摘要
建立了双波长光度法——Fe（Ⅱ）-TAB—NO2-显色光度法测定水中的微量铁。在碱性介质中，铁（Ⅱ）与硫代巴比妥酸-NO2-体系友生显色反应形成-种蓝色配阴离子，该配阴离子具有两个吸收峰分别位于658nm和384nm，且体系的吸光度A658、A384及其二者之和A均与铁（Ⅱ）含量在0—30μg／（25mL）范围内具有良好的线性关系。方法的加标回收率为94％～104％，测定结果的相对标准偏差为3．4％～4．8％（n=5）。
Determination of iron in water was established by the dual - wavelength spectrophotometry with thibarbiurie acid - NO2 -. In alkalescence base medium, iron（ Ⅱ ）reacted with thibarbiuric acid - NO2 to form a blue complex anion with two absorption peaks at 658 nm and 384 nm, respectively. The absorbance blue complex anion at 658 nm（A658 ） and 384 nm（A384 ） and A（A =A658 ＋ A384 ） had better linear relationship in the range of 0 - 30.0 μg/（25 mL）. The recoveries were 94% - 104% , and the RSD was 3.4% -4.8%（n =5）.
出处
《化学分析计量》
CAS
2008年第6期52-54,共3页
Chemical Analysis And Meterage
关键词
铁
硫代巴比妥酸
双波长光度法
配阴离子
iron, thibarbituric acid, dual - wavelength spectrophotometry, complex anion
