二苯偶氮羰酰肼分光光度法测定油品中微量钒  

Spectrophotometric determination of trace vanadium in oils with diphenylcarbazone

作　　者：张起凯[1] 孔令照[1] 刘丙良[2] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]大庆石化公司化工二厂,黑龙江大庆163714

出　　处：《冶金分析》2005年第2期17-20,共4页Metallurgical Analysis

摘　　要：应用V(V)-二苯偶氮羰酰肼(DPCO)-CTMAB显色体系测定了油品中微量钒,考察了测定条件,建立了测定微量钒的新方法。络合物的最大吸收波长位于540nm,表观摩尔吸光系数为4 5×104。在25mL溶液中,钒含量在0～27 5μg范围内符合比尔定律。以盐酸羟胺和硫脲作掩蔽剂消除油品中Fe3+,Cu2+,Ni2+等干扰。实际油样分析结果的相对标准偏差不大于3 5%;加标回收率为95 8%～104 2%。方法简便、灵敏、准确,适用于油品中微量钒的测定。Vanadium (V) in oils was determined by spectrophotometry with V(V)-diphenylcarbazone (DPCO)-CTMAB system. Analytical conditions were investigated and a new method for the determination of trace vanadium in oils was developed. The maximum absorption lies in 540 nm and apparent molar absorption coefficient is 4.5 × 104 L·mol-1·cm-1. Beer's law is obeyed in the range of 0 - 27.5 μg/25 mL for vanadium. The disturbance of Fe3+, Cu2+, and Ni2+ can be eliminated by using hydroxy amino hydrochloric acid and sulfourea as masking agents. The relative standard deviations are less than 3.5% and the recoveries of oil sample are 95.8% - 104.2%. The results show that the method has high selectivity and accuracy, and can be applied to determining trace vanadium in oils.

关 键 词：二苯偶氮羰酰肼 分光光度法测定 微量钒 油品 表观摩尔吸光系数 最大吸收波长 相对标准偏差 Fe^3+ NI^2+ 加标回收率 显色体系 测定条件 比尔定律 盐酸羟胺 分析结果 络合物 钒含量 掩蔽剂 

分 类 号：TE622[石油与天然气工程—油气加工工程]