Environmental Engineering Reference
In-Depth Information
Np4f 7/2
Np4f 5/2
2.0
2.0
1.99
1.99
430
420
410
Energy (eV)
400
390
430
420
410
Energy (eV)
400
390
Figure 29.7 Np 4f electron spectra taken for ternary Np-cHP-HQ100 goethite system: left - pH = 3.5, right - pH = 7.5, I(NaclO 4 ) = 0.1 m,
c(Np(V)) T = 5.8⋅10 −7 m, c(α-FeOOH) = 0.22 g/l, c(cHP-HQ100) = 44 mg/l.
2 microns
2 microns
2 microns
2 microns
2 microns
2 microns
Figure 29.8 The STxm c1s ratio image analysis of the goethite sample equilibrated with cHP-HQ100 at pH 3.5. upper row (from left
to right): absorption image at 280 eV below the c1s edge; ratio images showing the distribution of aromatics, phenol-type groups and lower
row aliphatics, carboxyl-type groups and total organics. Bright gray values indicate high concentrations of organic functionality.
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