摘要
针对本实验室原有测定NO3-N方法的线性范围窄且浓度极低,难以实现对皮革废水等含NO3-N浓度高的水样直接测定的缺点,对其进行改进后,成功建立了在线稀释-流动注射分光光度法,直接测定水样中NO3-N的方法。方法在0.2～10mg·L-1范围内NO3-N浓度与峰高成良好线性关系,相关系数r=0.9991,检出限为0.068mg·L-1,相对标准偏差分别为0.67%(500μg·L-1NO3-N,n=8)。样品测定频率为22个样/h。该法简单、快速,在无需对试样进行稀释前处理的基础上能实现对水样的直接测定,有利于实现废水的在线现场检测。实际水样加标回收率为93.4%～108.9%,结果令人满意。
With respect to the limitation of the narrow range of linear response and low concentration detection capacity of previous method in our laboratory which imposed difficulty to directly determinate high concentration of NO3 - N in tannery effluent, etc., certain improvements were made and a on -line dilution -flow injection spectrophotometry was implemented here to determine NO3 - N in water samples. The linear range was from 0.2 to 10mg · L^-1 of standard solutions （ correlation coefficient r =0. 9991 ）. The detection limit was 0. 068mg · L^-1. The relative standard deviation （RSD） was 0.67% （ n = 8 ） obtained by injecting a standard NO3 - N solution of 500μg · L^-1. The sampling rate was 22 h^-1. The method succeeded to determinate NO3 - N in varied water samples with recovery percentages ranging from 93.4% to 108.9% , which was ideal. Because of its simplicity, rapidity and directly realization the detection of water samples without pre - dilution, on - line determination of waste waters was feasible.
出处
《中国皮革》
CAS
北大核心
2008年第13期30-32,共3页
China Leather
基金
国家863课题"营养盐自动分析系统标准化"(项目编号:200410)
