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Abstract

DETERMINATION OF MERCURY (II) BY SPECTROPHOTOMETRIC AND FLOW INJECTION TECHNIQUES USING NEW REAGENT 2-(4- BROMO-2, 6-DIMETHYL PHENYL) AZO 4, 5-DIPHENYL -1- IMIDAZOL)

Abid Allah Mohammed Ali, Khdeeja Jabbar Ali and *Haider Norri Raheem

ABSTRACT

Mercury (Hg) is very toxic element; therefore, accurate detection of such dangerous elements is of paramount importance. This research includes preparation of new organic reagent 2-(4-bromo-2, 6- dimethyl phenyl) azo 4, 5-diphenyl -1- imidazol) and its identification by UVVisible spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy and then use of this reagent for determination of mercury ions. The reagent was prepared and the absorbance spectrum was generated for the reagent as well as its mercury complex. The comparison of two spectrums depicted the differences between two spectrums and maximum absorbance was observed at 504nm for mercury complex. The optimum absorbance was recorded at pH 7, with reagent concentration of 10-4 M. The complex was observed to be stable at various temperatures (5-70 0C) and for a longer period of time (1440min). The stoichiometry of complex was determined by two methods (mole ratio and Job method) and found to be (2:1) (reagent: ion). The interference of foreign ions was studied and suitable masking agent for each ion was recorded. The new reagent was used for determination of mercury ion in a new design of flow injection system (FIA). Various parameters (physical and chemical) affecting the determination have been investigated. The ideal parameters were found to be pH 7, flow rate 14.5 ml/min, reaction coil length 50cm, volume of reagent 235μl and volume of sample 117.μl. For FIA system, the average dispersion coefficient was found to be 1.117. The results obtained in this study showed that the new reagent can be employed for accurate determination of mercury ion.

Keywords: Mercury ion, Flow injection, FTIR, Spectroscopy.


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