氧瓶燃烧—离子色谱法测定香菜中氯、氮、硫的含量

Determination of Chlorine,Nitrogen and Sulfur incoriander by Oxygen Flask Combustion-Ion Chromatography

[目的]利用氧瓶燃烧-离子色谱法测定汕头和潮州香菜根叶茎中氯、氮、硫含量的分析方法;[方法]研磨碎的香菜经氧瓶燃烧分解,用NaOH+H2O2吸收,离子色谱法以0.8 mmol/LNaHCO3+4.5 mmol/LNa2CO3为淋洗液、AS23型阴离子分析柱、抑制电导检测。[结果]汕头香菜根叶茎氯、氮、硫的含量不相同,潮州香菜根叶茎氯、氮、硫的含量也不相同,且汕头香菜的根叶茎与潮州香菜根叶茎中氯、氮、硫的含量相差较大。[结论]汕头香菜中氯、氮、硫的含量较潮州多,其叶含有更多的蛋白质等能量物质供给成长,所以叶子比较茂盛;其种植地比较接近海边或公路,受汽车尾气的影响较大。

[ Objective] Anoxygen flask combustion -ion chromatographic method was used for the content determination of chlorine, nitrogen and sulfur in root, leaf and stem of Shantou coriander and Chaozhou coriander. [ Method] The ground coriander was first burnt in the oxygen flask, then the combustion products were absorbed in NaOH - H2O2 solution, which was analyzed by ion chromatography using 0.8 mmol/L Na2CO3 ＋ 4.5 mmol/L NaHCO3 as mobile phase, AS23 separation column and suppressed conductivity detection. [ Result] The content of chlorine, nitrogen and sulfur in root, leaf and stem of Shantou coriander was different, the content of chlorine, nitrogen and sulfur in root, leaf and stem of Chaozhou coriander was also different, and Shantou coriander and Chaozhou one had larger content difference between chlorine, nitrogen and sulfur in root, leaf and stem. [Conclusion] Shantou coriander has more content of chlorine, nitrogen and sulfur than Chaozhou coriander, whose leaves have more energy materials like protein supplying growth, so the leaves are more frondent; its cultivated fields is closer to sea or road, where it is strongly influenced by vehicle exhaust.