fig3
Figure 3. PCA of BPs (detection frequency > 50%) in (A) ZY, (B) FJ, (C) BH, and (D) QY. PCA: Principal component analysis; BPs: bisphenol analogues; ZY: Ziya circular economy Industrial Park; FJ: Fengjiang Metal Resource Recycling Park; BH: Binhai Metal Resource Recycling Park; QY: Qingyuan circular economy Industrial Park; BPAF: bisphenol AF; BPAP: bisphenol AP; BPF: bisphenol F; BPA: bisphenol A; TBBPA: tetrabromobisphenol A; BPB: bisphenol B.
