Research and development of nitrogen dioxide diffusive samplers

Vaida Šerevičienė

Doctoral dissertation

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Technological sciences, environmental engineering (04T).

The thesis deals with the diffusive samplers for the measurement of gaseous air pollution concentration. Diffusive samplers are becoming more popular due to their simplicity, low cost and the possibility to locate in many places, including cities, regions or even different countries. Main aim of thesis is to improve the diffusive samplers for the detection of nitrogen dioxide, as well as to determine their sensitivity.

Main task has been solved in the work: it presents a complex study of impact of individual factors – length of diffusive samplers, impregnation ground, absorbing solution, ambient temperature and humidity. Objectives have been formulated according to the problem under analysis and looking for the information in foreign countries, and are related to the studies and modelling results.

The thesis consists of an introduction, five chapters, general conclusions and recommendations, lists of references and publications of authors on the topic and one addendum.

Introductory chapter discusses the exploratory problem, the relevance of work, describes the object of studies, presents the formulation of aim and objectives of the work, describes research methodology, scientific novelty, practical significance of results and defensive affirmations. Publications published by the author of thesis and reports at conferences, as well as thesis structure are presented at the end of the introduction.

The first chapter covers the analysis of scientific literature. It analyzes information on the formation and diffusion of nitrogen dioxide in ambient air, diffusive samplers, and peculiarity of their performance. The design of diffusive samplers, selective absorbent solutions and environmental factors affecting their performance has been analyzed as well. Software packages for the modelling of nitrogen dioxide dispersion in the air have been also discussed. The chapter ends with the formulation of conclusions and objectives. The second chapter presents the techniques of laboratory tests of diffusive samplers, analysis of results and conclusions. The third section provides the methodology of full-scale experimental researches, analysis of results and conclusions. The fourth chapter provides modelling techniques, comparison of the modelling results received with the results obtained during the researches, and gives conclusions. The fifth chapter describes the engineering solution.

7 articles have been published on the topic of thesis: two – in the journals which are referred in the Web of Science ISI database, two – in scientific journal referred in the other international databases, one – in International Lithuanian Conference material, one – in reviewed Lithuanian Conference material, and one – in non-reviewed Lithuanian conference material. 7 reports on the topic of thesis have been read at international and Lithuanian conferences.

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160×230 mm
148 p.
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