[Determination of trace manganese by catalytic kinetic spectrophotometry method with CTMAB as the sensitizer].

A new catalytic spectrophotometric method for the determination of trace amount of Mn(II) was developed. The method is based on the oxidation of 7-(2-nitryl-4-methyl phenylazo)-8-hydroxy-qinolin-5-slfonic acid by potassium periodate in the presence of nitrilo triacec acid as an activator and CTMAB as a sensitizer. The wavelengths for the determination was 509 nm. The linear range of determination is 0-3. 2 x 10(-9) g x mL(-1) for Mn(II). The determination limit is 3.8 x 10(-11) g x mL(-1). The interference of foreign ions was studied. The method can be used for the determination of Mn(II) in mung bean, rice, cereal and soil samples.