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Element-based principal component analysis of air pollution control residues (A) and bottom ash (B). NCWG and CWG denote incineration residue samples from incinerator without and with clinical waste input, respectively. Box plots show the overall distribution of Dim1 and Dim2 within NCWG and CWG (Student's t-test; NS represents P > 0.05, * denotes 0.01 < P < 0.05, ** signifies 0.001 < P < 0.01, * and ** indicate statistically significant difference).
