HP-β-CD对紫外光谱法检测破乳剂复配体系中NP-40的抗干扰性能
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石油石化污染控制与处理国家重点实验室长江大学

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O657.32

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国家自然科学基金(41202111)、湖北省自然科学基金(2015CFB189)、中国石油创科技新基金(2019D-5007-0503)


Anti-interference performance of HP-β-CD for detection of NP-40 in demulsifier compound system by UV spectroscopy
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State Key Laboratory of Petroleum Pollution Control and Treatment,Yangtze University,Jingzhou

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    摘要:

    在十二烷基硫酸钠(SDS)与烷基酚聚氧乙烯醚(NP-40)组成的二元复配体系中,SDS能对NP-40的紫外光谱及临界胶束浓度(cmc)产生明显影响。虽然SDS在240 ~ 320 nm范围内无明显吸收峰,但是SDS能增强NP-40在275 nm处的吸光度。加入0.50 mmol×L-1 SDS后,0.25 mmol×L-1 NP-40的吸光度由0.345增加至0.378,增幅达9.6%。与此同时,SDS还能显著降低NP-40的表观cmc,当水溶液中SDS的浓度分别为0.20 mmol×L-1和0.50 mmol×L-1时,NP-40的表观cmc由0.237 mmol×L-1分别降低至0.227 mmol×L-1和0.224 mmol×L-1。研究结果表明,羟丙基-β-环糊精(HP-β-CD)能有效降低SDS对NP-40的紫外光谱产生的干扰,加入HP-β-CD后,0.25 mmol×L-1 NP-40及其在0.50 mmol×L-1 SDS溶液中的吸光度分别为0.379和0.381,与不添加HP-β-CD相比,吸光度变化幅度由9.6%降低至0.8%。研究结果还表明,HP-β-CD具有阻碍NP-40形成胶束的性能,NP-40形成胶束的ΔrGmθ随HP-β-CD浓度的增大而增加。按摩尔比1:1加入HP-β-CD后,紫外光谱法能够准确检测NP-40/SDS复配体系中NP-40的含量,回收率为99.09% ~ 100.00%。Job"s、FT-IR和1H-NMR的实验结果表明,NP-40进入HP-β-CD分子空腔进而形成了摩尔比为1:1型包结物,是HP-β-CD消除SDS对NP-40的紫外光谱干扰及破坏NP-40形成胶束的本因。

    Abstract:

    In the binary mixtures of sodium dodecyl sulfate (SDS) and alkylphenol ethoxylates (NP-40), SDS can significantly affect the UV spectrum and critical micelle concentration (cmc) of NP-40. Although SDS has no obvious absorption peak in the range of 240 ~ 320 nm, SDS can enhance the absorbance of NP-40 at 275 nm. After adding 0.50 mmol×L-1 SDS, the absorbance of 0.25 mmol×L-1 NP-40 increased from 0.345 to 0.378, an increase of 9.6%. At the same time, SDS could also significantly reduce the apparent cmc of NP-40, when the concentration of SDS in aqueous solution was 0.20 mmol.L-1 and 0.50 mmol.L-1, the apparent cmc of NP-40 decreased from 0.237 mmol×L-1 to 0.227 mmol.L-1 and 0.224 mmol.L-1, respectively. The results showed that hydroxypropyl-β-cyclodextrin (HP-β-CD) could effectively reduce the interference of SDS on the UV spectrum of NP-40. After HP-β-CD was added, the absorbances of 0.25 mmol.L-1 NP-40 and its absorbance in 0.50 mmol.L-1 SDS solution were 0.379 and 0.381, respectively. Compared with that without HP-β-CD, the absorbance change was reduced from 9.6% to 0.8%. The results also showed that HP-β-CD could hinder the formation of NP-40 micelles, and the ΔrGmθ of NP-40 micelles increased with the increase of HP-β-CD concentration. After HP-β-CD was added at the molar ratio of 1:1, the content of NP-40 in NP-40/SDS compound system could be accurately detected by UV spectrometry, the recovery rate was 99.09% ~ 100.00%. The experimental results of Job"s, FT-IR and 1H-NMR showed that NP-40 entered the cavity of HP-β-CD molecular and formed a 1:1 inclusion complex, which was the fundamental reason for HP-β-CD to eliminate the interference of SDS on the UV spectrum of NP-40 and destroy NP-40 to form micelles.

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  • 收稿日期:2022-01-10
  • 最后修改日期:2022-03-25
  • 录用日期:2022-03-28
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