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  • spectrophotometry  (3)
  • Springer  (3)
  • Elsevier
  • 2005-2009
  • 2000-2004
  • 1990-1994  (3)
  • 1965-1969
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  • Springer  (3)
  • Elsevier
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  • 1
    Electronic Resource
    Electronic Resource
    Four spectrophotometric methods for determination of nitrofurazone in pharmaceutical formulations (1992)
    Springer
    Microchimica acta 108 (1992), S. 185-193 
    Details
    ISSN: 1436-5073
    Keywords: nitrofurazone ; 3-methylbenzothiazolin-2-one hydrazone ; 2-thiobarbituric acid ; isonicotinic acid hydrazide ; metol ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Four simple and sensitive visible spectrophotometric methods (A-D) for the determination of nitrofurazone in bulk samples and pharmaceutical formulations are described. They are based on the formation of colored species by treating either its reduction product with 3-methylbenzothiazolin-2-one hydrazone in the presence of ferric chloride (method A: λmax 600 nm) or its hydrolysis product with thiobarbituric acid (method B: λmax 520 nm, 440 nm) or barbituric acid (method C: λmax 400 nm) or by oxidizing it with excess N-bromosuccinimide and determining the consumed NBS using metol-isonicotinic acid hydrazide (method D: λmax 620 nm).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242428
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  • 2
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of traces of nitrite with rhodamine 6 G (1993)
    Springer
    Microchimica acta 111 (1993), S. 193-198 
    Details
    ISSN: 1436-5073
    Keywords: nitrite determination ; well and sea water ; KNO3 ; NaNO3 ; table salt ; sugar ; milk powder ; spectrophotometry ; rhodamine 6 G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A simple and highly selective spectrophotometric method is described for the determination of nitrite. The method is based on the measurement of decrease in absorbance at 525 nm of rhodamine 6 G in sulphuric acid medium. The decrease in absorbance is instantaneous on addition of nitrite and remains stable for 2 h. Linear calibration graph passing through the origin was obtained in the range 0.01–0.6 μg/ml nitrite. The method is free from interference of Cu2+, Fe3+ and SO 3 2− which normally interfere in other procedures. The method was applied successfully to the determination of nitrite in well and sea water samples and in KNO3, NaNO3, table salt, sugar and milk powder samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245306
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid-liquid extraction and spectrophotometric determination of cadmium with 1,10-phenanthroline and thymol blue (1993)
    Springer
    Microchimica acta 111 (1993), S. 231-237 
    Details
    ISSN: 1436-5073
    Keywords: cadmium determination ; solder ; high purity zinc and indium materials ; spectrophotometry ; 1,10-phenanthroline ; thymol blue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A simple and highly sensitive extraction spectrophotometric method was developed for the determination of traces of cadmium. The method is based on the preconcentrative extraction of ternary-ion-association complex of cadmium—1,10-phenanthroline-thymol blue into chloroform and subsequent determination by spectrophotometry. The ternary ion associate is stable for 20 h and cadmium content as low as 0.1 μg in 90 ml of sample can be determined. The method is precise and has been applied to the determination of cadmium in sea water, solder and high purity zinc and indium materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245311
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