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. 2021 May 12;6(20):13057–13065. doi: 10.1021/acsomega.1c00685

Figure 2.

Figure 2

Response surface plots illustrating (a) effects of first cross-linking ECH (X1) and imprinting pH (X2) on the selectivity coefficient at the high level of the second cross-linking ECH (X3), (b) effects of first cross-linking ECH (X1) and second cross-linking ECH (X3) on the selectivity coefficient at the low level of the imprinting pH (X2), and (c) effects of imprinting pH (X2) and second cross-linking ECH (X3) on the selectivity coefficient at the low level of the first cross-linking ECH (X1).