Abstract

KONDO, Márcia M.; ARCOS, Maria A. S. V.  and  GRASSI, Marco T.. Dissolved Organic Carbon Determination Using FIA and Photo-Fenton Reaction. Braz. arch. biol. technol. [online]. 2002, vol.45, n.1, pp. 81-87. ISSN 1516-8913.  http://dx.doi.org/10.1590/S1516-89132002000100013.

The FIA-photo-Fenton system is based on the flow oxidation of the organic matter. A small amount of the sample containing H₂O₂ is injected into the acidic flow solution of Fe²⁺, which passes through a tubular PTFE reactor irradiated with UV light. The generated CO₂ is quantified by a conductometric detector and is directly proportional to the dissolved organic carbon concentration in the sample. The optimization studies were performed using EDTA solutions. The average recovery of organic carbon was 83% with a relative standard deviation of 3.7% using a 1:5 molar ratio of Fe²⁺:H₂O₂, pH 2.0, 100 mL of sample injection and a liquid flow of 1 mL min^-1. After optimization, the DOC concentration was quantified using 13 different organic compounds, where the average recovery was 90%. The rate of the analysis was in average 50 samples hour^-1.

Keywords : Photo-Fenton reaction; dissolved organic carbon; FIA.