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. 2019 Nov 28;19(23):5246. doi: 10.3390/s19235246

Figure 3.

Figure 3

SPR spectra obtained by the SPR-POF sensor at different concentrations of Cu(II) in solution 0.1 M NaCl at pH = 2, over the concentration range from 0 M to 1.5 × 10−4 M.