Abstract
An online detection system for nitrate in seawater was designed and set up based on flow injection analysis and spectrophotometry. We used this system to compare and study the two reduction methods for nitrate in seawater: cadmium column reduction method and UV light-induced reduction method. The cadmium column could reach the optimal reduction condition in 300 s while the UV light could reach the optimal reduction condition in 480 s. The two methods both had good linear relationship in the range of 5-500 μg/L. The reduction efficiency for Cd-column and UV light were 95% and 80% respectively under the same conditions. The detection limit was 2.5 μg/L for Cd-column reduction method and was 3.4 μg/L for UV-induced reduction method. The relative standard deviation (RSD) for the two methods were both less than 3%. The recovery rate for Cd-column reduction method and UV-induced reduction method were 98.22% and 100.83% respectively.
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