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Fig. 3. Effects of initial sorption period on desorption of Y from four investigated soils. ({square}) Yingtan soil, 1 wk; ({blacksquare}) Yingtan soil, 20 wk; ({triangleup}) Tongjiang soil, 1 wk; ({blacktriangleup}) Tongjiang soil, 20 wk; ({diamond}) Beijing soil, 1 wk; ({diamondsuit}) Beijing soil, 20 wk; ({circ}) Haerbin soil, 1 wk; (•) Haerbin soil, 20 wk.