Abstract
A very simple ultra-sensitive and selective quenchofluorimetric method for the determination of Pd(II) is described. The method is based on the quenching action by Pd(II) upon the native fluorescence of bathophenanthroline (4,7-diphenyl-1,10-phenanthroline) solution (λex (max)=291 nm; λem (max)= 451 nm) in the optimum acidity range 0.025 M–0.20 M H2SO4 at room temperature (25±5 °C). The fluorescence quenching is collinear in the range of 1–400 μg L−1 palladium(II). The developed method is very precise and accurate [S.D.=±1.2 μg L−1 Pd(II) and R.S.D.=2.5% for 11 replicate determinations of 50 μg L−1 Pd(II)]. Over fifty inorganic ions, including platinum group metals and common complexing agents do not interfere. It is a one-step process that requires no extra clean up. The developed method has been successfully tested for synthetic mixtures of various base metals and platinum group metals, synthetic mixtures corresponding to osmiridium ore, Certified Reference Materials in spiked conditions and rock samples.
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