TABLE 1.

Changes in As redox chemistry made with anaerobic or aerobic incubation of estuarine C. sericea materials^a

Oxyanion and incubation	Change (mM) at:
	3.8 days	5.9 days
Anaerobicb
Arsenate	0.36 ± 0.17	0.19 ± 0.16
Arsenite	0.43 ± 0.23	0.61 ± 0.26
Aerobicc
Arsenate	0.06 ± 0.01	0.27 ± 0.14
Arsenite	0.79 ± 0.02	0.59 ± 0.15

^aMean of three samples ± 1 standard deviation.

^bInitial As(V) added, 0.87 ± 0.03 mM.

^cInitial As(III) added, 0.79 ± 0.06 mM.