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在pH4.4的0.2mol/l HOAc—NH_4OAc底液中,可获得胭脂红酸(CA)的可逆单扫极谱吸附波。加入Sc(Ⅲ)后,溶液由橙红色变为紫色,CA的极谱波峰高降低,表明络合物
The reversible single-sweep polarographic adsorption wave of carminic acid (CA) was obtained in 0.2 mol / l HOAc-NH4OAc solution at pH4.4. After addition of Sc (Ⅲ), the solution changed from orange-red to purple, and the peak height of CA decreased, indicating that the complex