流动注射分析法测定水样中的NO2--N和NO3--N

Determination of NO2--N & NO3--N in Water Samples by Flow Injection Analysis

关键词:  NO₂^--N  NO₃^--N  水样  流动注射分析法

Key words:  NO₂^--N  NO₃^--N  water sample  flow injection analysis

摘要:

采用流动注射技术测定水样中的NO₂^--N和NO₃^--N。以N-(1-萘基)乙烯二胺盐酸盐和对氨基苯磺酸为显色剂,在540 nm下比色测定NO₂^--N的含量。水样中的NO₃^--N,在稀醋酸条件下用锌粉将其预还原成NO₂^--N后,也在上述相同的条件下测定其含量。NO₂^--N的检出限为0.005×10^-6,NO₃^--N的检出限为0.05×10^-6,分析速度为65次/小时。

Abstract:

Flow injection analysis was used to detect the contents of NO₂^--N and NO₃^--N in water samples. The N-(1-naphthyl) ethylenediamine hydrochloride and p-aminobenzenesulfonic acid were used as chromogenic agents. The content of NO₂^--N was detected at 540 nm. The NO₃^--N in water samples was pre deoxidized to NO₂^--N by zinc powder under dilute acetic acid and then detected in the same condition. The detection limit of NO₂^--N is 0.005×10^-6,and the detection limit of NO₃^--N is 0.05×10^-6.The analysis speed is 65 times per hour.