title: Determination of Polycyclic Aromatic Hydrocarbons in the Presence of Humic Acid in water.
abstract: The presence of humic acid (HA) makes it extremely difficult to determine and quantify accurately polycyclic aromatic hydrocarbons (PAHs) in aquatic environment because of their complex and strong interaction. To solve this problem, a new method was developed in this work through the combination of PARAFAC and fluorescence spectroscopy, which mainly includes: (1) the fluorescence quantum yield acquisition of PAHs with and without HA by PARAFAC; (2) the  concentration score correction of PAHs in validation and test sets using the fluorescence quantum yields; and (3) the prediction of PAHs concentration in the validation and test sets in the presence of HA by corrected concentration. Using this method, the PAHs concentration on the level of µg L(-1) in the test samples with HA of 2.5 mg/L and 5.0 mg/L can be successfully predicted with the root mean square error below 0.15 µg L(-1), relative error of prediction below 4% for validation samples, recoveries of each PAH between 82.5% and 102.6% for test samples.
authors.affiliation: Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China University of Science and Technology of China, Hefei, China.
authors.forename: Ruifang
authors.initials: R
authors.lastname: Yang
authors.affiliation: Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China njzhao@aiofm.ac.cn.
authors.forename: Nanjing
authors.initials: N
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Xiao
authors.affiliation: School of Mathematics and Statistics, Hefei Normal University, Hefei, China.
authors.forename: Shaohui
authors.initials: S
authors.lastname: Yu
authors.affiliation: Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.affiliation: Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, China.
authors.forename: Wenqing
authors.initials: W
authors.lastname: Liu
keywords: PARAFAC; Polycyclic aromatic hydrocarbons; fluorescence; humic acid; parallel factor analysis; quencher