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. 2018 Jun 13;22:17. doi: 10.1186/s40824-018-0127-9

Fig. 5.

Fig. 5

a Chemical structure of xylenol orange with or without metal ion. b Xylenol orange solution in the presence of Gd3+ ion at various concentrations. c Formula for free ion determination. d Xylenol orange solution in the presence of Gd-DOTA-LAE