Analytical Studies On Precision And Accuracy In Micro determination Of Pb(II), Cd(II),Cr(III)And Hg(II) With Modified Reagent EAB- CTAB
Journal Title: IOSR Journal of Applied Chemistry (IOSR-JAC) - Year 2018, Vol 11, Issue 6
Abstract
Analytical studies have been carried out by forming ternary complex between Eriochrome Azurol B, a Triphenylmethane dye; cationic surfactant Cetyl Trimethyl Ammonium Bromide CTAB; and some heavy metal ions mainly Cd(II), Hg(II) Cr(III)and Pb(II). The absorption spectra of Eriochrome Azurol B ,EAB; a triphenylmethane dye , has been studied in the presence as well as in the absence of cationic surfactant, Cetyl Trimethyl Ammonium Bromide, CTAB . At different pH values ranging from pH 1.00 to 12.00, the spectra is studied. Hypsochromic shift is observed in the absorption spectra in the presence of surfactant. Decrease in the values of dissociation constant, pK values in the presence of surfactant is observed which indicated formation of water soluble, stable, dye-surfactant complex. Composition of stable dye-surfactant complex is determined which is found to be EAB:CTAB as 1:2, and effect of foreign ions such as Chlorides i.e NaCl, KCl, NH4Cl; nitrates i.e KNO3, NaNO3, NH4NO3; and sulphates i.eK2SO4,,Na2SO4 and (NH4)2SO4 has been studied in detail. Bathochromic shift has been observed in the presence of CTAB with metal ions under study. CTAB have shown to increase sensitivity of the color reactions of these complexes with greater solubility and higher stability. The addition of some heavy metal ions such as Cd(II) Hg(II), Cr(III)and Pb(II) to these sensitized modified reagents resulted in the formation of intense, water soluble and stable colored complexes and there is increase in sensitivity in presence of surfactant . Various analytical parameters including rate of color formation, effect of temperature and stability of color formation, range of adherence to Beers Law, Molar Extinction constants, Sensitivity, were studied for all systems in absence as well as in presence of CTAB. Precision and Accuracy of the method suggested for microdetermination of metal ions was determined and found out that method is both precise as well as accurate.
Authors and Affiliations
Dr. Mrs. Suparna Deshmukh
Keywords
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