Impacts of haze on the photobleaching of chromophoric dissolved organic matter in surface water

Tong，Ganghui1; Yang，Xueling1; Li，Yun1; Jin，Meng1; Yu，Xubiao1; Huang，Ying1; Zheng，Rongyue1; Wang，Jun Jian2,3; Chen，Huan4,5

2022-09-01

10.1016/j.envres.2022.113305

ENVIRONMENTAL RESEARCH   影响因子和分区

0013-9351

1096-0953

Sunlight plays an important role in the photochemical processes of chromophoric dissolved organic matter (CDOM), which is closely related to water self-purification and primary productivity of healthy aquatic ecosystem health. The fine particles of haze, a widespread air pollutant, absorb natural ultraviolet (UV) irradiation and have an unknown degree of influence on the photochemical transformation of CDOM. Here, an in-situ experiment investigating how the amount and composition of CDOM changes under hazy conditions was conducted in Ningbo, southeastern China, a city that frequently suffers from seasonal haze pollution. The results indicated that haze attenuated UV light under different weather conditions. The UV intensities were reduced from 1124.90 ± 91.58 to 510.26 ± 40.26 μW cm and 748.54 ± 101.68 to 316.32 ± 40.48 μW cm on sunny and cloudy days, respectively; these values approached those on rainy days (186.97 ± 28.58 μW cm). Consequently, the loss of dissolved organic carbon during the irradiation test was reduced on hazy days (e.g., from 5.63% to 2.59% on sunny/hazy days). The impact of haze on CDOM photobleaching was further assessed by an excitation-emission matrix (EEM) combined with parallel factor (PARAFAC) analysis. On hazy days, the EEM-PARAFAC components were saved from photobleaching to different degrees; and humic-like substances showed a stronger protective effect from haze than protein-like substances because of their higher photosensitivity. Consequently, haze could cause more terrestrial CDOM to remain in surface water. UV intensity played a critical role in the composition characteristics of CDOM. This study identifies the linkage between atmospheric pollution and water quality and demonstrates that long-term and large-scale haze may adversely influence aquatic ecology through pollutant/nutrient accumulation.

Air pollution Dissolved organic matter Photochemistry Water quality

SCI

英语

其他

National Natural Science Foundation of China[41977152];Natural Science Foundation of Zhejiang Province[LGF19E090006];

Environmental Sciences & Ecology ; Public, Environmental & Occupational Health

Environmental Sciences ; Public, Environmental & Occupational Health

WOS:000793470800003

ACADEMIC PRESS INC ELSEVIER SCIENCE

ENVIRONMENT/ECOLOGY

2-s2.0-85128343428

Scopus

1.School of Civil and Environmental Engineering,Ningbo University,Ningbo,315211,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Biogeochemistry & Environmental Quality Research Group,Clemson University,29442,United States
5.Department of Environmental Engineering and Earth Science,Clemson University,29634,United States

Tong，Ganghui,Yang，Xueling,Li，Yun,et al. Impacts of haze on the photobleaching of chromophoric dissolved organic matter in surface water[J]. ENVIRONMENTAL RESEARCH,2022,212.

Tong，Ganghui.,Yang，Xueling.,Li，Yun.,Jin，Meng.,Yu，Xubiao.,...&Chen，Huan.(2022).Impacts of haze on the photobleaching of chromophoric dissolved organic matter in surface water.ENVIRONMENTAL RESEARCH,212.

Tong，Ganghui,et al."Impacts of haze on the photobleaching of chromophoric dissolved organic matter in surface water".ENVIRONMENTAL RESEARCH 212(2022).