample attenuated laser signals in thermal optical techniques. May interfere with pyrolysis correction process. Oxidized EC at o as OC-4 in NIOSH. Catalyzed EC oxidation at 550 o in O 2 /He in IMPROVE.

Implications Other inorganic particles may have similar effects as iron oxides. Effects may be significant with dust storm samples. NIOSH results may be more appropriate to define EC by laser T signal only.