School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Int J Mol Sci. 2023 Aug 10;24(16):12629. doi: 10.3390/ijms241612629.
In order to accurately obtain photometric information of high concentration SO and other substances in the process industry, the spectroscopy behavior of SO, S, Ni and Cu in air and nitrogen atmosphere was compared based on the UV-visible spectrophotometer with a nitrogen replacing the oxygen. Different from Ni and Cu, the accuracy of SO and S in the ultraviolet region was effectively improved by using a nitrogen atmosphere (P detection results were regressed within the limited standard range, RE < 5%). The nitrogen atmosphere suppressed the additional light attenuation caused by its absorption of ultraviolet rays by isolating oxygen and was also reflected in the decrease in the degree of red shift of the characteristic wavelength for SO with increasing concentration. Therefore, the detection results of SO showed an effective improvement in sensitivity. Nevertheless, according to the complementary experimental results and theoretical calculations, in addition to oxygen absorption, the low detection accuracy of SO high concentration is also attributed to the reduction of the energy required for electronic excitation per unit group caused by the interaction between SO groups, resulting in a deviation of the C-A curve from linearity at high concentrations. The influence of this intermolecular force on the detection results is far more important than oxygen absorption. The research can provide reliable theoretical guidance and technical support for the pollution-free direct measurement of high-concentration solutions in the process industry and promote the sustainable development of the process industry.
为了准确获取过程工业中高浓度 SO 和其他物质的光度信息，基于采用氮气代替氧气的紫外可见分光光度计，比较了 SO、S、Ni 和 Cu 在空气和氮气气氛中的光谱行为。与 Ni 和 Cu 不同，氮气气氛有效地提高了紫外区 SO 和 S 的精度（P 检测结果在有限的标准范围内回归，RE<5%）。氮气气氛通过隔离氧气抑制了其对紫外线的额外光衰减，也反映在 SO 特征波长的红移程度随浓度增加而减小。因此，SO 的检测结果显示出灵敏度的有效提高。然而，根据补充的实验结果和理论计算，除了氧气吸收之外，SO 高浓度低检测精度还归因于 SO 基团之间相互作用导致单位基团电子激发所需能量的减少，导致在高浓度下 C-A 曲线偏离线性。这种分子间力对检测结果的影响远比氧气吸收重要。该研究可为过程工业中高浓度溶液无污染直接测量提供可靠的理论指导和技术支持，促进过程工业的可持续发展。
