of a masking agent into
a 0.1 mL of sample solution (10–1000 lM) followed by 0.1 mL of
cyanidin solution. In case of Cu(II), Pb(II), Fe(III) and Al(III) detection,
buffer pH 7, pH 6, pH 4 and pH 5, respectively were used.
Masking agents, KF, DMG and the mixture of KF and DMG was used
for Fe(III), Al(III) and Pb(II) detection, respectively.