电感耦合等离子体原子发射光谱法测定汽油中硫

Determination of sulfur in gasoline by inductively coupled plasma atomic emission spectrometry

使用航空煤油稀释汽油样品后,选择S 180.669nm作为分析线,采用加氧制冷带挡板旋流雾室引入氧气并对雾化室进行冷却以消除积碳影响、保持等离子体的稳定,建立了使用电感耦合等离子体原子发射光谱法(ICP-AES)测定汽油中硫的方法。重点研究了稀释剂稀释比与氧气流量对检测结果的影响,确定了最佳分析条件,稀释剂稀释比例为1∶9,氧气流量为80mL/min。通过多元光谱拟合(MSF)校正了有机基体的干扰。方法的检出限为0.15mg/kg。按照实验方法测定两个汽油样品中硫,结果的相对标准偏差(RSD,n=10)均小于1%;按照实验方法和标准方法 GB/T 11140—2008、SH/T 0689—08测定5个汽油样品中硫,测定结果相吻合。

The gasoline sample was diluted with aviation kerosene. S 180. 669 nm was selected as the analytical line. The oxygen was introduced using oxygen refrigeration rotary spray chamber with baffle. The spray chamber was cooled to eliminate the influence of carbon deposition and stabilize the plasma. The determination method of sulfur in gasoline by inductively coupled plasma atomic emission spectrometry （ICP- AES） was established. The effect of dilution ratio and oxygen flow rate on determination results was focused on. The optimal analytical conditions were obtained： the dilution ratio was 1 ： 9 , and the oxygen flow rate was 80 mL/min. The interference of organic matrix was corrected by multi-component spectral fitting （MSF）. The detection limit of method was 0. 15 mg/kg. The content of sulfur in two gasoline samples was determined according to the experimental method. The relative standard deviations （RSD, 10） were less than 1 %. The content of sulfur in five gasoline samples was determined by the proposed method and standard methods （GB/T 11140-2008 and SH/T 0689-2008）, and the found results were consistent.