Determination of Nitrite Nitrogen in Fresh Water with Modified Hexavalent Chromium Channel of Continuous Flow Analyzer
The hexavalent chromium determination module of the SEAL continuous flow analyzer was modified for the determination of nitrite nitrogen content in water.The experimental results showed that the standard curve had:good linearity;low detection limit,meeting the requirements for detection limit in environmental quality standard;high precision and good repeatability,with a relative standard deviation of 0.056％to 0.25％;high accuracy,with certified reference materials ensuring a range of values and a relative error of-0.70％to-2.81％;and the recovery rate of spiking between 89.0％and 104％.In addition,compared with traditional manual spectrophotometry,there is no significant difference in the measurement results between the two methods.To sum up,the method used in this study to determine nitrite nitrogen in freshwater is featured by high automation,fast analysis speed,high sensitivity,low detection limit,good instrument stability,low reagent consumption,and low environmental pollution.It has obvious advantages in large-scale sample analysis.
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