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  • 1
    Electronic Resource
    Electronic Resource
    Trace enrichment and separation of metal ions as dithiocarbamate complexes by liquid chromatography (1987)
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 98-101 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00128a021
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  • 2
    Electronic Resource
    Electronic Resource
    Low-dispersion chemiluminescence detection for packed capillary liquid chromatography (1987)
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 1458-1461 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00137a018
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ageing processes of alkyl bonded phases in HPLC; a chromatographic and spectroscopic approach (1985)
    Springer
    Chromatographia 20 (1985), S. 582-586 
    Details
    ISSN: 1612-1112
    Keywords: Reversed-phase HPLC ; Ageing processes ; Solid state NMR ; FTIR ; Chain dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Laboratory use of HPLC columns packed with C8 and C18 bonded phases leads to changes in selectivities and retention volumes. FTIR,1H NMR of hydrolysed bonded phases and solid state13C- and29Si NMR were applied to characterize the materials. The results of the various techniques are in fair agreement except solid state NMR. Loss of silane and hydrolysis of surface siloxane groups have been observed for the C8 bondes phase, while for the C18 material the latter process seems to dominate. The solid state NMR results have been tentatively explained in terms of changing chain arrangements and mobilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263215
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of aqueous solutions of thiocyanic acid and their stability (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 117-120 
    Details
    ISSN: 1618-2650
    Keywords: Herstellung von Thiocyansäurelösungen ; Stabilitätsuntersuchungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Various procedures for the preparation of aqueous HNCS solutions have been investigated. Reaction of equimolar amounts of Ba(NCS)2 and H2SO4, and subsequent separation of BaSO4 by centrifugation, yields highly pure (≥ 99%) HNCS solutions. When kept at a temperature of 4° C, 1–2 M solutions are stable for a period of 10–20 days.
    Notes: Zusammenfassung Verschiedene Verfahren zur Herstellung von wäßrigen HNCS-Lösungen wurden untersucht. Hochreine Lösungen (≥ 99%) können durch Reaktion von äquimolaren Mengen Ba(NCS)2 und H2SO4 und anschließende Abtrennung des BaSO4 durch Zentrifugieren hergestellt werden. Bei 4° C sind 1–2 M Lösungen 10–20 Tage lang beständig.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01165814
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  • 5
    Electronic Resource
    Electronic Resource
    Liquid chromatographic trace enrichment with on-line capillary gas chromatography for the determination of organic pollutants in aqueous samples (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 17-24 
    Details
    ISSN: 0935-6304
    Keywords: Coupled LC-GC ; Retention gap ; LC trace enrichment ; Aqueous samples ; Organic pollutants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trace enrichment for the GC analysis of a series of chlorinated pesticides and polychlorinated biphenyls (PCBs) in aqueous samples has been achieved through a simple on-line technique involving sorption on an LC micro-precolumn followed by direct elution into a gas chromatograph with hexane. A 5-m retention gap coupled to the capillary GC column served as the recipient of a relatively large sample volume (ca. 100 μl) introduced into the GC. Partially concurrent solvent evaporation during sample introduction allowed a large sample capacity. Recoveries of more than 95% were observed for the majority of the compounds studied. Using 1.0 ml aqueous samples, detection limits of less than 1 ppt were found. The applicability of the developed method was demonstrated for a river water sample.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240100104
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of polychlorinated biphenyls in sediment by on-line narrow-bore column liquid chromatography/capillary gas chromatography (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 197-202 
    Details
    ISSN: 0935-6304
    Keywords: Coupling LC/GC ; Retention gap ; Polychlorinated biphenyls ; Sediment ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Narrow-bore column liquid chromatography coupled on-line with capillary gas chromatography (LC/GC) is used for the determination of polychlorinated biphenyls (PCBs) in sediment via a heart-cutting technique. This method is compared with a method in which two off-line column clean-up steps are used with subsequent analysis by capillary gas chromatography. For the LC/GC analysis the recovery of PCBs was 90-100%. For two sediment samples from the river Meuse the LC/GC and the other, more laborious method showed good agreement.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110211
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  • 7
    Electronic Resource
    Electronic Resource
    The potential of on-line flame photometric detection in microcolumn liquid chromatography (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 793-796 
    Details
    ISSN: 0935-6304
    Keywords: Microcolumn liquid chromatography ; Flame photometric detection ; Organophosphorus compounds ; On-line preconcentration ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potential of an interface for the on-line coupling of microcolumn liquid chromatography (LC)and a flame photometric detector (FPD) has been further investigated. With the micro-LC/FPD system, relatively high-molecular-weight polar compounds such as cyclic adenosine monophosphate, guanosine monophos- phate, glucose monophosphate, fructose monophosphate, and phytic acid were separated and selectively detected. In order to increase the sensitivity, on-line preconcentration with a microprecolumn inserted in the rotorof a Valcovalve has been applied. Preliminary results have shown that an injection volume of at least 500 1-11 water containing organophosphorus acids at a 5-50 ng/rnl concentration level is possible.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240121206
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  • 8
    Electronic Resource
    Electronic Resource
    Polar solvents for the desorption of a liquid chromatographic precolumn coupled on-line with a capillary gas chromatograph (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 807-812 
    Details
    ISSN: 0935-6304
    Keywords: Polar solvents ; Coupled LC-GC ; Partially concurrent solvent evaporation ; Trace enrichment ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Coupling column liquid chromatography and gas chromatography on-line is becoming more important in analytical chemistry. Especially when large amounts of polar solvents can be introduced into the gas chromatograph without any problem, the technique will offer new possibilities. With a DPTMDS retention gap, evaporation rates and flooded zones of some solvents have been determined. Two modes of operation using partially concurrent solvent evaporation conditions are discussed: (1) injecting a sample via a loop of an LC valve followed by introduction into the gas chromatograph with an LC pump; (2) trace enrichment on a precolumn followed by on-line desorption with n-propanol into the gas chromatograph. Preliminary results for a splitter system, inserted between the retention gap and the analytical column which allows a considerable increase of the evaporation rate are also presented.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240121209
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  • 9
    Electronic Resource
    Electronic Resource
    The extraction of manganese (II) from aqueous thiocyanate solutions with liquid anion-exchangers (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 138-141 
    Details
    ISSN: 1618-2650
    Keywords: Extraktion von Mangan(II) aus Thiocyanatlösung ; flüssiger Ionenaustauscher
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Manganese(II) is efficiently extracted from acidified thiocyanate solutions by alamine and, even more effectively, aliquat dissolved in e.g. toluene or CCl4. The metal-containing species present in the organic extracts is Mn(NCS) 4 2− .
    Notes: Zusammenfassung Mit Hilfe von Alamin oder besser Aliquat, gelöst z.B. in Toluol oder Tetrachlorkohlenstoff, kann Mangan(II) mit gutem Erfolg aus sauren Thiocyanatlösungen extrahiert werden. Mn ist in den organischen Extrakten als Mn(NCS) 4 2− enthalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439855
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  • 10
    Electronic Resource
    Electronic Resource
    Extraction of cobalt(II) from aqueous thiocyanate and chloride solutions with alamine, alamine oxide and tri-n-octylphosphine oxide (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 289 (1978), S. 358-365 
    Details
    ISSN: 1618-2650
    Keywords: Extraktion von Kobalt(II) ; Thiocyanat- und Chloridlösungen mit Alamin, Alaminoxid und TOPO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The extraction of Co(II) from KNCS, HNCS, LiCl and HCl solutions with Alamine 336-S, Alamine oxide and tri-n-octylphosphine oxide has been studied. For acid-deficient systems, the extraction efficiency decreases in the order AlamO 〉 TOPO 〉 Alamine, while the sequence is Alamine 〉 AlamO 〉 TOPO for extraction from acid solutions. Under acid-deficient conditions, extraction invariably proceeds through solvation. On the other hand, in the systems Alamine-HCl and -HNCS as well as AlamO-HCl, extraction is governed by anion-exchange. A mixed extraction mechanism occurs with the AlamO-HNCS, TOPO-HCl and TOPO-HNCS systems. The conclusions reported for liquid-extraction also appear to apply to reversed-phase thin-layer chromatography.
    Notes: Zusammenfassung Die Extraktion von Kobalt(II) aus KNCS-, HNCS-, LiCl- und HCl-Lösungen mit Alamin 336-S, Alaminoxid und Tri-n-octylphosphinoxid wurde untersucht. Im Falle von nichtsauren Systemen nimmt die Extrahierbarkeit in der Reihenfolge AlamO 〉 TOPO 〉 Alamin ab, während für saure Systeme die Reihenfolge Alamin 〉 AlamO 〉 TOPO gilt. Unter nichtsauren Bedingungen erfolgt die Extraktion stets durch Solvatation, wogegen in den Systemen Alamin-HCl, Alamin-HNCS sowie AlamO-HCl Anionenaustausch maßgebend ist. Gemischte Extraktionsmechanismen herrschen in den Systemen AlamO-HNCS, TOPO-HCl und TOPO-HNCS. Die für die flüssig-flüssig-Extraktion beschriebene Schlußfolgerungen scheinen auch für die Umkehrphasen-Dünnschicht-Chromatographie zu gelten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439727
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