An-Najah Blogs :: An-Najah Blogs :: en-us Sat, 23 Sep 2017 10:32:59 IDT Sat, 23 Sep 2017 10:32:59 IDT Sensitive spectrophotometric determination of La(III) with 1-(2-pyridylazo)-2-naphthol ArticlesA simple and sensitive method for spectrophotometric determination of lanthanum has been developed At pH 96 in presence of 50 ethanol lanthanum reacts with 1--2-pyridylazo-2-naphthol PAN to form a red complex which has two absorption maxima at 545 and 510 nm The molar absorptivity at 545 nm is 055 104 liters mol1 cm1 On the other hand lanthanum reacts with PAN in pure ethanol to form a red complex at 530 nm with high molar absorptivity 8 104 liters mol1 cm1 Microchemical Journal Volume 30 Issue 2 October 1984 Pages 231-234