* 1. Removal of insoluble NO from a flue-gas stream can be accomplished by scrubbing with a solution containing Fe(II)EDTA (as in the present experiment). The unavoidable presence of 02 produces the oxidation of Fe(II)EDTA to Fe(III)EDTA, which is unreactive toward NO and thus renders the process useless. Consequently, the reduction of Fe(III)EDTA is a key step toward the success of the global process. To this end, bisulfite can be used as a reducing agent as follows (L symbolizes the EDTA ligand):
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