Abstract
ABSTRACT Nitrite was reduced in acidic potassium iodide solution to produce nitrogen oxide which was measured amperometrically by a modified gold electrode covered with a PTFE-membrane as the permeability barrier for interfering substances in the sample. The calibration curve was linear up to 30 μM of nitrite and 10 samples could be determined per hour. The average current and the standard deviation for 10 μM standard solution (N=10) were 1.51 x 10-2 μA and 6.4 x 10-5 μA (RSD=0.42 %), respectively. The detection limit was 0.25 μM. No response was observed for electrochemical interferant substances such as ascorbic acid and FeSO4. The reducing reagent could be reused. Recovery tests were satisfactory (101-103%). The results obtained with this sensor and with the diazotization method for a fish culture water agreed within 8.6%.
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