305124.fig.009a
(a)
305124.fig.009b
(b)
305124.fig.009c
(c)
305124.fig.009d
(d)
Figure 9: Upper: chromatograms of TC and its (a) Au(III) and (b) Hg(II) complexes with retention times (1.865, 2.932 min) and (3.189, 7.568 min), respectively, at detection 220 and 276 nm, respectively. Lower: direct calibration curves for the determination of TC-Au(III) and TC-Hg(II) complexes by HPLC method.