摘要
以溴离子(Br-)为内标,建立了毛细管离子电泳同时测定腌菜中的硝酸根和亚硝酸根的方法。讨论了缓冲液pH、样品和缓冲液中氯化钠浓度、分离电压对分离的影响。结果表明:以含1mol LNaCl的40mmol LH3PO4 NaOH缓冲-、-得到基线分离。NO3-和NO2液(pH3.5)为背景电解质,4min内Br-、NO3-检出限分别为0.1g L和0.3g L,峰面积相对标准偏差分别为4.6%和NO25 8%。
A method, in which Br^- was used as the internal standard, was developed for the simultaneous determination of nitrate and nitrite in pickle samples by capillary ion electrophoresis. The running buffer was composed of 40 mmol/L H_3PO_4-NaOH and 1 mol/L NaCl (pH 3.5). The two analytes in pickle samples were successfully determined within 7 min. The detection limit of nitrate and nitrite were 0.1 and 0.3 g/L, respectively. The relative standard deviations of peak areas were 4.6% and 5.8%, respectively.
出处
《分析试验室》
CAS
CSCD
北大核心
2004年第5期34-36,共3页
Chinese Journal of Analysis Laboratory
