水杨基荧光酮分光光度法测定聚乙烯中微量铝  

Determination of Trace Aluminum in Polyethylene by Salicyl Fluorone Spectrophotometry

作　　者：张威[1] 

机构地区：[1]中国石油抚顺石化公司合成洗涤剂厂,辽宁抚顺113004

出　　处：《当代化工》2015年第7期1614-1617,共4页Contemporary Chemical Industry

摘　　要：以Al-水杨基荧光酮-聚乙烯醇-土温-60为显色体系,用分光光度法测定聚乙烯中的微量铝。在实验的过程中需要对测量的条件进行考察。实验结果表明波长560 nm处产生最大吸收。铝量1.0-5.0μg/25 mL符合比尔定律,摩尔吸光系数ε=0.845×105 L/（mol·cm）,得线性回归方程是A=0.08126×106 C＋0.008637（C的单位mo1/L）。样品中存在多种微量元素,它们对聚乙烯中铝的测定存在干扰。用柠檬酸三钠作掩蔽剂,消除了干扰离子。人工合成样品的回收率在100.2%-100.5%,它们的平均回收率为100.3%,相对偏差为0.3%。对聚乙烯中铝含量进行测定回收率在96.1%-102.5%,平均加标回收率是100.1%,其相对偏差RSD为1.8%。本文所用的方法选择性好、准确度好、灵敏度高、实用性强。它是一种快速、有效测定聚乙烯中微量铝的方法并且在实际应用中具有一定的意义和价值。Aluminum-salicyl fluoronl-PVA-TWeen-60 coloured system was used to determine trace aluminum in polyethylene by spectrophotometry.In the course of the experiment,the measuring conditions were studied.The experiment results indicate that the absorbance of the complex at 560 nm is the maximum absorption wavelength.The molarabsorption coefficient is 0.845×105 L/（mol·cm）,linear range is 1.0-5.0 μg/25 mL.The regression line equation is A= 0.08126×106 C ＋0.008637（C,mol/L）.There are amount of trace elements in the samples, such as Ti4＋、 Cr6＋、Mn7＋、Cu2＋、Ni2＋、Fe3＋、Zn 2＋ and V5＋,which can interfere determination of aluminum in polyethyle.The sodium citrate can be used as masking agent to mask interfering ions during the course of determination.The recovery rate of synthetic sample is 100.2%-100.5%. The average recovery rate is 100.3%. The relative standard deviation is 0.3%.The recovery rate of samples of aluminum in polyethylene is 96.1%-102.5%. The average recovery rate is 100.1%.The relative standard deviation is 1.8%. This analysis method has the characteristics of high selectivity,accuracy and sensitivity. It is a rapid and efficient method to determine aluminum in polyethylene.

关 键 词：水杨基荧光酮 分光光度法 聚乙烯 铝 

分 类 号：O657[理学—分析化学]