Amberlyst A-26 resin loaded with pyrocatechol violet—Preparation and applications as a preconcentrator in the atomic absorption spectrophotometric determination of lead and cadmium

Abstract

Amberlyst A-26 loaded with pyrocatechol violet has been prepared and used for preconcentrating cadmium and lead before their flame atomic absorption Spectrophotometric determination. The optimum sorption pHs are 7.0–7.8 and 7.0–7.5 for Cd and Pb, respectively. The absorbance varies linearly in the concentration ranges of 0.1–1.0 and 1.5–7.5 μg cm −3, respectively, for the two metals. The sensitivity of the procedure for 1% absorption has been found to be 1.5 and 2.3 ng cm −3 of the solution to be analyzed, respectively, for Cd and Pb. The relative standard deviation is approximately 2.8%. The method has been used to determine Cd and Pb in the water of the Yamuna River (New Delhi, India) with a relative standard deviation between 4.3 and 5.1%.