Fig. 1 (a) Breakthrough curves (BTCs) of the four different tracers for the column D1. (b) The BTCs adjusted so that t = 0 when each tracer was first applied to the column D1
Fig. 1 (a) Breakthrough curves (BTCs) of the four different tracers for the column D1. (b) The BTCs adjusted so that t = 0 when each tracer was first applied to the column D1