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Complex equilibria and spectrophotometric determination of mercury(II) with Lawsone

Komplex-Gleichgewichte und spektrophotometrische Bestimmung von Quecksilber(II) mit Lawson

  • Anorganische Und Physikalische Chemie
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Summary

The complex equilibria of mercury(II) with Lawsone [2-hydroxy-1,4-naphthoquinone,LAS] were studied spectrophotometrically in 40% (ν/ν) ethanol water at 20°C and an ionic strength of 0.1M (NaClO4). A complete picture of the solution equilibria in thepH range 0.6–4.0 is presented. The complexation reactions were demonstrated and characterized using graphical logarithmic analysis of the absorbance graphs. A simple, rapid, selective, and sensitive method for the spectrophotometric determination of trace amounts of mercury is developed based on the formation of the orange-red Hg(LAS)2 complex atpH 2.7. The effect of interferences was studied. The method has been applied to the determination of traces of mercury in different matrices and some organomercury compounds.

Zusammenfassung

Die Komplex-Gleichgewichte von Quecksilber(II) mit Lawson (2-Hydroxy-1,4-naphthochinon,LAS) wurden spektrophotometrisch in 40% (ν/ν) Ethanol/Wasser bei 20°C und einer Ionenstärke von 0.1M (NaClO4) untersucht. Es wird ein umfassendes Bild der Gleichgewichte impH-Bereich von 0.6–4.0 gegeben. Die Komplexierungsreaktionen werden mittels graphischer, logarithmischer Analyse der Absorptions-Graphen charakterisiert. Es wird eine einfache, schnelle, selektive und empfindliche Methode für die spektrophotometrische Bestimmung von Quecksilber als Spurenbestandteil mittels der Bildung des orangeroten Hg(LAS)2-Komplexes beipH 2.7 entwickelt. Interferenzen mit anderen Ionen wurden untersucht. Die Methode wurde für die Bestimmung von Quecksilberspuren in verschiedenen Materialien und einigen Organoquecksilberverbindungen verwendet.

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Abbreviations

C L :

Total concentration of the ligand.

C M :

Total concentration of the metal ion.

ΔA=A−A L :

Differences in the overall absorbance and the absorbance of the reagent blank under the same conditions

\(\varepsilon _{LH_x } \) and\(\varepsilon _{LH_{x - 1} } \) :

Molar absorptivities of theLH x andLH x−1 species of the reagent

ε1H, ε1 and ε2 :

Molar absorptivities of HgLH2+, HgL + and HgL 2 complexes

q :

Number of protons released during complexation

*K 11, *K 12, *K kal, *K 22,k andk′:

Equilibrium constants according to reactions: A, B, C, D, E, and F, respectively

K a1 :

Proton dissociation constant (LH +2 /LH) of the reagent

K a2 :

Proton dissociation constant (LH/L −) of the reagent

References

  1. Sandell E. B. (1965) Colorimetric Determination of Traces of Metals, 3rd edn. Interscience, New York, p. 621

    Google Scholar 

  2. Imai H. (1969) Nippon Kagaku Zasshi (J. Chem. Soc. Japan, Pure Chem. Sect.)90: 275

    Google Scholar 

  3. Komatsu S., Nomura T. (1967) Nippon Kagaku Zasshi (J. Chem. Soc. Japan, Pure Chem. Sect.)88: 542

    Google Scholar 

  4. Komatsu S., Nomura T. (1967) Nippon Kagaku Zasshi (J. Chem. Soc. Japan, Pure Chem. Sect.)88: 1124

    Google Scholar 

  5. Seleim M. M., Idriss K. A., Saleh M. S., Sedaira H. (1987) Analyst112: 1685

    Google Scholar 

  6. Cacho J., Nerin C. (1981) Anal. Chim. Acta131: 271

    Google Scholar 

  7. Fernandez T. L. P., Hornillos R. I., Martin A. C., Andrea R. G. (1983) Talanta30 (3): 179

    Google Scholar 

  8. Petez-Ruiz T., Ortuno J. A., Torrecillas M. C. (1984) Anal. Chim. Acta165: 275

    Google Scholar 

  9. Rosales D., Ariza J. L. G. (1985) Anal. Chem.57: 1411

    Google Scholar 

  10. Medinilla J., Ales F., Sanchez F. G. (1986) Talanta33 (4): 329

    Google Scholar 

  11. Capitan F., Espinosa P., S. Bosque-Sendra J. M., Molina F. (1987) Annali di Chimica77: 945

    Google Scholar 

  12. Sharma R. L., Singh H. B. (1989) Talanta36 (4): 547

    Google Scholar 

  13. Douheret G. (1968) Bull. Soc. Chim. Fr.: 3122

  14. Kuban V., Havel J. (1973) Acta Chem. Scand.27: 528

    Google Scholar 

  15. Sommer L., Kuban V., Havel J. (1970) Folia Fac. Sci. Nat. Univ. J. E. Purkyne Brno, Chemia11 (7): part 1

  16. Job P. (1928) Ann. Chim. (Paris)9: 113

    Google Scholar 

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, University of Assiut, Assiut, Egypt

    Magda S. Saleh, Kamal A. Idriss, Hassan Sedaira & Sherif K. Idriss

  2. Central Laboratory, Faculty of Science, University of Assiut, Egypt

    Sherif K. Idriss

Authors
  1. Magda S. Saleh
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  2. Kamal A. Idriss
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  3. Hassan Sedaira
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  4. Sherif K. Idriss
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Additional information

Z=1+K a2/[H].

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Saleh, M.S., Idriss, K.A., Sedaira, H. et al. Complex equilibria and spectrophotometric determination of mercury(II) with Lawsone. Monatsh Chem 121, 481–492 (1990). https://doi.org/10.1007/BF00810855

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  • DOI: https://doi.org/10.1007/BF00810855

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