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. 2019 Oct 1;4(16):16789–16793. doi: 10.1021/acsomega.9b01550

Table 1. Orthogonal Layout Design.

level extraction time (A) (min) rotation speed (B) (rpm) pH (C) NaCl concentration (D) (%)
1 40 600 2 0
2 60 800 4 5
3 80 1000 6 10