摘要
本文采用离子色谱与恒电位法联用方法对菠菜中硝酸盐进行检测.采用硝酸为流动相,以IonPacAS11-HC阴离子交换柱分离后以恒电位仪为检测器进行安培检测,进样量为25μL时NO3-离子的检出限(以3倍信噪比计)可降至0.2μg/L,痕量NO3-离子标准溶液平行9次进样测定的相对标准偏差为2.5%,经过几百组测试,稳定性好、线性、重现性及灵敏度均令人满意.
The nitrate ion determination using ion chromatography has been researched in the paper.With the CHI660 Electrochemical Detector,the Detection Limit of the method（S/N ratio of 3） has reached 0.2μg/L（25μL injected）,using sodium hydroxide as the mobile phase and the AS11-HC as the separate column.The Relative Standard Deviation（RSD） was 2.5%（n=9）.A method of constant potential has been established and compared with the conductivity detector method and with the method of nitrate acid mobile phase.As a result,the constant potential Determination method is better than the suppressed conductivity method and the constant potential method with the nitric acid.
出处
《内蒙古民族大学学报（自然科学版）》
2009年第3期263-265,共3页
Journal of Inner Mongolia Minzu University：Natural Sciences
基金
国家自然科学基金项目(20871054)
福建省教育厅基金项目(2007F5076)
福建省自然科学基金高校专项基金项目(2007J0369)
关键词
离子色谱
硝酸盐
恒电位法
Ion chromatography
Nitrate ion
Constant potential
