Simultaneous spectrophotometric determination of nitrite and nitrate by flow injection analysis

Authors: Ali Asghar ENSAFI, Behzad REZAEI, Siyavah NOUROOZI

Publication date: 2004

Journal name: Analytical sciences

Volume: 20

Pages: 1749-1753

Publisher: 社団法人日本分析化学会

A new catalytic spectrophotometric method is reported for the simultaneous determination of
nitrite and nitrate by flow injection analysis, based on the catalytic effect of nitrite on the
redox reaction between pyrogallolsulfonephthalein and potassium bromate in acidic media.
Nitrate can also be on-line reduced to nitrite with a modified copper-coated cadmium
reduction column. The reaction was monitored spectrophotometrically by measuring the
decrease in the absorbance of pyrogallolsulfonephthalein at 465 nm. Various analytical ...