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  • 1
    Electronic Resource
    Electronic Resource
    Rapid extractive spectrophotometric determination of hafnium(IV) with 4-(2-pyridylazo)resorcinol (1975)
    s.l. : American Chemical Society
    Analytical chemistry 47 (1975), S. 1692-1693 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60359a042
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  • 2
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of zirconium (IV) with 4-(2-pyridylazo)-resorcinol (1974)
    Springer
    Microchimica acta 62 (1974), S. 797-800 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der orange-rote Komplex des Zirkoniums(IV) mit PAR (1∶1), der sich bei pH 2,5 in Gegenwart von Ascorbinsäure-Phthalatpuffer bildet, wurde zur spektrophotometrischen Bestimmung von Zr bei 540 nm herangezogen. Das Beersche Gesetz gilt zwischen 0,5 und 5,0μg Zr/nl. Die molare Extinktion beträgt 6,75 · 103. Die scheinbare Komplexkonstante (log K) beträgt 5,664±0,2, die Empfindlichkeit entspricht 0,013μg Zr/cm2, die relative Standardabweichung ±1,30%.
    Notes: Summary The orange-red complex formed between zirconium(IV) and 4-(2-pyridylazo)-resorcinol (1∶1) at pH 2.5, in presence of ascorbic acid and phthalate buffer, is used for spectrophotometric determination of zirconium, the absorbance being measured at 540 nm. Beer's law is obeyed for zirconium concentration of 0.5,μg to 5.0μg per ml. Molar absorptivity is 6.75×103. Apparent formation constant (log K) of the complex is 5.664±0.2. The method has sensitivity of 0.013μg of zirconium per cm2 and relative standard deviation ±1.30%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218298
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  • 3
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of hafnium(IV) with 1-(2-pyridylazo)-2-naphthol (1976)
    Springer
    Microchimica acta 66 (1976), S. 585-590 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der rote, bei pH 4,0 sich bildende Komplex mit 1-(2-Pyridylazo)-2-naphthol (1 ∶ 2) dient zur Bestimmung von Hafnium (IV). Seine Extinktion wird bei 545 nm gemessen. Zwischen 0,2 und 3,6μg Hf/ml ist das Beersche Gesetz gültig. Hafnium läßt sich in Gegenwart der sechsfachen Menge Zirkonium bestimmen. Die relative Standardabweichung beträgt ± 1,0%.
    Notes: Summary The red complex formed between hafnium(IV) and 1-(2-pyridylazo)-2-naphthol (1 ∶ 2) at pH 4.0 is used for Spectrophotometric determination of hafnium., the absorbance being measured at 545 nm. Beer's law is obeyed for hafnium concentration of 0.2 to 3.6μg per ml. Molar absorptivity is 3.86×104 and Sandell sensitivity is 0.0046μg per cm2. Hafnium has been determined in the presence of 6-fold amounts of zirconium. The relative standard deviation is ± 1.0%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01220117
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  • 4
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of chromium(III) with 4-(2-thiazolylazo)-resorcinol (1976)
    Springer
    Microchimica acta 66 (1976), S. 579-584 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der 1 ∶ 2-Komplex von Chrom(III) mit 4-(2-Thiazolylazo)resorcin bildet sich bei pH 5,0 und 90° C in 45 min. Er eignet sich zur spektrophotometrischen Chrombestimmung. Die Extinktion wird bei 525 nm gemessen. Das Beersche Gesetz ist zwischen 0,06 und 1,1μg Cr/ml erfüllt. Die molare Extinktion beträgt 4,98 · 104, die Empfindlichkeit nach Sandell 0,0001μg · cm−2. Die Methode wurde zur Chrombestimmung in Stahlproben angewandt.
    Notes: Summary The red complex formed between chromium(III) and 4-(2-thiazolylazo)-resorcinol (1 ∶ 2) at pH 5.0, on heating the reactants to 90° for 45 minutes, is used for Spectrophotometric determination of chromium, the absorbance being measured at 525 nm. Beer's law is obeyed for chromium concentration of 0.06 to 1.1μg per ml. Molar absorptivity is 4.98×104 and Sandell sensitivity 0.001μg cm−2. This method has been applied to the determination of chromium content in steel samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01220116
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  • 5
    Electronic Resource
    Electronic Resource
    Rapid spectrophotometric determination of manganese(II) with 4-(2-thiazolylazo)-resorcinol (1982)
    Springer
    Microchimica acta 78 (1982), S. 247-252 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mangan bildet bei pH 8,8 (Boratpuffer) mit 4-(2-Thiazolylazo)-resorcin ein rotes Chelat, dessen Absorbanz nach 30 sec bei 540 nm in Gegenwart von 20% tert. Butylalkohol gemessen wird. Dieser 1∶2-Komplex entspricht bei einer Mangan-Konzentration von 0,04–1,4μg/ml dem Beerschen Gesetz; seine molare Absorption beträgt 4,176 x 104, die Empfindlichkeit nach Sandell 0,0013μg·cm−2. Die Bildungskonstante (log K) beträgt 9,32, die rel. Standardabweichung ±0,22%. Unter 48 untersuchten Ionen erwiesen sich nur Co(II), Zn(II), Cd(II), Pb(II) und EDTA als störend.-Das Verfahren wurde zur Bestimmung des Mangangehaltes in Stahl verwendet.
    Notes: Summary Manganese forms a red chelate with 4-(2-thiazolylazo)-resorcinol at pH 8.8 (borate buffer), and absorbance is measured after 30 s, at 540 nm in the presence of 20%tert-butyl alcohol (by volume). The 1∶2 complex obeys Beer's law for manganese concentration of 0.04–1.4μg per ml, has molar absorptivity 4.176 x 104 and Sandell sensitivity 0.0013μg cm−2. The formation constant (logK) is found to be 9.32, and relative standard deviation ±0.22%. Of the 48 ions studied for interference, only Co(II), Zn(II), Cd(II), Pb(II) and EDTA2− are found to interfere. This method has been applied for the determination of manganese content in alloy steels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206925
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  • 6
    Electronic Resource
    Electronic Resource
    Amperometric titration of selenite with hypobromite (1958)
    Springer
    Naturwissenschaften 45 (1958), S. 129-129 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640991
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  • 7
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of uranium(VI) with 1-(2′-thiazolylazo)-2-naphthol in the presence of Trition X-100 (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 99 (1986), S. 337-344 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Uranium(VI) reacts with 1-(2′-thiazolylazo)-2-naphthol to form a red-coloured chelate in the pH range 5.3–7.2, maintained by 0.04 M acetate buffer. Absorbance of the sparingly soluble complex, solubilized and stabilized by Triton X-100, is measured after 30 min and it is stable for at least 16 hours. The complex exhibits maximum absorbance at 575 and 625–630 nm, but absorbance at longer wavelengths is not stable. The 1∶2 complex obeys Beer's law over the concentration range 0.4–6.4 μg of uranium(VI) per cm3, has molar absorptivity 3.36·104 dm3·mol−1·cm−1, Sandell sensitivity 7.0 ng·cm−2, formation constant (log K) 9.32 and coefficient of variation ±0.77%. Effect of 60 ions has been studied and selectivity improved considerably in presence of CDTA. The method has been applied for determination of uranium content in a rock sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037594
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  • 8
    Electronic Resource
    Electronic Resource
    Rapid spectrophotometric determination of thorium(IV) with 1-(2′-thiazolylazo)-2-naphthol (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 91 (1985), S. 323-328 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Thorium(IV) reacts with 1-(2′-thiazolylazo)-2-naphthol (TAN) in the presence of antipyrine to form a sparingly soluble red-coloured chelate, soluble in ≥36% methanol (v/v). Complexation takes place instantaneously at pH 2.4–2.8, maintained by glycine buffer. Antipyrine is found to enhance sensitivity of the complex, which is stable for 19 hours. The 1∶2 complex exhibits maximum absorbance at 555 nm, obyes Beer's law in the concentration range from 0.32 to 6.56 μg of thorium(IV) per ml, has a molar absorptivity of 3.14·104 dm3/mol−1·cm−1 and a Sandel sensitivity of 7.4 ng·cm−2. The formation constant (log K) is found to be 8.62 and 8.45. Interference of 57 anions and cations in the determination of thorium(IV) has been studied. From ten repeated determinations, the coefficient of variation was found to be ±0.98%. The method was successfully applied for determination of thorium content in a sample of monazite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061035
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  • 9
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of silver(I) with 4-(2-pyridylazo)-resorcinol (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 272 (1974), S. 44-44 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Silber mit 4-(2-Pyridylazo)-resorcin ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430531
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  • 10
    Electronic Resource
    Electronic Resource
    Photometric determination of mercury(II) with 4-(2-Pyridylazo)-resorcinol (1972)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 260 (1972), S. 289-289 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430288
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