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. 2020 Oct 22;5(43):27953–27961. doi: 10.1021/acsomega.0c03388

Table 2. Orthogonal Experiment Factors and Levels for FA Extraction Using H2O2a.

  factor
level A B C D
1 9 18 200 8
2 10 21 300 10
3 11 24 400 12
a

Note: A—oxygen–coal ratio; B—H2O2 concentration/%; C—microwave power/W; D—time/min.