It has been found that there are many unknown genotoxic compounds in flue gas, and some of them are expected to be semi- and nonvolatile organohalogen compounds. The measuring method of the semi- and nonvolatile organic halogen (SNVOX) as a new hazardous index was developed for controlling and monitoring of flue gas from various facilities, and the correlations among the concentrations of SNVOX and PCDDs/PCDFs or Cl_(4-6)BZs were examined. The easy procedures and the conditions for the sampling, the extraction, the evaporation, and the concentration were determined for measuring SNVOX, which means organohalogen compounds having higher boiling points than ca. 240℃. A correlation of I-TEQ values of PCDDs/PCDFs and the concentration of SNVOX was found, and I-TEQ could be estimated approximately from SNVOX. It was found that the Cl_(4-6)BZs were one of main semi- and nonvolatile organohalogen compounds in the flue gas, but SNVOX contains many other organohalogen compounds including unknown compounds, and some of them may have toxicity.
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