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阐述了一种基于碱性条件下,采用还原液将硝酸盐还原为亚硝酸盐,从而实现淡水中硝酸盐的还原液-流动注射分光光度检测方法,通过优化实验确定了最优分析条件。硝酸盐浓度在50～2000μg/L范围内与峰高呈良好的线性关系,方法检出限3.5μg/L,相对标准偏差0.90%(n=15,500μg/L)。方法应用于环境水样中硝酸盐的检测,加标回收率为95.0%～100.2%。该方法避免了镉还原柱再生处理,简化了操作,易于实现无人值守式的在线自动监测。
A reducing liquid - flow injection spectrophotometric detection method based on the reduction of nitrate to nitrite with reducing solution under alkaline conditions was described, and the optimal analytical conditions were determined through optimization experiments. The nitrate concentration in the range of 50-2000 μg / L showed a good linear relationship with the peak height. The detection limit was 3.5 μg / L and the relative standard deviation was 0.90% (n = 15,500 μg / L). The method was applied to the detection of nitrate in environmental water samples. The recoveries of spiked samples ranged from 95.0% to 100.2%. The method avoids the regeneration process of the cadmium reduction column, simplifies the operation and is easy to realize the unattended online automatic monitoring.