ONLINE PHOTOOXIDATION FOR THE DETERMINATION OF ORGANOARSENIC COMPOUNDS BY ATOMIC-ABSORPTION SPECTROMETRY WITH CONTINUOUS ARSINE GENERATION
ONLINE PHOTOOXIDATION FOR THE DETERMINATION OF ORGANOARSENIC COMPOUNDS BY ATOMIC-ABSORPTION SPECTROMETRY WITH CONTINUOUS ARSINE GENERATION
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DOI：
10.1016/0039-9140(91)80125-j
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发表时间：
1991-02-01
期刊：
影响因子：
6.1
通讯作者：
KALMAN, DA
中科院分区：
文献类型：
--
作者：
ATALLAH, RH;KALMAN, DA
建立了一种在线将有机砷转化为砷酸盐的方法，该方法易于用连续生成砷酸盐的原子吸收光谱法检测。光反应器由水银灯包裹5米聚四氟乙烯管（0.5毫米直径）组成。采用流动注射分析方法，优化了砷甜菜碱、一甲基胂酸、二甲基胂酸、组微粒胂酸和苯基胂酸等具有重要生物和环境意义的有机砷化合物的光氧化条件。溶液以2.0 ml/min的流速连续泵送，并与过硫酸钾（流速0.6 ml/min）混合，然后进入光反应器。在反应器停留时间为36秒的条件下，这些化合物的转化率在95%以上。将该流动转换和检测系统与色谱入口相连接，可以以适合环境或生物医学样品的方式实时分析这些有机砷化合物的混合物。
A method has been developed for on-line conversion of organoarsenicals into arsenate, which is readily detected by atomic-absorption spectrometry with continuous arsine generation. The photo-reactor consists of a mercury lamp wrapped with 5 m of PTFE tubing (0.5 mm i.d.). The photo-oxidation conditions were optimized, with a flow-injection analysis procedure, for arsenobetaine, monomethyl-arsonic acid, dimethylarsinic acid, omicron-arsanilic acid, and phenylarsonic acid, all organoarsenicals of biological and environmental importance. Solutions were continuously pumped at a flow-rate of 2.0 ml/min and combined with a stream of potassium persulfate (flow-rate 0.6 ml/min) before entering the photo-reactor. With reactor dwell times of 36 sec, conversion efficiencies for these compounds were above 95% under these conditions. Interfacing of this flow-through conversion and detection system with a chromatographic inlet permits real-time analysis of mixtures of these organoarsenic compounds, in a manner suitable for environmental or biomedical samples.