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. 2020 Jan 16;7:100785. doi: 10.1016/j.mex.2020.100785

Fig. 3.

Fig. 3

Density separation efficiency (based on the number of particles recovered) of the initial and reused ZnCl2 solutions (F0 = Initial ZnCl2 solution (concentration = 700 g/L); F1 = ZnCl2 solution after being reused once; F2 = ZnCl2 solution after being reused twice; F3 = ZnCl2 solution after being reused three times; F4 = ZnCl2 solution after being reused four times; F5 = ZnCl2 solution after being reused five times). Each bar has an indication, at the top, of the efficiency (%) of the initial and reused ZnCl2 solutions.