Abstract
A new method for determining lead by resonance Rayleigh scattering (RRS) has been proposed and its operation mechanism has been discussed. In pH 5.0 HAc–NaAc buffer solution, Pb(II) reacted with xylenol orange (XO) to form a chelating anion ([Pb (H2In)] 2–), which further reacted with crystal violet (CV) to form ternary ionic complexes, resulting in the enhancement of RRS intensity. The RRS intensity increases linearly with the concentration of Pb(II) in the range of 2.00 × 10–3–2.00 × 10–2 mg/L under optimal experimental conditions along with the detection limit of 9.2 × 10–5 mg/L. This method is a promising approach for the selective and sensitive determination of Pb(II) in tea.
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