2,4,6-三吡啶基三嗪显色分光测定水中铁含量  

Determination of Iron Content in Water by 2,4,6-Tris(2-pyridyl)-s-triazine Spectrophotometric Method

作　　者：孙璐瑶 李宇 江银枝[1] Sun Luyao;Li Yu;Jiang Yinzhi(Department of Chemistry, College of Science, Zhejiang Sci-Tech University, Hangzhou 310018, China)

机构地区：[1]浙江理工大学理学院化学系,浙江杭州310018

出　　处：《广东化工》2018年第11期233-234,共2页Guangdong Chemical Industry

基　　金：国家自然科学基金(21472174;21602201)

摘　　要：水体中铁含量地测定非常重要。研究了TPTZ分光光度法测定水中的铁含量。对测定波长、显色反应的pH值和金属离子的干扰进行了实验。绘制了工作曲线,测定了回收率,利用t法和F法评价了方法的准确性和精密性。利用加标法进行了自来水中铁含量的分析,直接法测定了废水中的铁含量。利用F法合t法评价了样品测定结果的准确性和精密性。结果显示显色pH=5,测定波长为598 nm,常见离子Cu^(2+),Zn^(2+),Pb^(2+),Ca^(2+),Mg^(2+),Mn^(2+)不干扰,Al3+的干扰用NH4F消除;工作曲线是y=0.452x+0.0063(R2=0.999),平均回收率为99.9%,RSD=0.40%,方法无系统误差,与邻二氮菲法无显著性差异。自来水中铁含量为0.051 mg/L,RSD=3.9%;废水中的铁含量8.66 mg/L,RSD=0.35%。The determination of iron content in water is very important. The TPTZ spectrophotometric method of determination of iron content in water is studied. The determination wavelength, the reaction pH value and interference of metal ions are investigated. The standard curve is established, the recovery is measured, and the precision and accuracy are evaluated by t method and F method. The iron content in running water was determined by standard addition method, and the iron content in waste water was determined by standard curve method. The results show that the the determination wavelength is 598 nm, the pH value is 5, it is no interference in the presence of Cu^2＋, Zn^2＋, Pb^2＋, Ca^2＋, Mg^2＋, Mn^2＋, interfere, and the interference of Al3＋ is eliminated by NH4 F. The standard curve is y=0.452 x＋0.0063 with R2=0.999, the average recovery is 99.9 %, the relative standard deviation is RSD=0.40 %, there are no systematic error and no significant difference between the TPTZ method and phenanthroline method. The iron content in running water is 0.051 mg/L with RSD=3.9 %, and the iron content in waste water is 8.66 mg/L with RSD=0.35 %.

关 键 词：分光光度法 三吡啶三嗪 铁含量分析 系统误差 显著性差异 

分 类 号：O655[理学—分析化学]