海水中二甲基硫测定方法的研究

二甲基硫（ＤＭＳ）是雨水天然酸性的贡献者和影响气候变化的重要痕量气体，本文海水中ＤＭＳ测定方法，即采用冷却预浓缩技术处理海水样品，用带有火焰光度检测器气相色谱仪分析，此方法的精密度为１２％，准确度为１０％，对１００ｍｌ海水样品最小检测量为０．０５４ｎｇ（ＤＭＳ）。同时对色谱柱的选取，实验材料的选择，浓缩柱填充材料的选择，鼓气效率，干燥管，样品解析，样品保存等有关实验步骤进行了讨论。

RESEARCH ON DETERMINATION OF DIMETHYL SULFIDE IN SEA WATER .

Dimethyl sulfide(DMS) is not only the major contributor to the acidity of natural precipitation , but also a potentially important trace gas which affects the change in climate. A determination method of DMS in sea water has been developed,that is,cryogenic technique is applied to pre-concentrate the sample of sea water, then a gas chromatograph with a flame photometric detector is used to analyse. Accuracy is 10%. Precision is 12%. The minimum detection limit is 0. 054 ng (DMS) corresponding to a concentration of 0. 54ng (DMS)/1 for a 100 ml sample. Meanwhile, selections of chromatographic column,experiment materials,packing materials in cold trap,stripping efficiency, drying of gas stream, desorption efficiency and sample efficiency, drying of gas stream,desorption efficiency and sample storage are also discussed.