采用离子交换-抑制电导法测定海水中阴、阳离子.采用抑制电导可以降低淋洗液的背景电导,又可以增加被测离子的电导值,改善信噪比.采用的电化学自身再生抑制器,由连续电解水产生抑制淋洗液所需要的H+或者OH-,加上电场引力,能用于高容量分离柱所用的淋洗液浓度和梯度淋洗.在试验条件下,利用阴离子和阳离子分离柱,配合抑制电导检测,可以同时分离和测定海水中7种阴离子和6种阳离子.且都可以得到很好的线性和较低的检出限.

Ion chromatography with suppression conductometric detection was applied to the determination of anions and cations in sea water.The use of suppression-conductometry showed the special features of lowering the background of the eluent,increasing the conductance of the detected ions and improving the S/N ratio.Amounts of H+ and OH- required to suppress the eluent were supplied by an electrochemical self-generating suppressor through continuous electrolysis of water.Anions and cations in sea water were separated and determined simultaneausly by the combining use of anion separation column (and/or cation separation column) with suppression-conductometric detection,and by the use of equi-grading and/or gradient elution.Data of linear regression equations and detection limits of 7 anions and 6 cations were given.