Formation of Polychlorinated Dibenzo-p-Dioxins/Dibenzofurans from Residual Carbon on Municipal Solid Waste Incinerator Fly Ash Using Na super(37)Cl

Radiolabeled sodium chloride was used to follow the formation of PCDDs and PCDFs from residual carbon on municipal solid-waste incinerator flyash. Addition of the radiolabeled salt allowed measurement of the competition between the various Cl sources. The reaction mixtures consisted of flyash or aqueous-extracted flyash and glass beads. The additions included natural NaCl, radiolabeled NaCl, and/or copper chloride. Results showed that radiolabeled NaCl was a relatively poor Cl source. The direct transfer of super(37)Cl from CuCl sub(2) to C and PCDD/F appeared to be much faster than the transfer from Na super(37)Cl via a metal chloride. The exchange of Cl between Cu and C was fast relative to that between Na and Cu. The data suggested that native Cl remaining in the flyash and Cl in residual C could be incorporated into PCDD/F.