离子色谱法测定地表水中的叠氮根
【摘 要】本文建立了一种采用离子色谱法抑制型电导检测地表水中叠氮化物(N3-) 的方法。选择的色谱条件为IonPac AS18离子交换柱,KOH 梯度淋洗,抑制型电导检测,对河水中N3-进行测定。河水样品经过过滤、OnGuard ⅡRP 和OnGuard Na预处理小柱过滤,消除了基体干扰,直接进样分析。该方法线性相关系数r 大于0.999,实际样品RSD 小于2%,具有灵敏度高,选择性好,操作简单,对环境友好等特点。
【关键词】离子色谱;河水;叠氮化物
A Simple Ion-chromatography Method for Determination of Trinitride in Surface Water
M IN Dao-zhu FAN Xiao-jun WEI Chao-kang
(Environmental Monitoring Station of Nanchang,Nanchang Jiangxi,330002)
【Abstract 】A method was developed for analysis of trinitride(N3-) in surface water by application of Ion-chromatography coupled with inhibitory conductance. The IonPac AS18 ion exchange column, KOH gradient elution and inhibitory conductivity determination were selected for chromatography conditions to determinate trinitride. The water samples were filtrated by the preprocessed columella of OnGuard II RP and OnGuard Na, which could eliminate matrix interference to direct sample analysis. Under optimal conditions, the linear correlation coefficient was 0.999 and the relative standard deviation of real samples was 2%. This method has the characteristic of high sensitivity, excellent selectivity, simple manipulation and less environmental contaminate.
【Key words】Ion-chromatography ;Surface water;Trinitride
叠氮化钠是一种剧毒物质,毒性仅次于氰化物。常用于汽车安全气囊的气体填充物,有机合成中间体,在军事上用来制造雷管。叠氮化物一旦进入环境,通过“水→人体”,或通过“土壤→水→人体”被人体吸收,就会危及人体健康。因此,有必要建立一种准确、灵敏的方法,用于监测水体中叠氮化物的残留。
文献报导测定叠氮化物的方法有容量分析法、分光光度法,这两种方法在测定低浓度叠氮化物时不够准确;气相色谱法、高效液相色谱法一般需要对样品进行衍生化预处理,衍生化反应的缺点是前处理繁琐,且会引人外源性干扰。离子色谱作为一种快速灵敏准确的测试方法,其应用领域不断扩大。本文利用免试剂离子色谱法(RFIC)技术,采用自动淋洗液发生器产生的梯度氢氧化钾溶液作为淋洗液,快速、简便地测定了河水中的叠氮化物残留量,并可同时测定其它常见的阴离子,如F -、Cl -、Br -、NO2-、NO3-、PO43-和SO42-等。
离子色谱法测定地表水中的叠氮根
【摘 要】本文建立了一种采用离子色谱法抑制型电导检测地表水中叠氮化物(N3-) 的方法。选择的色谱条件为IonPac AS18离子交换柱,KOH 梯度淋洗,抑制型电导检测,对河水中N3-进行测定。河水样品经过过滤、OnGuard ⅡRP 和OnGuard Na预处理小柱过滤,消除了基体干扰,直接进样分析。该方法线性相关系数r 大于0.999,实际样品RSD 小于2%,具有灵敏度高,选择性好,操作简单,对环境友好等特点。
【关键词】离子色谱;河水;叠氮化物
A Simple Ion-chromatography Method for Determination of Trinitride in Surface Water
M IN Dao-zhu FAN Xiao-jun WEI Chao-kang
(Environmental Monitoring Station of Nanchang,Nanchang Jiangxi,330002)
【Abstract 】A method was developed for analysis of trinitride(N3-) in surface water by application of Ion-chromatography coupled with inhibitory conductance. The IonPac AS18 ion exchange column, KOH gradient elution and inhibitory conductivity determination were selected for chromatography conditions to determinate trinitride. The water samples were filtrated by the preprocessed columella of OnGuard II RP and OnGuard Na, which could eliminate matrix interference to direct sample analysis. Under optimal conditions, the linear correlation coefficient was 0.999 and the relative standard deviation of real samples was 2%. This method has the characteristic of high sensitivity, excellent selectivity, simple manipulation and less environmental contaminate.
【Key words】Ion-chromatography ;Surface water;Trinitride
叠氮化钠是一种剧毒物质,毒性仅次于氰化物。常用于汽车安全气囊的气体填充物,有机合成中间体,在军事上用来制造雷管。叠氮化物一旦进入环境,通过“水→人体”,或通过“土壤→水→人体”被人体吸收,就会危及人体健康。因此,有必要建立一种准确、灵敏的方法,用于监测水体中叠氮化物的残留。
文献报导测定叠氮化物的方法有容量分析法、分光光度法,这两种方法在测定低浓度叠氮化物时不够准确;气相色谱法、高效液相色谱法一般需要对样品进行衍生化预处理,衍生化反应的缺点是前处理繁琐,且会引人外源性干扰。离子色谱作为一种快速灵敏准确的测试方法,其应用领域不断扩大。本文利用免试剂离子色谱法(RFIC)技术,采用自动淋洗液发生器产生的梯度氢氧化钾溶液作为淋洗液,快速、简便地测定了河水中的叠氮化物残留量,并可同时测定其它常见的阴离子,如F -、Cl -、Br -、NO2-、NO3-、PO43-和SO42-等。