Abstract: A method to determine a mass of particles collected on a collection membrane having a first surface and a second surface. The particles to be analysed are deposited on the first surface. In a first step, the particles of the first surface are scanned with a Raman spectrometer and a preliminary Raman signal is collected. In a second step, at least one additional physical property of the particles is determined. In a third step, a correction factor is calculated based on the additional physical property. In a fourth step, a final Raman signal is calculated based on the correction factor and the preliminary Raman signal. In a fifth step the actual mass of the particles is determined based on the final Raman signal.

Abstract: A method to determine a mass of particles collected on a collection membrane having a first surface and a second surface. The particles to be analysed are deposited on the first surface. In a first step, the particles of the first surface are scanned with a Raman spectrometer and a preliminary Raman signal is collected. In a second step, at least one additional physical property of the particles is determined. In a third step, a correction factor is calculated based on the additional physical property. In a fourth step, a final Raman signal is calculated based on the correction factor and the preliminary Raman signal. In a fifth step the actual mass of the particles is determined based on the final Raman signal.

Abstract: Provided herein is a collection device for collecting nano particles conveyed in a fluid including: a fluid duct having a fluid inlet and a fluid outlet, a fluid propelling element propelling said fluid through the fluid duct, and a collection element which is arranged in said fluid duct for the collection of nano particles conveyed in said fluid. The collection element includes a collection surface and an enhancement structure arranged in connection with the collection surface. The nano particles are deposited in the region of said collection surface and said enhancement structure and the collection surface with the enhancement structure enhances the spectral properties of said nano particles for a facile analysis of the amount of collected nano particles.

Abstract: A filter device for filtering nano particles conveyed in a fluid in order to determine an exposure of the filter device to nano particles includes a support element having a top surface, a bottom surface, a lateral surface, and at least one fluid duct having a fluid inlet and a fluid outlet. The top surface and the bottom surface extend substantially parallel to each other. The filter device further includes at least one filter element with a collection surface on which the nano particles are to be deposited. The at least one filter element is arranged in the at least one fluid duct for collecting the nano particles conveyed in the fluid. The collection surface of the at least one filter element is oriented parallel to at least one of the top surface and the bottom surface.

Abstract: Provided herein is a collection device for collecting nano particles conveyed in a fluid including: a fluid duct having a fluid inlet and a fluid outlet, a fluid propelling element propelling said fluid through the fluid duct, and a collection element which is arranged in said fluid duct for the collection of nano particles conveyed in said fluid. The collection element includes a collection surface and an enhancement structure arranged in connection with the collection surface. The nano particles are deposited in the region of said collection surface and said enhancement structure and the collection surface with the enhancement structure enhances the spectral properties of said nano particles for a facile analysis of the amount of collected nano particles.