cr2O2、MnO4的吸收光谱 (Absorption spectra of Cr20,2- Mno 525545 350 MnO4 10000 Cr2072 440 nmCr2O7 2-、MnO4 -的吸收光谱 (Absorption spectra of Cr2O7 2-、 MnO4 - ) 350 400 500 600 700 /nm 525 545 Cr2O7 2- MnO4 - 1.0 0.8 0.6 0.4 0.2 A b s o r b a n c e 350 440 nm