摘要
本文介绍了在pH=1.4的KCl-盐酸缓冲溶液中,以5-Br-PADAP为显色剂,用三阶导数分光光度法直接测定原油及渣油中微量铁的方法。本法不加掩蔽剂,利用导数分光光度法具有的抗干扰及高分辨的优点可以消除镍和钒的严重干扰。本法简单、灵敏、准确,在0～26μg/25ml范围内服从比耳定律。经对样品的多次测定和回收实验表明:本法标准偏差小于0.45ppm:相对标准偏差小于5％;回收率为99～109％,与等离子体法测定结果接近,符合测定要求。
A new method of determining iron in crude oil and residua] oil with third order derivative spec t rophotome try was investigated with 5-Br-PADAP as chromogenic reagent in pH= 1.4 KC1-HCl buffer solution. The experimental results showed the advantages of high accuracy, elimination of interference by nickel and vanadium.The method was simple and sensitive, its measurements obeyed Beer's law in the iron concentration range of 0.26μg/25mL. It s standard deviation was less than 0.45 ppm, relative standard deviation less than 5%. recovery 99-09%. The results were in good agreement with those obtained with ICP-AES.
出处
《石油大学学报（自然科学版）》
CSCD
1989年第6期107-111,共5页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
导数
分光光度法
原油
渣油
铁
Derivative spectrophotometry
Third order Derivative Speetroscopy
Crude oil
Residual oil
Iron
Determination
