紫外分光光度法快速测定橡胶油中的芳烃
张卉,蔡烈奎
中海油炼油化工科学研究院,山东青岛 266500
Rapid determination of aromatic hydrocarbon in rubber oil by utraviolet spectrophotometry
张卉,蔡烈奎
CNOOC Research Institute of Refining and Petrochemicals, Qingdao 266500, China
摘要:建立快速分析橡胶油中芳烃含量的紫外分光光度法。在200~420 nm波长范围内橡胶油中的芳烃有吸收峰,经优化试验确定用环己烷稀释橡胶油样品,测定260~420 nm之间的吸收峰面积。芳烃含量在2.56~8.97 μg/g范围内与吸收峰面积线性关系良好,线性相关系数为0.9997,芳烃检出限为0.053 μg/g,定量限为0.159 μg/g。橡胶油溶液样品6次平行测定结果的相对标准偏差为0.79%,3水平加标平均回收率在85.3%~96.4%之间。用该方法与质谱法对同一橡胶油样品中的芳烃含量进行测定,两种方法测定结果的相对偏差在±5%以内。紫外分光光度法精密度、准确度高,易操作,可以快速分析橡胶油中的芳烃含量。
Abstract:A method for analysing aromatics content in rubber oil by ultraviolet spectrophotometry was established. In the wavelength range of 200-420 nm, the aromatics in rubber oil had absorption peak. Rubber oil was diluted with cyclohexane, then the absorbance peak area in the wavelength gange of 260-420 nm was measured. The experimental results showed that there was good linear relationship between the content of aromatics and the absorption peak area in the range of 2.56-8.97 μg/g with the linear correlation coefficient of 0.9997. The detection limit of aromatic was 0.053 μg/g, and the quantification limit was 0.159 μg/g. The relative standard deviation of rubber oil detection results was 0.79%(n=6).The average recoveries rate of three level adding standard were 85.3%-96.4%. The aromatics content of the same rubber oil samples was determined by this method and mass spectrometry, the relative deviation of the two methods results was within±5%. Ultraviolet spectrophotometry which is easy to operate has high precision and accuracy, and it can be used for analysing aromatics content in rubber oil rapidly.
关键词:紫外分光光度法;吸光度;橡胶油;芳烃含量;环己烷
Keywords:ultraviolet spectrophotometry; absorbance; rubber oil; aromatic content; cyclohexane
本文引用格式:
张卉,蔡烈奎.紫外分光光度法快速测定橡胶油中的芳烃[J].化学分析计量,2018,27(3):82-85.
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