DERIVATIVE ABSORPTION SPECTRA OF THE SYSTEM OF LANTHANIDES (Nd~(3+), Ho~(3+), Er~(3+))--1-PHENYL-3-METHYL-4-BENZOYLPYRAZOLONE-[5]--DIPHENYLGUANIDINE AND ITS ANALYTICAL APPLICATION

• 镧系(Nd~(3+),Ho~(3+),Er~(3+))-1-苯基-3-甲基-4-苯甲酰基吡唑酮-[5]-二苯胍系统的导数吸收光谱及其分析应用