论文部分内容阅读
用国产高效离子交换色谱仪及国产阴离子交换树脂研究了分离SO_3~(2-),S~(2-),S_2O_3~(2-)的色谱条件。以硝酸钠为洗脱液,可在九分钟内完全分离上述离子。进行了一些样品的定量测定,用无换向阀的预柱富集测定了污水中PPm级的S~(2-)及定量回收了ppb级的S_2O_3~(2-)。从色谱动力学的观点试讨论了SO_3~(2-),S~(2-)及S_2O_3~(2-)的色谱行为,得出了用结构参数及实验条件估算分配系数D的经验式: 式中a是与离子性质及交换条件有关的常数,k为硫化物阴离子中硫原子的数目,Z为硫的平均氧化数,B为洗脱液浓度。
The chromatographic conditions for SO_3 ~ (2 -), S ~ (2 -) and S_2O_3 ~ (2-) separation were studied by domestic high performance ion exchange chromatography and homemade anion exchange resin. With sodium nitrate as eluent, the above ions can be completely separated within nine minutes. The quantitative determination of some samples was carried out. Pre-column enrichment with no diverter valve was used to determine the PP2 level of S ~ (2-) and the quantitative recovery of ppb level of S_2O_3 ~ (2-). The chromatographic behaviors of SO_3 ~ (2-), S ~ (2-) and S_2O_3 ~ (2-) were discussed from the viewpoints of chromatographic kinetics. The empirical formula for estimating the partition coefficient D using structural parameters and experimental conditions was obtained: Where a is a constant related to ionic properties and exchange conditions, k is the number of sulfur atoms in sulfide anions, Z is the average oxidation number of sulfur, and B is the eluent concentration.