Flow-injection spectrophotometry of manganese by catalysis of the periodate oxidation of 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid).
A sensitive flow-injection spectrophotometric procedure is proposed for the determination of manganese(II), based on its catalytic effect on the oxidation of 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) with periodate. By monitoring the change in absorbance of the oxidation product of ABTS at 415 nm, manganese(II) in the range 0.05-1.0 ng ml(-1) can be determined with a sampling frequency of 30 h(-1). A relative standard deviation (R.S.D.) (n=10) is 1.6% at the 0.5 ng ml(-1) level. The proposed method suffers from few interferences and has been successfully applied to the determination of manganese in river, lake and seashore water samples.
Nakano
S
S
Chemical Institute, Faculty of Education, Tottori University, Koyama-cho, Tottori 680-0945, Japan.
Tanaka
K
K
Oki
R
R
Kawashima
T
T