Table I. Results of linear combination fitting of Se Kα edge XANES data for cowpea roots exposed to either 20 µm Se[VI] or Se[IV] for 24 h
SampleStandardR Factora
SeO42−SeO32−SeMetSeCysMethylselenocysteine
%
Exposed to Se[VI]74 ± 0.626 ± 0.60.0019
Exposed to Se[IV]71 ± 1.229 ± 1.10.0001
  • a R factor = Σi(experimental fit)2i(experimental)2, where the sums are over the data points in the fitting region.