铬天青S分光光度法测定原油中微量铜  

Spectrophotometric Determination the Micro-Copper in Crude Oil With CAS as a Colored Indicator

作　　者：沈春玉[1] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001

出　　处：《辽宁石油化工大学学报》2008年第3期23-25,共3页Journal of Liaoning Petrochemical University

摘　　要：以铬天青S为显色剂,用分光光度法测定原油中的微量铜,并考察了样品灰化条件和测定条件。在650℃将样品灰化4.5h以上条件下,用HNO3溶液溶解灰分中的铜,使干扰离子与铜分离。在波长610nm、表观摩尔吸光系数ε=8.32×104L/(mol.cm),其线性范围为0～8μg,合成样回收率98.04%,原油测定结果的相对标准偏差4.11%,结果表明,该方法准确、简便、不需分离、灵敏度高。The determination of micro cooper in crude oil samples by spectrophotometer with chrome azurol S（CAS） as a colored indicator has been developed. The cineration of samples and measuring conditions were studied. After samples burning to ashes at 650℃ for at least 4.5 h. Cu in the ash was dissolute by HNO3 solution to separate interference ions. The molar absorption coefficient ε610 nm is 8.32×10^4L/（mol·cm）. The linear range is between 0-8μg. The recovery rate of the artificial synthetic sample is 98.04%, and the actual crude oil was analyzed with RSD of the results 4.11%. This method offers the advantages such as good accuracy, ease of operation, no need for separation and high sensitivity.

关 键 词：铬天青 铜 原油 分光光度法 

分 类 号：O657.32[理学—分析化学]