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DPD TRO sensor for measuring high concentration range (above 10 mg/L) of total residual oxidant which is an index for disinfection and neutralization in ballast water has been constructed. The results of absorbance test using RGB sensor show two times higher separated performance in high concentration of TRO at 460~480 nm wavelengths (blue ray zone) than 510~520 nm wavelengths (green ray zone) which is used in existing DPD sensor. As a result of reagent porformance test in order to apply in ballast treatment system, the mixing ratio of buffer reagents (Ethylene diamine tetra acetic acid, potassion iodide, (Tri)sodium Citrate Salt) which is 5 : 30 : 65 is the best mixing combination of DPD reagents in accordance with the public announcement on the type approval and precision test of the environmental measuring devices.

Feasibility Study on DPD TRO Sensing System for Measuring High Range of Total Resiudual Oxidant in Ballast Water