with the mixed solution of EDTA and H_ cit as the eluant, the kinetic of the chromatographic precess is better than that采用EDTA+H_ cit混合洗提剂时,动力学性能比单独用EDTA时有所改善,而且随着H_ cit浓度的增加,色谱动力学性能也表现得越来越好;