离子色谱-抑制电导法分别测定海水中阴离子和阳离子

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，能用于高客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。

IC DETERMINATION OF ANIONS AND CATIONS IN SEA WATER WITH SUPPRESSION-CONDUCTIVITY DETECTION

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.