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XPS analyses of C 1s (a, d, h, and l), N 1s (b, e, i, and m), and O 1s (c, f, j, and n) for PANIPN21 and Hg(II)-, Cd(II)-, and Cr(III)-PANIPN21; Hg 4f7/2 and 4f5/2 (g), Cd 3d5/2 (k) and Cr 2p3/2 (o) of Hg(II)-, Cd(II)-, and Cr(III)-PANIPN21, respectively.
