液化气中元素硫的高效液相色谱法分析

Determination of Elemental Sulfur in Liquefied Gas by High Performance Liquid Chromatography

应用溶剂萃取、冷却气化方法对液化气样品进行前处理。对前处理制备的样品使用高效液相色谱法进行测定，以甲醇／水＝９５／５（Ｖ／Ｖ）为流动相，紫外检测（２５４ｎｍ），在Ｃ１８柱上成功地分离并测定了元素硫的含量。方法检测限为０．１ｎｇ／ｇ，有良好的准确度与精密度。

A method for the determination of elemental sulfur in liquefied gas has been developed in this work. First, the elemental sulfur existed in the liquefied gas was extracted by chloroform and the volatile petroleum hydrocarbons vaporized with a rate of ca. 500mL/min at low temperature in an ice water bath. The elemental sulfur dissolved in chloroform was then determined by high performance liquid chromatography. The operating conditions were:300×4mm i.d. μ Bondapak C 18 column; 0 8mL/min methanol water, 95/5( V/V ),as eluent and UV 254nm detector. The average recovery of elemental sulfur was 98 3% and the minimum detectable limit was 0 1ng/g.