TABLE 1.

Mn(IV) and Fe(III) reduction during oxidation of [1,2-¹⁴C]DCE in intermediate aquifer microcosms^a

Microcosm	Amt (nmol) of productb
	Mn(II)		Fe(II)
	Exptl	Control	Exptl	Control
Anaerobic	9 ± 1	1	NS	NS
Fe(OH)3 amended	NS	NS	35 ± 11	3
MnO2 amended	47 ± 6	NS	NS	NS
Aerobic	NS	NS	NS	NS

^aMicrocosms were vortex mixed and 1.0 ml of sediment supernatant was removed, filtered (0.2-μm pore size), and analyzed colorimetrically with commercially available test kits (Hach Chemical Co.). 

^bThe amount of Mn(II) or Fe(II) produced is presented as a qualitative indicator of Mn(IV) or Fe(III) reduction because the Mn(II) or Fe(II) found in the dissolved phase is a small fraction (less than 10%) (14) of the total Mn(II) or Fe(II) present in the system. Experimental data are means ± standard deviations from duplicate microcosms, and control data are from a single sterile control. NS, no significant change.