Design electronic board to delermine COD in water by UV absorption spectrum

Abstract

     System of electric main is designed to response the matematic expression of the optical absorbant according to the Lambeer - Beer law by the transfer light through the solution (Tx) of sources light 254nm UV(I0). The optical absorbant depends on the property solution transfered. The paper  presents the results of the study on system of electric main, which was designed for quickly measurement COD using spectrometric methods by ultraviolet wavelength  UV- 254nm.The specific optical absorbant can be between 10-1 to 10-4.The concentration conversion koeficient K can be 10.000mg/L. The COD concentration of waster water can be 20.000mg/L. Time respond of measuring result are 2-3 minutes. The average value  of 10-20 measured numbers have been calculated. Thes specified invalid of COD determination about 10%. The repeats of measuring is 95%. The erroneous of four UV-COD devices is less than  6% for measuring parallel. Systems device is designed for COD measurement continuous and transmits the measuring signals online in maximum distance 1.3km, appropriate for environmental monitoring continuous and online in the industrial zones in Việt nam.