26 research outputs found
Requalification et réhabilitation. Fabrique Chocolat Villars à Fribourg. Parc technologique, école de postformation, musée industriel
No full textStrengthening of reinforced concrete beams for shear using FRP composites
No full textThesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.Includes bibliographical references (leaves 101-104).by Jean-Daniel Berset.M.S
Structure Elucidation in Water Analysis – A Need? Highlights of Analytical Sciences in Switzerland
Get PDFAnalysis of Nitro Musk Compounds and Their Amino Metabolites in Liquid Sewage Sludges Using NMR and Mass Spectrometry
No full textDetermination of Sources and Emissions of Persistent Organic Contaminants by Means of Sewage Sludge: Results from a Monitoring Network
No full textAre Lake Thun and Lake Brienz Contaminated with Explosive Residues? Highlights of Analytical Chemistry in Switzerland
No full textConsiderations about the enantioselective transformation of polycyclic musks in wastewater, treated wastewater and sewage sludge and analysis of their fate in a sequencing batch reactor plant
No full textPolyzyklische Moschus-Verbindungen : einträge ins Abwasser und Verhalten in der Kläranlage
No full textAssessment of total uncertainty in cocaine and benzoylecgonine wastewater load measurements
No full textTo check the effectiveness of campaigns preventing drug abuse or indicating local effects of efforts against drug trafficking, it is beneficial to know consumed amounts of substances in a high spatial and temporal resolution. The analysis of drugs of abuse in wastewater (WW) has the potential to provide this information. In this study, the reliability of WW drug consumption estimates is assessed and a novel method presented to calculate the total uncertainty in observed WW cocaine (COC) and benzoylecgonine (BE) loads. Specifically, uncertainties resulting from discharge measurements, chemical analysis and the applied sampling scheme were addressed and three approaches presented. These consist of (i) a generic model-based procedure to investigate the influence of the sampling scheme on the uncertainty of observed or expected drug loads, (ii) a comparative analysis of two analytical methods (high performance liquid chromatography-tandem mass spectrometry and gas chromatography-mass spectrometry), including an extended cross-validation by influent profiling over several days, and (iii) monitoring COC and BE concentrations in WW of the largest Swiss sewage treatment plants. In addition, the COC and BE loads observed in the sewage treatment plant of the city of Berne were used to back-calculate the COC consumption. The estimated mean daily consumed amount was 107 ± 21 g of pure COC, corresponding to 321 g of street-grade COC
