羟丙基-β-环糊精修正紫外光谱法-电导率法定量分析表面活性剂复配体系组分  

Quantitative Analysis of Surfactant Complex System by HP-β-CD Modified UV Spectrometry Combined with Conductivity Method

作　　者：杨帼君 姜怡 石东坡[1] 王渊 孙建萧 朱生华 田明磊 李赓 YANG Guojun;JIANG Yi;SHI Dongpo;WANG Yuan;SUN Jianxiao;ZHU Shenghua;TIAN Minglei;LI Geng(State Key Laboratory of Petroleum Pollution Control(Yangtze University),Jingzhou,Hubei 434023,P R of China;Downhole Service Company of Xibu Drilling Engineering Company Limited,CNPC,Karamay,Xinjiang 834000,P R of China)

机构地区：[1]石油石化污染控制与处理国家重点实验室(长江大学),湖北荆州434023 [2]中国石油集团西部钻探工程有限公司井下作业公司,新疆克拉玛依834000

出　　处：《油田化学》2024年第4期718-724,共7页Oilfield Chemistry

基　　金：国家自然科学基金“烷基苯磺酸盐激发光谱法定量研究”(项目编号41202111);中国石油科技创新基金“电氧化联合电絮凝深度处理胍胶压裂返排液技术研究”(项目编号2019D-5007-0503);中国石油集团公司西部钻探工程有限公司资助项目“2023-2024年井下作业公司XZ-WnF压裂流体性能在线监测装置研制”(项目编号2023XZ204)。

摘　　要：辛基酚聚氧乙烯醚(OP-20)与十二烷基硫酸钠(SDS)是油田后期开采中常用的复配表面活性剂。为了准确检测OP-20/SDS二元复配体系中各组分的含量,以羟丙基-β-环糊精(HP-β-CD)作为掩蔽剂,利用其外亲水、内疏水的特殊结构,以及自发包结芳香族表面活性剂的特性,修正紫外光谱法用于检测二元复配体系中OP-20的含量;同时,用电导率法定量分析二元复配体系中的SDS,研究了OP-20对检测结果的影响。结果表明,采用紫外光谱法检测二元复配体系中OP-20的含量时,SDS会对OP-20的吸光度和临界胶束浓度(C_(cmc))产生干扰。在0.2 mmol/L OP-20水溶液中加入0.4 mmol/L SDS,OP-20在最大吸收波长224 nm处的吸光度由1.727增至1.751;在0.4 mmol/L SDS水溶液中,OP-20的C_(cmc)由纯水中的0.223 mmol/L降至0.198 mmol/L。HP-β-CD对紫外光谱法检测二元复配体系中的OP-20具有显著的掩蔽作用,HP-β-CD与OP-20按物质的量比1∶1进行包结,阻断了OP-20分子和SDS分子之间的相互干扰。加入HP-β-CD后,二元复配体系中OP-20的回收率由96.42%~106.92%变化至99.28%~101.38%,用紫外光谱法检测复配体系中OP-20含量的准确度明显提高。HP-β-CD消除SDS和OP-20之间相互干扰的原因为OP-20分子从宽、窄两个口径方向进入HP-β-CD分子空腔并形成包结物。采用电导率法可准确检测二元复配体系中SDS的含量,OP-20不会对SDS产生干扰。当溶液中OP-20的浓度为0.1~0.3 mmol/L时,二元复配体系中SDS的回收率为100.83%~101.92%。HP-β-CD修正紫外光谱法联合电导率法能有效检测OP-20/SDS表面活性剂二元复配体系中各组分的含量。Octylphenol polyoxyethylene ether(OP-20)and sodium dodecyl sulfate(SDS)are commonly used surfactants in the later stage of oilfield exploitation.In order to accurately detect the content of each component in OP-20/SDS binary complex system,hydroxypropyl-β-cyclodextrin(HP-β-CD)was used as a masking agent to modify the UV spectroscopy and then detect the content of OP-20 in binary complex system by using its special structure of external hydrophilicity and internal hydrophobicity,as well as the characteristics of spontaneous inclusion of aromatic surfactants.At the same time,the conductivity method was used to quantitatively analyze the SDS in binary complex system,and then the effect of OP-20 on the test results was studied.The results showed that SDS could interfere with the absorbance and critical micelle concentration(C_(cmc))of OP-20 when the content of OP-20 in binary complex system was detected by UV spectroscopy.When 0.4 mmol/L SDS was added to 0.2 mmol/L OP-20 aqueous solution,the absorbance of OP-20 at the maximum absorption wavelength of 224 nm increased from 1.727 to 1.751.In 0.4 mmol/L SDS aqueous solution,the C_(cmc) of OP-20 decreased from 0.223 mmol/L in pure water to 0.198 mmol/L.HP-β-CD had a significant masking effect on the detection of OP-20 in binary complex system by UV spectroscopy.HP-β-CD and OP-20 were encapsulated at a molar ratio of 1∶1,which blocked the mutual interference between OP-20 molecules and SDS molecules.After adding HP-β-CD,the recovery rate of OP-20 in binary complex system changed from 96.42%—106.92%to 99.28%—101.38%.As a result,the accuracy of detecting OP-20 content in complex system by UV spectroscopy was significantly improved.The reason why HP-β-CD eliminated the mutual interference between SDS and OP-20 was that OP-20 molecules entered the HP-β-CD molecular cavity from both wide and narrow aperture directions and then formed an inclusion complex.The conductivity method could accurately detect the content of SDS in binary complex system,while OP-20 would n

关 键 词：羟丙基-Β-环糊精 表面活性剂 定量分析 紫外光谱法 电导率法 

分 类 号：O657.32[理学—分析化学] O657.11[理学—化学]