Characteristics of Nuclepore filters with large pore size—II. Filtration properties

John, Walter; Hering, Susanne V.; Reischl, G.; Sasaki, Gen; Goren, Simon L.

doi:10.1016/0004-6981(83)90054-9

Cited by 124 publications

(61 citation statements)

References 15 publications

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“…The sample air flow rate was 16.7 L min −1 (1 atm, 25 • C). Under these conditions, the aerodynamic diameter of the 50 % cutoff for the nucleopore filter was approximately 1.9 µm (John et al, 1983). The samples were analyzed by ion chromatography (IC).…”

Section: Denuder-filter (D-f) Pack Methodsmentioning

confidence: 99%

Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia: synergetic observations and chemical transport model analysis

et al. 2017

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Section: Denuder-filter (D-f) Pack Methodsmentioning

confidence: 99%

Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia: synergetic observations and chemical transport model analysis

et al. 2017

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“…In our work, distinction between coarse and fine particles is operationally defined using stack filter units (SFU) samplers working at 1 m 3 h −1 with two filters of different pore size used as follows: Nuclepore 8.0 µm filters collect particles with aerodynamic diameters higher than 2 µm, while downstream 0.4 µm filters collect particles smaller than 2 µm (John et al, 1983). In order to maintain the cutoff and the analysis reliability, sampling duration is adapted to obtain aerosol loadings <500 µg/filter.…”

Section: Sampling Protocolmentioning

confidence: 99%

Geochemical perspectives from a new aerosol chemical mass closure

2007

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Abstract. The aerosol chemical mass closure is revisited and a simple and inexpensive methodology is proposed. This methodology relies on data obtained for aerosol mass, and concentration of the major ions and the two main carbon components, the organic carbon (OC) and the black carbon (BC). Atmospheric particles are separated into coarse (AD>2 µm) and fine (AD<2 µm) fractions and are treated separately. For the coarse fraction the carbonaceous component is minor and assumption is made for the conversion factor k of OC-to-POM (Particulate Organic Matter) which is fixed to the value of 1.8 accounting for secondary species. The coarse soluble calcium is shown to display a correlation (regression coefficient f , y axis intercept b) with the missing mass. Conversely, the fine fraction is dominated by organic species and assumption is made for dust which is assumed to have the same f factor as the coarse mode dust. The fine mode mass obtained from chemical analyses is then adjusted to the actual weighed mass by tuning the k conversion factor. The k coefficient is kept different in the two modes due to the expected different origins of the organic particles. Using the f and k coefficient obtained from the data set, the mass closure is reached for each individual sample with an undetermined fraction less than 10%. The procedure has been applied to different urban and peri-urban environments in Europe and in Beijing and its efficiency and uncertainties on f and k values are discussed. The f and k coefficients are shown to offer consistent geochemical indications on aerosol origin and transformations. f allows to retrieve dust mass and its value accounting for Ca abundance in dust at the site of investigation may serve as an indicator of dust origin and aerosol interactions with anthropogenic acids. f values were found to vary in the 0.08-0.12 range in European urban areas, and a broader range in Beijing (0.01-0.16). As expected, k appears to be a relevant proxy for particle origin and ageing and Correspondence to: H. Cachier (cachier@lsce.cnrs-gif.fr) varies in the 1.4-1.8 range. For Beijing, k exhibits high values of about 1.7 in winter and summer. Winter values suggest that fresh coal aerosol might be responsible for such a high k value, which was not taken into account in previous works.

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“…In the present work the fine particle fraction was collected on a 0.2-pm, and coarse particles on an 8.0-pm apiezon-greased Nuclepore filter. The flow rate was set to 4.3 L/min and collection time to 8 h. The face velocity on the first filter was kept at 30 cm/s, which gives the size cutoff at around 1.5 pm (John et al, 1983). Two parallel collectors were used in each measurement position and indoor and outdoor measurements were carried out simultaneously.…”

Section: Instrumentationmentioning

confidence: 99%

Indoor Air Aerosol Model: Transport Indoors and Deposition of Fine and Coarse Particles

Raunemaa

Kulmala

Saari

et al. 1989

Aerosol Science and Technology

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Characteristics of Nuclepore filters with large pore size—II. Filtration properties

Cited by 124 publications

References 15 publications

Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia: synergetic observations and chemical transport model analysis

Seasonal variation of fine- and coarse-mode nitrates and related aerosols over East Asia: synergetic observations and chemical transport model analysis

Geochemical perspectives from a new aerosol chemical mass closure

Indoor Air Aerosol Model: Transport Indoors and Deposition of Fine and Coarse Particles

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