Müller, K.P.Rudolph, J.2010-06-112010-06-111991Anal. Chem., 339, 661-663.http://hdl.handle.net/10315/4211A modified filter technique to separate particles and gaseous HNO3 is described, which is based on the use of filters of the Millipore FPLG type in combination with a virtual impactor. It enables routine measurements of gaseous HNO3 in the atmosphere at background levels. Some results of measurements both in the marine background and over rural and semi-rural continental regions are presented.enThe original publication is available at www.springerlink.comArticlehttp://www.springerlink.com/content/106287/http://www.springerlink.com/content/w8808w0421248v81/fulltext.pdf