TABLE 1.

Summary of XPS data obtained from precipitates formed by reduction of Cr(VI) by resting cell cultures of a Halomonas species from Mono Lake

Starting pH	XPS elemental composition (atomic %)								XPS valence state [Cr(III)/Cr(VI)]
	C	O	Cr	Na	Si	Ca	N	P
10	67.8	20.3	0.4	0.4	5.4	0.2	6.0	0.3	100:0
11	73.0	21.7	0.6	0.2	3.3	0.5	0.8		74:26