Fourier transform infrared spectroscopy of size-segregated aerosol deposits on foil substrates

Judith A. Hopey; Kirk A. Fuller; Venkataramanan Krishnaswamy; David Bowdle; Michael J. Newchurch

doi:10.1364/AO.47.002266

Applied Optics
Vol. 47,
Issue 13,
pp. 2266-2274
(2008)
•https://doi.org/10.1364/AO.47.002266

Fourier transform infrared spectroscopy of size-segregated aerosol deposits on foil substrates

Judith A. Hopey, Kirk A. Fuller, Venkataramanan Krishnaswamy, David Bowdle, and Michael J. Newchurch

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Judith A. Hopey, Kirk A. Fuller, Venkataramanan Krishnaswamy, David Bowdle, and Michael J. Newchurch, "Fourier transform infrared spectroscopy of size-segregated aerosol deposits on foil substrates," Appl. Opt. 47, 2266-2274 (2008)

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- Atmospheric and oceanic optics
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About this Article
History
- Original Manuscript: September 11, 2007
- Revised Manuscript: March 3, 2008
- Manuscript Accepted: March 4, 2008
- Published: April 25, 2008

Abstract

A method based on Fourier transform infrared (FTIR) double-pass transmittance spectroscopy was developed for determining functional group loading in size-segregated ambient aerosol deposits. The impactor employed for sample collection utilized rotating stages, which produced uniform particulate matter (PM) deposits on standard Al foil substrates. Each sample was analyzed without extraction using an FTIR spectrometer equipped with a reflectometer accessory. The use of the reflectometer obviated the need for infrared window materials as substrates. $({NH}_{4})_{2} {SO}_{4}$ aerosol generated under laboratory conditions were used to calibrate deposit mass to the band strength of the relatively isolated $ν_{4}$ bending mode of ${SO}_{4}^{2 -}$ centered near $620 {cm}^{- 1}$ . Atmospheric PM was sampled during the summer of 2004 in Huntsville, Ala. Sulfate concentrations determined in this initial study correlated well with measurements made by collocated EPA air samplers.

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Stage	No. of Holes	Cutpoint	Physical Diameter	Days ${SO}_{4}$ Detected
inlet	1	$> 18$	$> 14$	0
1	1	$10. - 18$	$7.5 - 14$	0
2	10	$5.6 - 10 .$	$4.2 - 7.5$	0
3	10	$3.2 - 5.6$	$2.4 - 4.2$	0
4	20	$1.8 - 3.2$	$1.3 - 2.4$	7
5	40	$1.0 - 1.8$	$0.73 - 1.3$	20
6	80	$0.56 - 1.0$	$0.40 - 0.73$	22
7	900	$0.32 - 0.56$	$0.22 - 0.40$	21
8	900	$0.18 - 0.32$	$0.12 - 0.22$	22
9	2000	$0.10 - 0.18$	$0.063 - 0.12$	22
10	2000	$0.056 - 0.10$	$0.032 - 0.063$	10

Moiety	Stage 10	Stage 7	Stage 5
${SO}_{4}^{2 -}$	620, 1120	622, 1131	620
${NH}_{4}^{+}$	1427, 2800–3350	1427, 2800–3350	1427, 2800–3350
Soil	—	—	547, 1045, 3629
O-ring grease	821, 1000–1150, 1266, 2970	821, 1000–1150, 1268, 2970	822, 1000–1150, 1275, 2968

Stage	1 Aug	7 Aug	13 Aug	19 Aug	25 Aug	31 Aug
1	—	—	—	—	—	—
2	—	—	—	—	—	—
3	—	—	—	—	—	—
4	—	—	—	—	—	0.20
5	—	0.05	0.47	0.27	0.07	1.79
6	1.12	1.46	0.46	2.80	0.57	2.65
7	2.27	3.83	3.32	4.65	1.44	4.83
8	1.60	2.86	2.73	1.09	2.38	1.81
9	0.38	1.26	1.22	0.13	1.40	1.50
10	0.36	0.13	—	—	—	0.56

Stage	First	Seventh	Thirteenth	Nineteenth	Twenty-fifth	Thirty-first
1	—	—	—	—	—	—
2	—	—	—	—	—	—
3	—	—	—	—	—	—
4	—	—	—	–	—	7.16
5	—	1.90	17.4	9.60	2.61	74.4
6	43.7	59.1	16.8	127.	21.2	119.
7	98.4	188.	157.	243.	57.9	255.
8	65.6	130.	123.	42.6	104.	75.6
9	13.7	50.1	48.1	4.65	56.1	60.9
10	13.0	4.56				20.7
Sum	234	434	363	427	242	613
$C_{MOUDI}$	3.96	7.34	5.13	7.21	4.09	10.4
$C_{E P A}$	5.08	7.54	5.43	10.6	6.21	14.2

Stage	No. of Holes	Cutpoint	Physical Diameter	Days ${SO}_{4}$ Detected
inlet	1	$> 18$	$> 14$	0
1	1	$10. - 18$	$7.5 - 14$	0
2	10	$5.6 - 10 .$	$4.2 - 7.5$	0
3	10	$3.2 - 5.6$	$2.4 - 4.2$	0
4	20	$1.8 - 3.2$	$1.3 - 2.4$	7
5	40	$1.0 - 1.8$	$0.73 - 1.3$	20
6	80	$0.56 - 1.0$	$0.40 - 0.73$	22
7	900	$0.32 - 0.56$	$0.22 - 0.40$	21
8	900	$0.18 - 0.32$	$0.12 - 0.22$	22
9	2000	$0.10 - 0.18$	$0.063 - 0.12$	22
10	2000	$0.056 - 0.10$	$0.032 - 0.063$	10

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Applied Optics