Analytical Sciences

Monitoring of Hydrogen Peroxide, Nitrate and Nitritein Rain Water

Tetsuyuki TANIAI, Akio SAKURAGAWA, and Tadao OKUTANI

Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda-Surugadai, Chiyoda, Tokyo, 101-8308, Japan

The relationship between hydrogen peroxide and nitrate and nitrite by monitoring these substances in rain water was investigated. For the determination of hydrogen peroxide, our previously reported FIA system was applied. For the determination of nitrate and nitrite, an FIA system consisting a copperized cadmium reduction column and 2,3-diaminonaphthalene (DAN) used as fluorescence substance was developed. Under the recommended conditions, it took 8min to determine the sum of nitrate and nitrite while passing through the copperized cadmium reduction column; it took 6 min under the same condition to determine nitrite without passing through the column. The concentration of nitrate wascalculated from the difference between the sum of nitrate and nitrite and nitrite. The detection limit, which was defined by a signal-to-noise ratio of 3, was calculated to be 0.1 umol dm^-3 for nitrite. Also, the relative standard deviation at 20 umol dm^-3 of nitrate was under 1.0% (n = 10). There was no interference from the major substances present in rain. The reaction scheme was based on the monitoring results.

J-STAGE: View this article in J-STAGE