Abstract：In view of high salt characteristics of pore water of ocean sediments, the water samples were treated by dilution method. The contents of cations (including Li+, Na+, NH+4, K+, Mg2+, Ca2+ and Sr2+) were determined by ion chromatography. The optimal measurement conditions of instrument were discussed. The analysis effect of various chromatographic columns was especially investigated. The CS12A column was finally selected for analysis. For the high salt of pore water, the contents of Li+, Na+, NH+4, K+, Mg2+, Ca2+ and Sr2+ were determined when the dilution factor was 500, 200, 100, 50, 20 and 10. The results showed that seven cations could be well separated with CS12A column. The correlation coefficients of calibration curves were higher than 0.999 3. Na+, K+, Mg2+ and Ca2+ in pore water could be determined when the sample was diluted for 100 times, while Li+, Sr2+ and NH+4 could be determined when the sample was diluted for 20 times. The detection limit of method was 0.13-1.14 μg/L. The precision test was also conducted. The relative standard deviations (RSD, n=11) were between 0.31% and 1.7%. The pore water sample 48GC was determined according to the experimental method. The recovery test of standard addition was also performed. The recoveries were between 90% and 107%.
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