用流动注射仪测定总氮水样，发现用不同的硫酸浓度保存总氮样品时，对其测定结果有一定的影响，并与过硫酸钾氧化-紫外分光光度法进行比对和分析。
In the determination of total nitrogen in water sample by flow injection analysis instrument, the concentration of sulfuric acid which used for the preservation of sample affected the result.
包括：分光光度法、比浊法、原子吸收法、极谱法、电导法、离子选择电极法、离子色谱法和流动注射分析法等。
The methods are as follows: spectrophotometry, turbidimetry, atomic absorption spectrometry, polarography, conductance, ion selective electrode, ion chromatography, and flow injection analysis etc.
结果表明，流动注射分光光度法和化学计量技术的联用，有可能实现对食品用水重金属突发性污染的在线监测和预警。
Rusults above concludes that combination of FIA, spectrophotometry and P-matrix model could detect the emergency pollution of heavy metals in the food water and alarm early this pollution on-line.
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