eprintid: 1620
rev_number: 8
eprint_status: archive
userid: 1
dir: disk0/00/00/16/20
datestamp: 2001-07-10 00:00:00
lastmod: 2014-04-03 10:59:03
status_changed: 2012-08-14 15:01:55
type: doctoralThesis
metadata_visibility: show
creators_name: Hanisch, Friedrich
title: Heterogeneous Reactions of Nitric Acid and Dinitrogen Pentoxide on Mineral Dust Surfaces: A Knudsen Reactor Study
title_de: Heterogene Reaktionen von Salpetersäure und Distickstoffpentaoxid auf Mineralstaub: Eine Knudsen-Reaktor-Studie
ispublished: pub
subjects: 530
divisions: 130500
adv_faculty: af-13
keywords: Knudsen-Reaktor , Knudsenzelle , Mineralstaub , DistickstoffpentaoxidKnudsen reactor , nitric acid , dinitrogen pentoxide , mineral dust
cterms_swd: Salpetersäure
abstract_translated_text: The heterogeneous reactions of nitric acid and dinitrogen pentoxide with various  authentic dust, mineral and clay mineral surfaces has been investigated my means  of the Knudsen reactor techique at room temperature. Authentic dust surfaces  from the Saharan, the Chinese and the Arizona dust regions were used as  substrates, as were the minerals and clay minerals: aluminium oxide, calcite,  dolomite, feldspar; kaolinite, chlorite, illite, smectite, montmorillonite and  palygorskite. The uptake of both trace gases was investigated at concentrations  as low as 10^9 cm^-3 (HNO3) and 10^10 cm^-3 (N2O5) and found to be large and  irreversible. For HNO3 uptake coefficients of the order of 0.1 werde determined.  Uptake coefficients of N2O5 were between 0.02 and 0.001. Water was found to have  some influence onto the uptake coefficient, though this depended on the  substrate used. It was observed that diffusion into the pores of the sample bulk  can be relevant for N2O5; this has to be considered in the calculation of the  uptake coefficient. For HNO3 pore diffusion is unimportant. These results  strongly suggest that mineral aerosol can redistribute nitrate from the gaseous  to the particulate phase, modifying tropospheric photochemical cycles involving  NOx and NOy.
abstract_translated_lang: eng
date: 2001
date_type: published
id_scheme: DOI
id_number: 10.11588/heidok.00001620
ppn_swb: 164321506X
own_urn: urn:nbn:de:bsz:16-opus-16208
date_accepted: 2001-06-27
advisor: HASH(0x564e1c6cf718)
language: eng
bibsort: HANISCHFRIHETEROGENE2001
full_text_status: public
citation:   Hanisch, Friedrich  (2001) Heterogeneous Reactions of Nitric Acid and Dinitrogen Pentoxide on Mineral Dust Surfaces: A Knudsen Reactor Study.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/1620/1/all.pdf