کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5746189 | 1618787 | 2017 | 8 صفحه PDF | دانلود رایگان |
- Iodinated X-ray contrast media (ICM) distribution in the waters of China was investigated.
- Relevance of ICM and I-DBPs in the surface water and DWTPs was investigated.
- Some ICM were strongly correlated with iodinated trihalomethanes (I-THMs).
- ICM were transformed to I-THMs during chlorination and ozonization processes in DWTPs.
- ICM was an important source for I-THMs formation in the real aquatic environment.
Distribution and relevance of iodinated X-ray contrast media (ICM) and iodinated disinfection byproducts (I-DBPs) in a real aquatic environment have been rarely documented. In this paper, some ICM were proven to be strongly correlated with I-DBPs through investigation of five ICM and five iodinated trihalomethanes (I-THMs) in surface water and two drinking water treatment plants (DWTPs) of the Yangtze River Delta, China. The total ICM concentrations in Taihu Lake and the Huangpu River ranged from 88.7 to 131 ng Lâ1 and 102-252 ng Lâ1, respectively. While the total I-THM concentrations ranged from 128 to 967 ng Lâ1 in Taihu Lake and 267-680 ng Lâ1 in the Huangpu River. Iohexol, the dominant ICM, showed significant positive correlation (p < 0.01) with CHClI2 in Taihu Lake. Iopamidol and iomeprol correlated positively (p < 0.01) with some I-THMs in the Huangpu River. The observed pronounced correlations between ICM and I-THMs indicated that ICM play an important role in the formation of I-THMs in a real aquatic environment. Characteristics of the I-THM species distributions indicated that I-THMs may be transformed by natural conditions. Both DWTPs showed negligible removal efficiencies for total ICM (<20%). Strikingly high concentrations of total I-THMs were observed in the finished water (2848 ng Lâ1 in conventional DWTP and 356 ng Lâ1 in advanced DWTP). Obvious transformation of ICM to I-THMs was observed during the chlorination and ozonization processes in DWTPs. We suggest that ICM is an important source for I-DBP formation in the real aquatic environment.
Journal: Chemosphere - Volume 184, October 2017, Pages 253-260