Application of 3-Hydroxy-3-Phenyl-1 -O-Carboxyphenyl Triazine in the Spectrophotometric Determination of Lead (II)

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The colour reaction between lead (II) with 3-hydroxy-3-phenyl-1-o-carboxyphenyltriazine at 20-40°C in hexamine buffer (pH 7.1-7.6) results in the formation of a stable dark green yellow complex. The [Pb(ll) : R] reagent ratio in this complex is 1:1 with absorption maximum at 401 nm. The molar absorptivity and Sandell's sensitivity values of the complex are 9000 l/mole cm and 23.021 ng/cm2 respectively at the working wavelength 407 nm. The Beer's law is valid over the concentration range 0.2x10-4 M cf lead (II). The standard deviation of the method for the determination of 8.28 ppm of lead (II) ± 0.047 ppm (0.57%). The interference studies with 22 cations and anions have also been performed.

hexamine; absorptivity; carboxyphenyltriazine