Rapid flow injection analysis method for successive determination of ammonia, nitrite, and nitrate in water by gas-phase chemiluminescence
Rapid flow injection analysis method for successive determination of ammonia, nitrite, and nitrate in water by gas-phase chemiluminescence
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DOI：
10.1016/s0003-2670(97)00273-0
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发表时间：
1997-08
影响因子：
6.2
通讯作者：
T. Aoki;S. Fukuda;Yasuo Hosoi;H. Mukai
中科院分区：
文献类型：
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作者：
T. Aoki;S. Fukuda;Yasuo Hosoi;H. Mukai
提出了一种流动注射分析方法，其中使用水性样品本身作为载流并将试剂注入到该样品流中。使用碘化物和钛(III)作为还原剂，亚硝酸盐和硝酸盐在酸性介质中分别转化为一氧化氮(NO)。氨与次氯酸盐反应生成挥发性化合物。 NO 或挥发性化合物在玻璃管分离器中转移到空气中，随后挥发性化合物通过在 600 °C 下燃烧转化为 NO。然后NO与臭氧反应并检测所产生的化学发光。氨和硝酸盐的测定限为1 × 10−8M，亚硝酸盐的测定限为1 × 10−8M。一份样品中氨、亚硝酸盐和硝酸盐的分析总时间不到 3 分钟。
A flow injection analysis method is presented in which an aqueous sample itself is used as the carrier stream and reagents are injected into this sample stream. Nitrite and nitrate were converted into nitric oxide (NO) in acidic media using iodide and titanium(III) as reducing agents, respectively. Ammonia was reacted with hypochlorite to generate a volatile compound. The NO or the volatile compound was transferred into air in a glass-tube separator and the volatile compound was subsequently converted into NO by combustion at 600 °C. The NO was then reacted with ozone and the resulting chemiluminescence was detected. The determination limit was 1 × 10−8M for ammonia and nitrate, and was 1 × 10−8M for nitrite. The total time for the analysis of ammonia, nitrite, and nitrate in one sample was less than 3 min.