Chemische Charakterisierung und Spurenanalytik
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Organisationseinheit der BAM
- 1 Analytische Chemie; Referenzmaterialien (257) (entfernen)
Eingeladener Vortrag
- nein (257) (entfernen)
An overview of personal experience with laser-induced plasma (LIP) will be given. The combination of LIP with laser-induced fluorescence, atomic absorption, Raman spectroscopy and spatial heterodyne spectroscopy for elemental and isotopic analysis will be discussed. Unusual applications of LIP will be covered, such as LIP-based lasers and LIP-based chemical reactors.
This course will provide an introduction to plasma diagnostic techniques. The major focus of the course will be on the discussions of the practical procedures as well as the underlying physical principles for the measurements of plasma fundamental characteristics (e.g., temperatures, thermodynamic properties, and electron number density). Particular emphasis will be placed on inductively coupled plasma–atomic emission spectrometry, but other analytical plasmas will also be used as examples when appropriate. Selected examples on how one can manipulate the operating conditions of the plasma source, based on the results of plasma diagnostic measurements, to improve its performance used for spectrochemical analysis will also be covered. Topics to be covered include thermal equilibrium, line profiles, temperatures, electron densities, excitation processes, micro reactions, pump and probe diagnostics, tomography,
temporal and spatial resolution. Basis of plasma computer modeling will be presented.
Sr isotope ratio analysis
(2023)
Pb isotope ratio analysis
(2023)
Detector deadtime
(2023)
Isotope Ratio Analysis
(2023)
Die NMR-Spektroskopie ist eine der zentralen nicht-invasiven Analysenmethoden in der organischen Chemie und aus dem Laboralltag nicht mehr wegzudenken. Die direkte Proportionalität zwischen der Anzahl der Atomkerne im Messvolumen und der Signalfläche im Spektrum ist vergleichbar mit einem „Zählen der Kernspins“. Der Kalibrieraufwand für die Quantifizierung ist minimal und aus dem NMR-Spektrum sind Informationen zu Struktur und Identität zugänglich.
Online-NMR-Spektroskopie wird unter Zuhilfenahme von speziellen Durchflussproben-köpfen und Messzellen bereits seit Jahrzehnten erforscht und eingesetzt. Durch die hohen Anforderungen an die Aufstellung und den Betrieb von klassischen Hochfeld-NMR-Spektrometern konnte sie allerdings nie den Sprung vom Labor in den Prozess schaffen. Dies hat sich durch die Entwicklungen im Bereich mobil einsetzbarer Benchtop-NMR-Spektrometer grundlegend verändert. Geringere Investitions- und Betriebskosten, sowie die Robustheit und einfache Bedienbarkeit dieser Systeme sind entscheidende Faktoren. Damit rückt eine Anwendung als Online-PAT-Methode technisch in greifbare Nähe. Designierte Prozess-NMR-Spektrometer sucht man heutzutage allerdings auf dem Markt meist noch vergebens.
Die Reaktionsverfolgung im Labormaßstab konnte an unterschiedlichen Systemen erfolgreich demonstriert werden. Dabei zeigten sich allerdings Limitierungen in Hinblick auf einen möglichen Prozesseinsatz. Insbesondere die Temperaturempfindlichkeit der Magnetsysteme ist hier zu nennen. Anhand eines Prototyps wurde eine aktive Temperaturisolation mittels temperierter Luftströmungen entwickelt und erprobt.
Eine Feldintegration von Laborsystemen geht sowohl technisch als auch regulatorisch mit zahlreichen Herausforderungen einher. Das raue Umfeld von Produktionsanlagen, sowie die Anforderungen an Explosionsschutz erfordern eine zugelassene Einhausung. Auf Basis von Erfahrungen mit einem ersten Prototyp erfolgte die gemeinsame Entwicklung eines möglichst flexibel einsetzbaren Analysenschranks. Neben der Hardware-Integration sind die automatisierte modellbasierte Auswertung der NMR-Spektren, sowie die Einbindung in die Prozessleittechnik essenziell für einen zuverlässigen Betrieb als PAT-Analysengerät.
Referenzmaterialien sind unter anderem ein wichtiges Werkzeug zur Qualitätskontrolle von Messungen bestimmter Merkmalswerte. Dabei ist zu berücksichtigen, dass zertifizierte Merkmalswerte immer eine gewisse Unsicherheit haben. Die Ermittlung dieser Unsicherheitsbeiträge ist Gegenstand des Vortrags. Referenzmaterialien sind gleichzeitig ein wertvolles Werkzeug zur Ermittlung der Unsicherheit von Messverfahren und -Analysen unbekannter Proben. Die Vorgehensweise bei der Ermittlung der Messunsicherheit mit Hilfe eines Referenzmaterials wird beschrieben.