H-point Standard Addition Method for Determination of Cadmium and Mercury

Abstract

H-point standard addition method (HPSAM) has been applied for simultaneous determination of
Cd(II) and Hg(II) using 1-(2-pyridylazo)-2-naphthol (PAN) as a chromogenic reagent in aqueous
Triton X-100 micellar media at pH 10.0. Cd(II) and Hg(II) can be determined simultaneously in the
concentration range 0.112-1.405 µg mL-1 and 0.201-2.507 µg mL-1 respectively. The proposed method
has successfully been applied for simultaneous determination of Cd(II) and Hg(II) in synthetic
samples, spiked water samples, tobacco, tomato, spinach and powdered milk.