紫外分光光度法测定硝酸盐氮时消除铁离子干扰的新方法  

New Method for Eliminating the Iron Ions Interference in the Determination of Nitrate by UV Spectrophotometry

作　　者：孙艳芝[1] 李彩鹦[1] 万平玉[1] 李敏[1] 陈咏梅[1] 

机构地区：[1]北京化工大学理学院国家新危险化学品评估及事故鉴定基础研究实验室

出　　处：《光谱实验室》2011年第6期3143-3147,共5页Chinese Journal of Spectroscopy Laboratory

基　　金：中央高校基本科研业务费专项资金资助

摘　　要：在未受有机物污染的体系中,采用吸光度校正法可以准确快捷的消除铁离子的干扰。铁离子在220nm和275nm处都有吸收,而且这两个吸光度之间具有A220,Fe3+=3.8A275,Fe3+的线性关系。利用硝酸根在275nm处没有吸收,将A220,Fe3+从水样在220nm的吸光度值中扣除后即得到水样中硝酸盐氮的浓度。The interference of iron ions in the absence of organic pollution can be eliminate accurately and efficient by absorbance correction method.The iron ion absorbed at both of 220nm and 275nm which had the linear relationship of A220,Fe3＋=3.8A275,Fe3＋.The concentration of nitrate nitrogen was determined by deducting the A220,Fe3＋ from the absorbance value of water samples at 220nm due to that the nitrate did not absorb at 275nm.

关 键 词：硝酸盐氮 紫外分光光度法 铁离子 吸光度 

分 类 号：O657.32[理学—分析化学]