简化分光光度法测定SBS中结合苯乙烯含量

Simplified Spectrophotometric Method for Determining the Content of Bound Styrene in SBS

本文论述了用简化分光光度法测定SBS中结合苯乙烯含量方法的可行性。以CH_(3)Cl_(2)作为溶剂溶解样品,在260nm波长扫描检测,记录样品吸光度。试验表明样品吸光度与结合苯乙烯含量(PS%)呈线性关系,可用校准曲线定量分析。分别采用单标样-双标准曲线拟合法以及混合标样-单标准曲线法来制作校准曲线。两种方法结果相一致。选用混合标液-单标准曲线法,简化工作流程。试验中,经过准确度测试,加标回收率为98.31%~104.55%;相对标准偏差为0.45%。检测步骤简便快捷,是较好地检测SBS中结合苯乙烯含量的方法,可在实际工作中推广使用。

This article discusses the feasibility of using a simple spectrophotometric method to determine the content of bound styrene in SBS.Dissolve the sample with CH_(3)Cl_(2) as the solvent,scan and detect at a wavelength of 260 nm,and record the absorbance of the sample.The experiment reveals there is a linear relationship between the absorbance of the sample and the content of bound styrene(PS%),which can be quantitatively analyzed using a calibration curve.Use the single standard double standard curve fitting method and the mixed standard single standard curve method respectively to create calibration curves.The results of the two methods are consistent.Select the mixed standard solution single standard curve method to simplify the workflow.In the experiment,after accuracy testing,the recovery rate of spiking was 98.31%~104.55%;the relative standard deviation is 0.45%.The detection steps are simple and fast,and it is a good method for detecting the content of styrene in SBS,which can be promoted and used in practical work.