TABLE 6. Iodide and iodate K_d values after 21 days of composite sediments recovered from 200 West Area borehole cores (Santschi et al., 2012).

Composite sedimenta	Organic carbon (%)	Inorganic carbon (%)	Total sediment iodine (μg/g)	Total DOC (μM)b	Iodide, spiked Kd (mL/g)c	Iodate spiked Kd (mL/g)c
H3	0.15	0.18	2.10	94 ± 17	3.38	3.94
H1	0.12	0.92	4.79	284 ± 33	0.08	1.78
H2	0.04	0.01	0.68	0	0.00	0.83

^a Sediment 1: composite of fine-grained sediments, mostly silt, from the vadose zone of borehole cores 299-W11–92 and 299-W15–226. Natural calcium carbonate cementation of the sediment was apparent. Sediment 2: composite from different depths within one well (299-W11–92). Sediment 3: composite of saturated zone sediments of two different wells: 299-W11–92 and 299-W15–226.^bTotal dissolved organic carbon is the total organic carbon released from the sediment to the aqueous phase (<0.45 μm) after 21 days of contact during the sediment/groundwater batch iodine uptake experiment.^cSuspensions were spiked with either iodide or iodate but during contact period the spiked species transformed to other species. Consequently these are not species-specific K_d values.