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  • 1
    Electronic Resource
    Electronic Resource
    Regular solution theory in model interpretation of the analyte losses during preatomization sample treatment in the presence of chemical modifiers in electrothermal atomization atomic absorption spectrometry (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 2596-2603 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00045a022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rapid determination of nitrate nitrogen in soils
    Amsterdam : Elsevier
    Talanta 24 (1977), S. 199-200 
    Details
    ISSN: 0039-9140
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-9140(77)80094-5
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The role of the visual image in analytical chemistry
    Amsterdam : Elsevier
    TrAC Trends in Analytical Chemistry 1 (1982), S. xiii 
    Details
    ISSN: 0165-9936
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-9936(82)80117-9
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  • 4
    Electronic Resource
    Electronic Resource
    Environmetrical Treatment of Water Quality Survey Data from Yantra River, Bulgaria (2000)
    Springer
    Microchimica acta 134 (2000), S. 15-21 
    Details
    ISSN: 1436-5073
    Keywords: Key words: River water; chemical analysis; data treatment; environmetrics; multivariate statistics; cluster analysis; principal components analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract.  The environmetrical analysis carried out has indicated that the short-term water quality survey may give a very important information on the latent factors influencing the water quality of Yantra river basin. The principal components analysis carried out reveals that at least four principal components are necessary for multivariate statistical modeling of the water quality – combination of natural and anthropogenic influences (“mixed” factor) reflecting parameters such as water hardness, marine influence, organic pollution; typical anthropogenic influences (“anthropogenic” factor) explaining the metal contamination of the river water; everyday wastes, usually N-containing pollutants such as nitrates, nitrites or ammonia, form the “N-containing wastes” factor and a “temperature” factor formed by typical physical parameters such as water and air temperature. The formation of these special features of the river waters from Yantra basin is also confirmed by the results of cluster analysis (variable clustering) where the content of the significant clusters of the variables is the same as the content of the principal components modeling over 75% of the total variance of the system. Additionally, the cluster analysis of the objects has proved that the water quality during both sampling traverses is very stable and reproducible. Few exceptions are observed due to momentary local pollution in an industrial area along the river stream. Comparison with standard requirements for water quality has indicated that the Yantra river waters are of high quality and could be used after minor pretreatment as potable water sources. The environmetrical approaches applied reveal a specific information concerning the river water quality. In this way the ecological problem treated has not a local importance but suggests a strategy for estimation of similar ecosystems in global sense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006040070047
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental factors estimation in nephelometric procedures (1985)
    Springer
    Microchimica acta 87 (1985), S. 385-392 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Experimental Factors Estimation in Nephelometric Procedures The nephelometric determinations of low concentrations of sulphate ions are usually influenced by a variety of experimental factors such as presence of stabilizing agents, acids, interferences, equilibration and stirring time etc. The present study makes an attempt to estimate the weight of 6 input factors at different levels of sulphate concentrations by the use of the economic experimental design known as random balance method. It is found that some of the input factors (presence of stabilizing media, acidity) are of higher rank than others (equilibration time or barium ions concentration). Using these results it is easy to find optimal conditions for micro-determination of sulphates by nephelometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196838
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  • 6
    Electronic Resource
    Electronic Resource
    A comparative study on the nitrate determination in airborne dust (1977)
    Springer
    Microchimica acta 68 (1977), S. 397-403 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur Bestimmung von Nitrat in Staubproben wurden die UV-Spektrophotometrie und die Direkt-Potentiometrie mit ionenselektiven Elektroden verglichen. Die Untersuchung erfolgte an standardisierten Staubproben und an Proben, die mit High Volume Filter Samplern (Sartorius) und mit Kaskadenimpaktoren gesammelt worden waren. Die Direktpotentiometrie konnte bei alien mit verschiedenen Methoden gesammelten Stauben erfolgreich mit einem Standardadditionsverfahren eingeScizt werden. Die UV-spektrophotometrische Methode konnte bei den Impaktorproben nicht eingeScizt werden, da die Sammlung auf Kupferfolien erfolgte und Kupfer die Bestimmung stört. Der Vorteil der UV-Spektrophotometrie liegt in der Bestimmung sehr kleiner Nitratmengen (bis 0,25μg/ml). Der Vorteil der ionenselektiven Elektroden liegt hingegen in der einfachen analytischen Vorgangsweise bei Proben bis zu 1 ppm Nitrat.
    Notes: Summary Two analytical methods for determination of nitrate in airborne dust samples — spectrophotometry and direct potentiometry with ionselective electrodes — are compared. Different aerosol samples collected by an impaction cascade device and a high-volume filter sampler and model “powdered” dust samples were analysed. It was shown that direct potentiometry is quite satisfactory for nitrate determination irrespective of collecting technique if the known addiMikrochim. Acta 1977 II-6 tion procedure is used. The spectrophotometric determination of impaction-collected aerosol samples suffers from interference by the copper foil used for collection. The advantage of the spectrophotometric method is that concentrations as low as 0.25μg/ml can be determined reliably. The advantage of potentiometry is that it gives a simple analytical technique for samples containing down to 1 ppm NO3 − and it can readily be automated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196225
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  • 7
    Electronic Resource
    Electronic Resource
    Potentiometric determination of chloride and bromide in airborne dust (1977)
    Springer
    Microchimica acta 68 (1977), S. 325-330 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Anwendung eines einfachen, schnellen und reproduzierbaren potentiometrischen Verfahrens zur Bestimmung von Bromiden und Chloriden in Stauben wurde beschrieben. Der Einsatz einer Motorkolbenbürette für die relativpotentiometrische Titration und die Verwendung eines Differentiators erlauben eine exakte Bestimmung des Titrationsendpunktes und ermöglichen so das gute Auflösungsvermögen des Verfahrens. Die Methode wurde routinemäßig in der Umweltanalytik eingesetzt.
    Notes: Summary A simple, rapid and reproducible potentiometric titration method for determination of both bromide and chloride in airborne dust is described. The use of a precise microburette and a differentiating recorder allows good resolution of the two species determined. The method can be easily applied for routine environmental control analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196216
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Multivariate statistical analysis of coastal sediment data (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 489-493 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Multivariate statistical analysis of sediment data (information matrix 123 × 16) from the Gulf of Mexico, USA shows that the data structure is defined by four latent factors conditionally called “inorganic natural”, “inorganic anthropogenic”, “bioorganic” and “organic anthropogenic” explaining 39.24%, 23.17%, 10.77% and 10.67% of the total variance of the data system, respectively. The receptor model obtained by the application of the PCR approach makes it possible to apportion the contribution of each chemical component for the latent factor formation. A separation of the contribution of each chemical parameter is achieved within the frames of “natural” and “anthropogenic” origin of the respective heavy metal or organic matter to the sediment formation process. This is a new approach as compared to the traditional “one dimensional” search with a limited number of preliminary selected tracer components. The model suggested divides natural from anthropogenic influences and allows in this way each participant in the sediment formation process to be used as marker of either natural or anthropogenic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051510
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  • 9
    Electronic Resource
    Electronic Resource
    Microdetermination of nitrate nitrogen in lake waters by potentiometry with an ion-selective electrode (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 297 (1979), S. 418-418 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Nitrat in Wasser ; Potentiometrie/Elektroden, ionenselektive ; Seewasser, Methodenvergleich
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00480902
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of different instrumental and chemical parameters in analytical determinations by the use of experimental design methods (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 194-197 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The paper deals with the application of fractional experimental design, random balance method and full experimental design with two levels of variation of the input parameters for the estimation of the significance of chemical and instrumental factors in different analytical problems. The example chosen refer to the fluorimetric determination of aluminium (estimation of three chemical and two instrumental factors for optimization purposes), the ranging of environmental factors in the determination of the protective ability of polymer coatings (seven parameters are included) and the determination of several anions in aerosol samples by ion chromatography (the significance of three operational parameters for model solutions is considered). It is shown that the experimental design strategies can be used as reliable and quick tools for ranging and parameter estimation.
    Notes: Zusammenfassung Die Anwendung der Fraktions-Experimentalplanung, des Zufallsausgleichs und der Vollplanung auf zwei Ebenen der Eingangsparameter zur Bewertung der Wichtigkeit von instrumentellen und chemischen Parametern bei verschiedenen analytischen Aufgaben wird diskutiert. Die gezeigten Beispiele beziehen sich auf die fluorimetrische Bestimmung von Aluminium (Bewertung von drei chemischen und zwei instrumentellen Faktoren für Optimierungszwecke), die Einordnung von Umweltfaktoren bei der Bestimmung der Schutzwirkung von Polymerschichten (sieben Parameter), und die Bestimmung einiger Anionen in Aerosolproben mit der Ionen-Chromatografie (dabei wird die Wichtigkeit von drei Arbeitsparametern bei Modellösungen betrachtet). Es wird gezeigt, daß diese Planungsstrategie zur zuverlässigen und schnellen Bewertung und Einordnung von Parametern geeignet ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00517658
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