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  • Chromatographie, Dünnschicht  (2)
  • EARTH SCIENCE 〉 HUMAN DIMENSIONS 〉 ENVIRONMENTAL GOVERNANCE/MANAGEMENT 〉 WATER MANAGEMENT  (1)
  • 2020-2023  (1)
  • 1970-1974  (2)
  • 1955-1959
  • 1935-1939
  • 1
    Electronic Resource
    Electronic Resource
    Zinkstaubdestillation im Mikrogrammbereich (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 102-108 
    Details
    ISSN: 1618-2650
    Keywords: Zinkstaubdestillation ; Ultramikrobereich, Apparatur, TAS-Verfahren. Thermofraktographie, TAS-Verfahren ; Chromatographie, Dünnschicht ; Zinkstaubdestillation, Ultramikrobereich. Analyse von Naphthalinderivaten, Anthracenderivaten, Phenanthrenderivaten, Tetracenderivaten, Indolderivaten ; Chromatographie, Dünnschicht ; Zinkstaubdestillation, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine Methode beschrieben, die es erlaubt, unter kontrollierten Bedingungen mit 20–200 μg Ausgangsmaterial eine Zinkstaubdestillation durchzuführen. Hierzu wird die Probe auf Cu-aktiviertes Zink in einer TAS-Patrone für einige Minuten auf 350–450° C erhitzt. Die dabei entstehenden sauerstofffreien Aromaten bzw. stabilen Heterocyclen werden durch einen Stickstoffstrom von 15 ml/min direkt auf den Startpunkt einer DC-Schicht transferiert. Anschließend wird chromatographiert und die auftretenden Reaktionsprodukte werden identifiziert. Zum Studium der Reaktionsvorgänge und der optimalen Temperaturbereiche dient die Thermofraktographie. Es sind Anwendungsbeispiele aus der Gruppe der Naphthalin-,Anthracen-, Phenanthren-, Tetracen- und Indolderivate gegeben.
    Notes: Abstract A method for zinc dust distillation of 20–200 μg of substance under controlled conditions is described. The sample is heated on copper-activated zinc up to 350–450° C for several minutes in a TAS-cartridge. The resulting oxygen-free aromatic resp. the stable heterocyclic components are transferred directly to the starting point of a TLC-plate by a stream of nitrogen at 15 ml/min and identified after chromatography. Thermography is applied to study the reaction process and to determine the optimal temperature ranges. Examples of application to the groups of naphthalene-, anthracene-, phenanthrene-,tetracene- and indol derivatives are listed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431149
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Schwefel- und Selendehydrierungen im Mikrogrammbereich (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 257-264 
    Details
    ISSN: 1618-2650
    Keywords: Schwefeldehydrierung, Selendehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren. Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Schwefel- und Selendehydrierung, Ultramikrobereich. Analyse von Sesquiterpenderivaten, Abietinsäure. Steroiden ; Chromatographie, Dünnschicht ; Schwefel- und Selendehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine Schnellmethode beschrieben, die es erlaubt, unter kontrollierten Bedingungen mit 50–300 μg Ausgangsmaterial eine gekoppelte Dehydratisierung und Schwefel- bzw. Selendehydrierung durchzuführen. Hierbei wird die Probe mit einer Kaliumhydrogensulfat-Schwefel- bzw. Selenmischung für einige Minuten bei vorbestimmten Temperaturen zwischen 160–400° C im TAS-Ofen bzw. Tasomat erhitzt. Die entstehenden Aromaten werden durch einen Stickstoffstrom von 10 ml/min direkt auf den Startpunkt einer DC-Schicht transferiert. Anschließend wird chromatographiert und die auftretenden Reaktionsprodukte werden identifiziert. Zum Studium der Reaktionsvorgänge und der optimalen Temperaturbereiche dient die Thermofraktographie. Es sind Anwendungsbeispiele aus der Sesquiterpen-, Diterpen- und aus der Steroidreihe gegeben.
    Notes: Abstract A rapid method is described which permits to carry out a coupled dehydratization and sulphur resp. selenium dehydrogenation with 50–300 μg of starting material under controlled conditions. The sample is heated on a potassium hydrogen sulphate-sulphur resp. selenium mixture at preselected temperatures of between 160–400° C for several minutes in the TAS-oven resp. the Tasomat. The resulting aromatic components are transferred directly to the starting point of a TLC-plate by a stream of nitrogen at 10 ml/min and the reaction products are identified after chromatography. Thermofractography is applied to study the reaction processes and to determine the optical temperature ranges. Examples of application to the groups of sesquiterpenes, diterpenes and steroids are listed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432826
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    Paper (German National Licenses)
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  • 3
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    Panta Rhei benchmark dataset: socio-hydrological data of paired events of floods and droughts (2022)
    GFZ Data Services
    Details
    Publication Date: 2022-06-16
    Description: Abstract
    Description: As the negative impacts of hydrological extremes increase in large parts of the world, a better understanding of the drivers of change in risk and impacts is essential for effective flood and drought risk management and climate adaptation. However, there is a lack of comprehensive, empirical data about the processes, interactions and feedbacks in complex human-water systems leading to flood and drought impacts. To fill this gap, we present an IAHS Panta Rhei benchmark dataset containing socio-hydrological data of paired events, i.e. two floods or two droughts that occurred in the same area (Kreibich et al. 2017, 2019). The contained 45 paired events occurred in 42 different study areas (in three study areas we have data on two paired events), which cover different socioeconomic and hydroclimatic contexts across all continents. The dataset is unique in covering floods and droughts, in the number of cases assessed and in the amount of qualitative and quantitative socio-hydrological data contained. References to the data sources are provided in 2022-002_Kreibich-et-al_Key_data_table.xlsx where possible. Based on templates, we collected detailed, review-style reports describing the event characteristics and processes in the case study areas, as well as various semi-quantitative data, categorised into management, hazard, exposure, vulnerability and impacts. Sources of the data were classified as follows: scientific study (peer-reviewed paper and PhD thesis), report (by governments, administrations, NGOs, research organisations, projects), own analysis by authors, based on a database (e.g. official statistics, monitoring data such as weather, discharge data, etc.), newspaper article, and expert judgement. The campaign to collect the information and data on paired events started at the EGU General Assembly in April 2019 in Vienna and was continued with talks promoting the paired event data collection at various conferences. Communication with the Panta Rhei community and other flood and drought experts identified through snowballing techniques was important. Thus, data on paired events were provided by professionals with excellent local knowledge of the events and risk management practices.
    Keywords: hydrological extremes ; risk dynamics ; human-flood system ; human-drought system ; socio-hydrology ; risk management ; flood ; drought ; EARTH SCIENCE 〉 HUMAN DIMENSIONS 〉 ENVIRONMENTAL GOVERNANCE/MANAGEMENT 〉 WATER MANAGEMENT ; EARTH SCIENCE 〉 HUMAN DIMENSIONS 〉 NATURAL HAZARDS 〉 DROUGHTS ; EARTH SCIENCE 〉 HUMAN DIMENSIONS 〉 NATURAL HAZARDS 〉 FLOODS ; EARTH SCIENCE SERVICES 〉 DATA ANALYSIS AND VISUALIZATION ; environmental assessment 〉 environmental risk assessment
    Type: Dataset , Dataset
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    DATA GFZ
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