A Novel and Highly Sensitive Catalytic Method for the Determination of Ultra Trace Amounts of Cerium with Spectrophotometric Detection

Authors: M Hashem, AA Ensafi

Publication date: 1996/9/22

Journal name: Journal of Sciences, Islamic Republic of Iran

Volume: 7

Abstract Cerium (IV) has a catalytic effect on the very slow redox reaction between
gallocyanine and bromate in acidic media. The reaction was monitored
spectrophotometrically at 525 nm by a fixed time method of 4.0 min from initiation of the
reaction. The decrease in absorbance at 525 nm is proportional to the Ce (IV) concentration
in the range of 0.005-1.000 and l. 00-10.00 pg. ml". The limit of detection is 2.0 ng. ml". The
relative standard deviation for ten replicate analyses of 0. 100|. tg. ml" is 1.5%. The ...