Measured humic acid in water by the potassium permanganate oxidation flow-injection chemiluminescence
When potassium permanganate oxidized humic acid, it has been discovered that they happened chemiluminescence reaction. Kinetic curve of system of KMnO<sub>4</sub>-humic acid is mapped and the reactions' conditions are optimized. Meanwhile, a new method of chemiluminescence analysis of determination of humic acid in natural water, and linear range of the method is 1×10<sup>-1</sup>~1×10<sup>2</sup>mg/L (R=0.9989) and the detection limit is 8×10<sup>-8</sup>g/ml. Doing parallel determination eleven times at the concentration of 20mg/L humic acid, finds that the relative standard deviation of RSD is 2.98%.