Qualitative And Quantitative Analysis Of Polycyclic Aromatic Hydrocarbons Based On Three Dimensional Fluorescence Spectroscopy

Polycyclic aromatic hydrocarbons(PAHs)are organic pollutants.Their chemical structures are two or more benzene rings,which are generally present in trace amounts in water.The greatest harm of these organic pollutants is the production of light-induced poisoning effects.Therefore,organic pollution detection technologies such as PAHs have become a hot topic for environmental protection workers.This article describes the fluorescence generation process,the influence of molecular structure on fluorescence,the influence of environmental factors on fluorescence,the relationship between the fluorescence intensity of the material and the concentration of the solution,the feasibility of fluorescence detection of PAHs,the type and structure of fluorescence detection instruments,and the introduction of several Commonly used evaluation performance indicators.Six PAHs were selected as the target analytes in the experiment.They were lanthanum,cerium,naphthalene,anthracene,phenanthrene,and fluoranthene.The experimental materials and sample preparation were introduced,and then the spectral data were preprocessed(de-scattering,excitation-emission calibration,spectral data compression).The experiment uses naphthalene,acenaphthene,and Fluorene as measurement samples.The two-order correction algorithms of Alternate Penalty Trilinear Decomposition(APTLD)and Self-Weighted Alternating Trilinear Decomposition(SWATLD)have second-order advantages and can be used in unknown interference or background.Mathematical separation" instead of "chemical separation." On the basis of three-dimensional fluorescence spectroscopy,APTLD and SWATLD were used to analyze the pre-processed spectral data.In the PAHs fluorescence spectrum overlap and interference coexistence,the two algorithms can still be accurately measured.Four-dimensional arrays of two kinds of polycyclic aromatic hydrocarbons,naphthalene and anthracene,in different solvents were analyzed by the Alternating Penalized Quadratic Decomposition(APQLD)algorithm.The second-order correctionalgorithm was compared.The experimental results showed the advantages of the third-order correction algorithm.The AWRATLD algorithm was used to analyze four-dimensional data arrays constructed from three PAHs with humic acid interferences,including phenanthrene,anthraquinone,and fluoranthene,which were synthesized by lake water.Because humic acid has a annihilation effect,Correct the concentration score.The experimental results show that,even in the lake water containing humic acid interference,the use of third-order correction algorithm can still accurately determine the polycyclic aromatic hydrocarbons.