两性化合物与离子对试剂的混合物作流动相的流动相离子色谱法测定气溶胶中水溶性阴离子

用流动相离子色谱法(MPIC)，以两性化合物与离子对试剂的混合溶液为流动相，在C18柱上抑制电导检测分析气溶胶中常规无机阴离子和有机酸。实验采用氢氧化四丁基铵(TBAOH)为离子对试剂，与两性化合物3-(N-吗啉)-1-丙磺酸(MOPS)混合，加入Na2CO3无机添加剂作流动相，其浓度为1mmol／L TBAOH／5mmol／LMOPS／0．5mmol／LNa2CO3。分离柱采用硅质C18柱，抑制电导检测。可以较好地分离和检测常见的无机和有机阴离子。该方法具有较好的重现性和线性关系，F^-、Cl^-、NO2^-、Br^-、C3H3O3^-、NO3^-的回收率分别为102．0％、104．6％、102．4％、97．8％、97．75％和102．5％；检出限分别为0．017、0．014、0．0048、0．036、0．16和0．017mg／L。

Determination of Inorganic Anions and Organic Acids in Atmospheric Aerosols by Mobile Phase Ion Chromatography Using Zwitterion as Eluent

Mixture of ion-pair reagents and zwitterions are used as mobile phase for silica C 18 column to separate common anions and organic acids, and detection by suppressed conductivity is investigated. In the study, mixture of 1 mmol/L tetrabutyl-ammonium hydroxide (as ion-pair reagent), 5 mmol/L 3-(N-morpholine)-propane-sulfonic acid (zwitterion) and 0 5 mmol/L Na 2CO 3 (inorganic additive) as eluent , a silica-based C 18 separator column, and suppressed conductivity detector for analysis several anions inclucling F -, Cl -, Br -, NO - 2, NO - 3, pyruvate. Good linear relationship, sensitivity and reproducibility were obtained. The detection limits of these anions were 0.017, 0.014, 0.0048, 0.036, 0.16 and 0.017 mg/L respectively. The method has been applied to determine common anions and organic acids, the results are available.