Shuang Xue, Siyu Zhao, Xuefeng Guan, Chao Wang, Zhonglin Chen, Qiang Liu
School of Environment
Abstract
This study investigated the photodegradation of transphilic acid (TPI-A) in ice under natural solar radiation, as well as the effect of various environmental factors, such as pH, salinity, the concentrations of iron (Fe), nitrate (NO3 –), and original dissolved organic carbon (DOC) concentration, on the content, spectroscopic characteristics and chlorine reactivity of TPI-A in ice in the photodegradation process. TPI-A was isolated using XAD resins from water samples collected from the Hunhe River in Liaoning Province, China. The results showed, that in the photodegradation process of TPI-A in the ice, compared with neutral conditions, both acidic and alkaline conditions accelerated DOC and ultraviolet (UV) absorbance at 254 nm (UV-254) removal rates. High pH conditions effectively accelerated the photodegradation of fluorescent materials and trihalomethane (THM) precursors in TPI-A. The salinity inhibited the photodegradation of UV-absorbing compounds, THM precursors, and aromatic protein-like, fulvic acid-like, and soluble microbial byproduct-like (SMP-like) fluorescent materials in TPI-A. The influences of Fe concentration over the photodegradation of TPI-A and total fluorescent materials in it were small. NO3 – accelerated the photodegradation of TPI-A while it had an inhibition effect over five types of fluorescent materials in TPI-A. The lower the initial DOC concentration was, the higher the photodegradation rates TPI-A and THM precursors in it.
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52-Effects of various factors on photodegradation-induced changes in spectroscopic characteristics and chlorine reactivity of transphilic acid in ice.pdf
