[PDF]    http://dx.doi.org/10.3952/lithjphys.49411

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 49, 471–478 (2009)

V. Ulevičiusa, D. Butkusb, K. Plauškaitėa, A. Girgždysb, S. Byčenkienėa, and N. Špirkauskaitėa
aInstitute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: ulevicv@ktl.mii.lt
bVilnius Gediminas Technical University, Saulėtekio 11, LT-10223 Vilnius, Lithuania

Received 6 October 2009; revised 19 November 2009; accepted 18 December 2009

In this study the effect of the air ionization by 85Kr beta radiation on the new particle formation and evolution of aerosol particle size distribution in the experimental chamber was investigated. During the experiments the interaction between air ionization and gas-to-particle conversion processes was distinctly observed. Results showed that the amplitude of the ionic current was dependent both on the chemical impurity concentration and the ionization source activity. Calculated values of parameters (growth and formation rates) of the particle nucleation process were larger when in the experimental chamber concentrations of SO2 and 85Kr were higher. The growth rate values (42.1 and 45.3 nm/h) were by one order of magnitude higher than the environmental ones (1.2–9.9 nm/h at the Preila station, Lithuania). Experimental data showed that after injection of high SO2 and 85Kr concentrations in the chamber during the 20 min interval nanometre-size particles created by nucleation were produced in large amounts. Thus, a larger amount of SO2 significantly influenced the formation of new particles. During the first 5 min the concentration of 10 nm particles increased by 3 orders of magnitude with the formation rate of 7.47 cm–3s–1. The formation rate of 0.06 cm–3s–1 in the experiment with the average ambient SO2 concentration (2–3 μμg/m3) was analogous to the environmental one (0.14 cm–3s–1). The coagulation sink (CoagS1,2,3\mathrm{CoagS_{1,2,3}}) was higher in the experiment with the ambient SO2 concentration and resulted in the lower concentration of particles. The smaller values of the coagulation sink at the higher concentration of SO2 gas have shown that these nano-particles in the air could persist for a longer time, probably in a stable size due to the ion charge.
Keywords: aerosol particles, experimental chamber, air ionization, nucleation characteristics, 85Kr, SO2
PACS: 92.20.Bk, 92.60.Mt, 68.55.AA

V. Ulevičiusa, D. Butkusb, K. Plauškaitėa, A. Girgždysb, S. Byčenkienėa, N. Špirkauskaitėa
aFizikos institutas, Vilnius, Lietuva
bVilniaus Gedimino technikos universitetas, Vilnius, Lietuva

Eksperimentinėje kameroje tirtas 85Kr beta spinduliuotės jonizacijos, sukeltos ore, poveikis aerozolio dalelių susidarymui ir jų dydžių spektrui. Aerozolio dalelių formavimuisi poveikį turėjo ir jonizacijos laipsnis, ir cheminės priemaišos (SO2) koncentracija. Įvedus į kamerą dideles SO2 ir 85Kr koncentracijas, per pirmąsias 20 min. aerozolio dalelių koncentracijos padidėjo net keliomis eilėmis. Ypač sparčiai aerozolio dalelių koncentracija padidėjo padidinus kameroje SO2 koncentraciją. Esant didesnei SO2 koncentracijai, greičiau formavosi ir aerozolio dalelės, o formavimosi greitis skyrėsi eile nuo stebimo gamtinėje aplinkoje (Preilos stotyje), atitinkamai 42,1–45,3 ir 1,2–9,9 nm/h. Aerozolio dalelių formavimosi greičiai eksperimento metu, esant padidintai jonizacijai ir SO2 koncentracijai (2–3 μμg/m3) kaip foninėje stotyje ore, buvo panašūs, atitinkamai 0,06 ir 0,14 cm–3s–1. Aerozolio dalelių koaguliacinis nuotėkis buvo didesnis eksperimente, kai SO2 koncentracija buvo lygi gamtinei. Kai buvo didelės SO2 ir 85Kr koncentracijos, aerozolio dalelių koaguliacinis nuotėkis buvo mažesnis, kas rodo, kad nanometrinių dydžių dalelės lėčiau pasišalino iš oro dėl koaguliacijos.

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