UV-detection capillary electrophoresis for benzo[a]pyrene and pyrene following a two-step concentration system using homogeneous liquid-liquid extraction and a sweeping method

摘要

10~(-9) mol l~(-1) levels of polycyclic aromatic hydrocarbons (PAHs) suspected for certain noxious maaterials can be determined and separated by UV-detection capillary electrophoresis followeing a two-step concentration system. When the conditions of the homogeneous liquid-liquid extraction were [THF]_T = 5 vol%, [HCl]_T = 0.66 mol l~(-1), and [PFOA]_A = 2 X 10~(-3) mol l ~(-1) (i.e., the volume of sample solution; 50 ml -> sedimented phase; 30 #mu#l), the extractoin percentages of benzo[a]pyrene (Bap) and pyrene (Py) at 10~(-6) mol l~(-1) were 102 and 97.5%, respectively. Also, when the total concentration factor (volume ratio), which incudes that of the sweeping method, was 8335-fold, the determination range of Bap was 6.4 X 10~(-9) - 8.0 X 10~(-7) mol l~(-1) and for Py, 8.0 X 10~9-9) - 7.0 X 10~(-7) mol l~(-1). The detection limits (3#delta#) of Bpa and Py were 1.6 X 10~(-9) and 4.8 X 10~(-9) mol l~(-1), respectively.