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Study on the shift of ultraviolet spectra in aqueous solution with variations of the solution concentration
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2020-03-16 , DOI: 10.1016/j.saa.2020.118259
Angxin Tong , Xiaojun Tang , Feng Zhang , Bin Wang

In this study, we mainly focused on predictable regularities of the red shift of ultraviolet spectra for β-phenylethylamine (PEA), NaCl and NaOH in aqueous solution. The absorption peaks of the UV spectra near 191 nm of NaCl, NaOH and PEA in aqueous solution moved in the direction of a red shift while the molar absorption coefficient at the peak increased regularly with the increasing solution concentration. These shifts were obtained for solutions with concentrations ranging from 3.68 to 1000 mmol/L for NaCl, from 0.762 to 2000 mmol/L for NaOH, and from 0.0515 to 8.91 mmol/L for PEA. The plots of the logarithm of the solution concentration for NaCl and PEA versus the absorbance at 191 nm and at the peak were linear, and the plots of the logarithm of the solution concentration for NaCl and PEA versus the wavelength at the peak (shifted from 191 nm) were also linear. In addition, the plots of the logarithm of the solution concentration for NaOH that ranged from 0.762 to 1.96 mmol/L versus the absorbance at 191 nm and at the peak were linear as well as the plots of the logarithm of the solution concentration for NaOH that ranged from 1.96 to 2000 mmol/L versus the wavelength at the peak. The slopes of the absorbance at 191 nm of PEA, NaCl and NaOH were somewhat similar to the absorbance at the peak separately, whereas the slopes of the wavelengths at the peak were different from them. Finally, in order to obtain the predictable regularity of the red shift of the UV spectrum for the mixture, 22 ternary mixtures were prepared. The results indicate that the inhibiting effect of hydroxide ions (OH-) caused the wavelength near 206 nm to remain unchanged when the solution concentration of NaOH in the mixture was more than 0.762 mmol/L.



中文翻译:

溶液浓度变化对水溶液中紫外光谱的影响

在这项研究中,我们主要关注水溶液中β-苯乙胺(PEA),NaCl和NaOH的紫外光谱红移的可预测规律。水溶液中NaCl,NaOH和PEA的191 nm附近的UV光谱的吸收峰向红移方向移动,而该峰处的摩尔吸收系数随溶液浓度的增加而规则地增加。对于NaCl浓度范围为3.68至1000 mmol / L,NaOH浓度范围为0.762至2000 mmol / L,PEA浓度范围为0.0515至8.91 mmol / L的溶液,获得了这些变化。NaCl和PEA的溶液浓度对数与191 nm和峰值处的吸光度的关系图呈线性,NaCl和PEA溶液浓度的对数与峰值波长(从191 nm偏移)的关系也呈线性关系。此外,NaOH溶液浓度的对数范围为0.762至1.96 mmol / L,与191 nm和峰值处的吸光度呈线性关系,NaOH溶液浓度的对数范围为线性。相对于峰值波长范围为1.96至2000 mmol / L。PEA,NaCl和NaOH在191 nm处的吸光度斜率分别类似于峰值处的吸光度,而峰值处的波长斜率与此不同。最后,为了获得混合物的UV光谱红移的可预测规律性,制备了22种三元混合物。

更新日期:2020-03-16
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