Table 1.

Isolation yields of ²¹¹At using Te columns in the presence or absence of SnCl₂ in the loading mixture^a.

Loading solution	% Captured by Te column	% Activity in HCl wash (20 mL)	% Activity in H2O wash (20 mL)	%211At eluted in 1st 1 mL NaOH (decay-corrected)
1.5 M HCl	>99.9	<0.1	<0.1	78.9–87.7
0.1 M SnCl2 in 6 M HCl	99.5	<0.1b	<0.1	75

^a35% aqueous NH₂OH⋅HCl was added until the cessation of bubbling. ^bThe Te column was eluted with 20 mL of 0.1 M SnCl₂ in 6 M HCl, followed by 20 mL of 6 M HCl.