微波消解/流动注射光度法在线测定水中的总氮  

On-line Determination of Total Nitrogen in Water by Microwave Digestion and Flow Injection-spectrophotometry

作　　者：苏苓[1] 张海涛[1] 王庆霞[1] 

机构地区：[1]徐州建筑职业技术学院基础部,江苏徐州221008

出　　处：《中国给水排水》2007年第4期76-78,共3页China Water & Wastewater

基　　金：江苏省高校自然科学基金资助项目(05KJD150219);徐州建筑职业技术学院青年科研基金资助项目(JYA304-06)

摘　　要：利用微波在线消解水样,将流动注射分析技术与分光光度法相结合,建立了一种在线测定水中总氮的快速分析方法。在优化试验条件下,该方法对TN的检出限为0.04 mg/L,对总氮含量为0.491 mg/L的标准样品测定11次的相对标准偏差为1.2%。采用该方法测定河水、生活污水、工业废水水样中的TN含量,其相对标准偏差≤1%,加标回收率为97%-101%,结果令人满意。A rapid method for determination of total nitrogen in water by on-line microwave digestion and flow injection-spectrophotometry was established. Effects of concentration of reagents and other conditions were optimized. A detection limit of 0.04 mg/L total nitrogen is achieved. The relative standard deviation is 1. 2% for the determination of a reference water sample of 0.491 mg/L total nitrogen （ n = 11 ）. The proposed method is successfully applied to the analyses of several samples of river water, domestic wastewater and industrial wastewater, with relative standard deviations of less than 1.0% and recoveries of 97% to 101% by the standard addition method.

关 键 词：微波消解 流动注射 总氮 

分 类 号：X832[环境科学与工程—环境工程]