微乳液增敏PAR分光光度法测定油样中钴含量.pdfVIP

第47卷第3期 应 用 化 工 Vol.47 No.3 2018年3月 Applied Chemical Industry Mar.2018 微乳液增敏PAR分光光度法测定油样中钴含量 邓秀琴,王洪国,吴丽香 (辽宁石油化工大学 化学化工与环境学部,辽宁抚顺 113001) 摘 要:建立了用分光光度法直接测定油样中微量钴(Ⅱ)的方法。 在醋酸-醋酸钠缓冲体系中,以O/ W型微乳液 (十二烷基硫酸钠∶正丁醇∶正庚烷∶水=6∶12∶2∶80)为介质,以乙二胺四乙酸二钠(EDTA)溶液为掩蔽剂,以4-(2- 吡啶偶氮)-间苯二酚(PAR)为显色剂,钴(Ⅱ)与PAR形成稳定的橙红色络合物,其最大吸收峰位于514 nm处,其 4 表观摩尔吸光系数ε=5.31×10 L/ (mol ·cm)。 测定了大庆原油和油砂中的钴含量,结果表明,该方法灵敏度及 准确度高、选择性好,操作简单,非常适合推广应用。 关键词:微乳液;增敏;钴(Ⅱ);原油;油砂 中图分类号:TQ073.1 文献标识码:A 文章编号:1671-3206(2018)03-0618-03 Enhanced sensibility microemulsion PAR medium determination of cobalt(Ⅱ) in the oil samples by spectrophotometry DENGXiu-qin,WANGHong-guo,WULi-xiang (Department of Chemistry,Chemical Engineering and Environment,Liaoning Shihua University,Fushun 113001,China) Abstract:The direct spectrophotometric determination of trace cobalt(Ⅱ) in oil sampleswasestablished in acetic acid-sodium acetate buffer system,using the O/ W micro-emulsion(SDS∶n-C H OH∶n-C H ∶ 4 9 7 16 H O=6∶12∶2∶80) as the medium,and 4-(2-pyridylazo)-resorcinol(PAR) as chromogenic reagent,2 cobalt(Ⅱ)formed a stable orange-red complex with PAR,which had maximum absorption peak at 4 514 nm,itsapparent molar absorptivity wasε= 5.31×10 L/ (mol ·cm).The contentsof cobalt(Ⅱ)in Daqing crude oil and oil sand were determined.The results show that the method is highly sensitive and accurate,with good selectivity,simple to operate and easy to apply to practice. Key words:microemulsion;enhanced sensibility;cobalt(Ⅱ);base oil;oil sand 目前,随着开采出的原油趋向重质化和