建立了一种同时测定离子液体中六氟磷酸根(PF-6)和痕量杂阴离子氟、氯、溴(F-,Cl-,Br-)的离子色谱方法(IC).样品经溶解、稀释、过滤后用Dionex IonPac AS22分离柱(250 mm×4 mm)分离,淋洗液为碳酸盐-乙腈体系(体积比为70∶30),流速1.0 mL/min,采用Dionex DS6电导检测器检测,外标法定量.F-,Cl-,Br-和PF-6的线性范围分别为0.5~50 μg/L、10~200 μg/L、10~200 μg/L 和0.9~45 mg/L,线性相关系数分别为 0.9999,0.9998,0.9999和 0.9998,加标回收率为94.5% ~100.5% ,相对标准偏差为0.63% ~1.03% ,检出限(以信噪比为3计)分别为0.5 μg/L、2.0 μg/L、5.0 μg/L 和0.9 mg/L.该方法用于离子液体中六氟磷酸根和痕量杂阴离子的同时测定,结果令人满意.
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