DERIVATIVE ABSORPTION SPECTRA OF THE SYSTEM OF Ln~(3+)(Pr~(+3), Nd~(3+), Sm~(3+), Eu~(3+), Ho~(3+), Er~(3+))-H_2C_2O_4-EDTA AND ITS APPLICATION

• 镧系(Pr~(3+),Nd~(3+),Sm~(3+),Eu~(3+),Ho~(3+),Er~(3+))-H_2C_2O_4-EDTA体系的导数吸收光谱及其分析应用