The Density of Uranine Aerosol Particles

Stein, F.; Esmen, Nurtan A.; Corn, Morton

doi:10.1080/00028896609342448

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…The values of da for each of the uranine calibration aerosols are given in Table II. The density of uranine is taken to be 1.46 g/cm3, which is the average of values reported in the literature for both bulk uranine (9,11,13) and uranine aerosol (10)(11)(12). With the exception of Stein (9), the density of uranine aerosol (10-12) was not found to be significantly different from the density of the bulk material.…”

Section: Resultsmentioning

confidence: 99%

“…The density of uranine is taken to be 1.46 g/cm3, which is the average of values reported in the literature for both bulk uranine (9,11,13) and uranine aerosol (10)(11)(12). With the exception of Stein (9), the density of uranine aerosol (10-12) was not found to be significantly different from the density of the bulk material. As the particles are spherical, the Stokes diameter is assumed to be equal to the microscopically measured diameter.…”

Section: Resultsmentioning

confidence: 99%

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Design and evaluation of a new low-pressure impactor. 2

Hering¹,

Friedlander²,

Collins³

et al. 1979

Environ. Sci. Technol.

182

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The last two stages of the low-pressure impactor described in Part 1 of this paper have been calibrated using a laboratory-generated uranine aerosol. An electrostatic classifier was used to obtain a near-monodisperse aerosol and the deposited material was analyzed by fluorescence. For the final three stages, the particle diameters collected with a 50% efficiency were found to be 0.12, 0.075, and 0.05 µ . These cutoff diameters are the aerodynamic particle diameters at the reduced stage pressures; the relation to the particle Stokes diameter is discussed.A low-pressure impactor has been developed which is capable of the size segregation of aerosols from 0.05 to 4.0 µ aerodynamic diameter. The design and previous laboratory and field evaluation of the impactor have been reported elsewhere (1). Presented here is the calibration of the 0.05and 0.075-µ stages of the impactor using a laboratory-generated uranine aerosol.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design and evaluation of a new low-pressure impactor. 2

Hering¹,

Friedlander²,

Collins³

et al. 1979

Environ. Sci. Technol.

182

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show abstract

“…In view of the comparable merits of the four methods of solution and the four filter arrangements, it was decided to average all results obtained under similar conditions and plot the results as cumulative spectra for comparison with the results of the electron microscope size analysis. Here a particle density of 1.4 g/cm3 was used (12). The results are shown in Figures 2 to 6.…”

Section: Evaluation Of Spectramentioning

confidence: 99%

Aerosol-size spectra by means of nuclepore filters

Melo¹,

Phillips²

1975

Environ. Sci. Technol.

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“…They claimed a minimum detectable uranine concentration of 10" n g/mL. Stein et al (1966) report that the fluorescence technique offers a limiting sensitivity of 10" 10 g/mL.…”

Section: 8mentioning

confidence: 99%

“…Schulz et al (1960) used uranine to measure stack emissions. Stein et al (1966) measured the density of uranine aerosol particles so that they can be used to calibrate an aerosol spectrometer. Stober and Flachsbart (1973) evaluated ammonium fluorescein as a laboratory test aerosol.…”

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confidence: 99%

Use of Fluorescein in Aerosol Studies

Kesavan¹,

Doherty²

2000

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Fluorescein has been used as a tracer in aerosol studies for the detection and quantification of aerosols. This report summarizes a sequence of experiments conducted to confirm our procedure used for the recovery and detection of fluorescein from filters. Our results confirmed the following: (1) The optimum excitation and emission wavelengths for fluorescein are 492 and 516 nm, respectively. (2) For fluorescence intensity (FI) measurements to be accurate, FI of a sample has to be significantly higher than the FI of water filled test tubes. (3) At higher gain settings, changes in the test tube orientation can affect the FI measurement of low fluorescence material. (4) Consistent alignment of the test tube in the fluorometer reduces the variation in FI measurements. (5) Below the self-quenching limit, the fluorometer readings increase linearly with increasing fluorescein concentrations. (6) After the pH of the recovery solution has reached 8, there is no significant effect on FI measurements for further increase in pH. (7) The change in pH does not affect the shape or the position of the peak of the emission spectrum. (8) Our procedure fully recovers fluorescein from glass fiber filters. (9) Fluorescein samples, prepared for fluorometer measurements, were stable over at least a 12 day period.

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The Density of Uranine Aerosol Particles

Cited by 11 publications

References 5 publications

Design and evaluation of a new low-pressure impactor. 2

Design and evaluation of a new low-pressure impactor. 2

Aerosol-size spectra by means of nuclepore filters

Use of Fluorescein in Aerosol Studies

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