Automation of flow injection gas diffusion-ion chromatography for the nanomolar determination of methylamines and ammonia in seawater and atmospheric samples.

S W Gibb, J W Wood, R Fauzi, C Mantoura
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引用次数: 22

Abstract

The automation and improved design and performance of Flow Injection Gas Diffusion-Ion Chromatography (FIGD-IC), a novel technique for the simultaneous analysis of trace ammonia (NH(3)) and methylamines (MAs) in aqueous media, is presented. Automated Flow Injection Gas Diffusion (FIGD) promotes the selective transmembrane diffusion of MAs and NH(3) from aqueous sample under strongly alkaline (pH > 12, NaOH), chelated (EDTA) conditions into a recycled acidic acceptor stream. The acceptor is then injected onto an ion chromatograph where NH(3) and the MAs are fully resolved as their cations and detected conductimetrically. A versatile PC interfaced control unit and data capture unit (DCU) are employed in series to direct the selonoid valve switching sequence, IC operation and collection of data. Automation, together with other modifications improved both linearily (R(2) > 0.99 MAs 0-100 nM, NH(3) 0-1000 nM) and precision (<8%) of FIGD-IC at nanomolar concentrations, compared with the manual procedure. The system was successfully applied to the determination of MAs and NH(3) in seawater and in trapped particulate and gaseous atmospheric samples during an oceanographic research cruise.

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流动注射气体扩散离子色谱法测定海水和大气样品中甲胺和氨的纳摩尔含量的自动化。
介绍了流动注射气体扩散-离子色谱(FIGD-IC)的自动化和改进设计和性能,这是一种同时分析水介质中微量氨(nh3)和甲胺(MAs)的新技术。自动流动注射气体扩散(FIGD)促进了强碱性(pH > 12, NaOH),螯合(EDTA)条件下的水样品中MAs和NH(3)的选择性跨膜扩散到循环酸性受体流中。然后将受体注入离子色谱仪,其中nh3和MAs作为阳离子被完全分解并进行电导检测。采用多用途PC接口控制单元和数据采集单元(DCU)串联,指导阀开关顺序、IC操作和数据采集。自动化与其他修改一起提高了线性(R(2) > 0.99 ma 0-100 nM, NH(3) 0-1000 nM)和精度(
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