Suchergebnisse

Recognized as a standard reference work for water experts, this successful handbook now is available in a revised 9th edition. Retaining its character as a handbook and reference book for practitioners, the book provides a broad overview of aspects of hydrogeology, chemistry, biology and microbiology

From the contents: Preface. Oral Presentations Topic 1 - Screening Strategies, Sampling and Sample Handling, Method Comparison -- Oral Presentations Topic 2 - Site Characterization -- Oral Presentations Topic 3 - Sensor Technologies, Physical and Chemical Methods -- Oral Presentations Topic 4 - Sensor Technologies, Biological Methods -- Mini-Symposium - Sample Preparation for On Site Analysis -- Poster Presentations -- Index of Authors.

Current legislations typically characterize systems of aerosols, such as from vehicle exhaust, primarily by number concentration and size distributions. While potential health threats have a dependence on the particle size, the chemical composition of particles, including the volatile and semi-volatile components adsorbed onto nonvolatile particle cores present at roadside and urban settings, is important in understanding the impact of exhaust particles on health. To date, the only tools suitable for an online in-depth chemical aerosol characterization are aerosol mass spectrometers, which are typically composed of complex and cost intensive instrumentation. We present a new analytical system, which combines a novel inexpensive infrared-radiation-based evaporation system (HELIOS) with a commercially available highly efficient atmospheric ionization source (SICRIT) connected to a rather low-price ion-trap mass spectrometer. Our inexpensive, robust and mobile aerosol characterization HELIOS/SICRIT/Mass Spectrometry system enables highly sensitive chemical analysis of particle-associated volatile substances. We validate the HELIOS/SICRIT/Mass Spectrometry system in laboratory experiments with coated particles generated under controlled conditions, and show that the system is capable of identification of combustion-generated polycyclic aromatic hydrocarbons and relative quantification of individual chemical species adsorbed on particle surfaces. We then employ our system to analyze real-world vehicle engine exhaust aerosol and show through time-resolved measurements with high time resolution (<10 s) that the chemical composition of the particles changes during different parts of an engine test cycle. ; acceptedVersion ; Peer reviewed