|关键词: 海水 总氮 过硫酸钾氧化法 流动注射分析法 高温氧化-化学发光检测法
|Comparative Study on Determination of Total Nitrogen in Seawater
CHEN Ying，MA Lin
Dalian City Fishery Technical Extension Station, Dalian Marine and Fishery Environmental Monitoring Center, Dalian, Liaoning 116023, China
|The potassium persulfate oxidation, flow injection analysis, and high temperature oxidation chemiluminescence detection methods were compared from the standard curve, detection limit and measurement range, method precision, accuracy test, actual seawater sample determination results, determination of recovery rate, analysis efficiency and material consumption. The experimental results indicated that, the measurement range of flow injection analysis and high temperature oxidation chemiluminescence detection were wider, the precision and accuracy were better, and the spiked recoveries of the three samples were between 96.2% and 101%. The high temperature oxidation chemiluminescence detection method had high analysis efficiency, low material consumption, energy saving and environmental protection, but it showed high detection limit, so it was more suitable for the analysis of bulk seawater samples with higher total nitrogen content. Flow injection analysis was more suitable for the analysis of bulk seawater samples with lower total nitrogen content because of its lower detection limit.
|Key words: Seawater Total nitrogen Potassium Persulfate Oxidation Flow Injection High Temperature Oxidation chemiluminescence