Composition of dissolved organic matter controls interactions with La and Al ions: Implications for phosphorus immobilization in eutrophic lakes

2019 ◽  
Vol 248 ◽  
pp. 36-47 ◽  
Author(s):  
Yingxun Du ◽  
Qiaoying Zhang ◽  
Zhengwen Liu ◽  
Hu He ◽  
Miquel Lürling ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Eutrophic Lakes ◽  
Phosphorus Immobilization

scholarly journals Heavy-metal pollution alters dissolved organic matter released by bloom-forming Microcystis aeruginosa

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18421-18427 ◽  
Author(s):  
Haiming Wu ◽  
Li Lin ◽  
Guangzhu Shen ◽  
Ming Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microcystis Aeruginosa ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Aquatic Ecosystems ◽  
Eutrophic Lakes

The risk of heavy metals to aquatic ecosystems was paid much attention in recent years, however, the knowledge on effects of heavy metals on dissolved organic matter (DOM) released byMicrocystiswas quite poor, especially in eutrophic lakes.

scholarly journals Photochemical degradation characteristics of alga-sourced dissolved organic matter in Chaohu Lake, China

2020 ◽  
Vol 20 (8) ◽  
pp. 3083-3095
Author(s):  
Guolian Li ◽  
Lu Li ◽  
Kang Song ◽  
Zhiwei Yuan ◽  
Shuguang Zhu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Algal Blooms ◽  
Chaohu Lake ◽  
Order Kinetic ◽  
Photochemical Degradation ◽  
Dark Condition ◽  
Eutrophic Lakes ◽  
Uv C

Abstract Abundant algae-sourced dissolved organic matter (A-DOM) is produced during algal blooms in eutrophic lakes. Natural-light-driven photodegradation plays an important role in A-DOM function and its migration in aqueous systems. The photodegradation performance of A-DOM extracted from Chaohu Lake was tested and characterized under UV-A, UV-C irradiation, and dark condition, and the photochemical degradation characteristics and molecular weight changes of A-DOM during degradation were analyzed. A-DOM mainly includes four EEM-PARAFAC components, namely, C1 (protein-like tryptophan), C2 (protein-like tyrosine), C3 (long-wave humus), and C4 (short-wave humus). After irradiation for 168 h under UV-C, the protein-like components C1 and C2 had the highest fluorescence intensity reduction of 95.4% and 100%, respectively. The fluorescence intensities of fulvic-like components, namely C3 and C4, increased. The absorption coefficients (A355) of A-DOM were decreased by 84.46%, 70.83%, and 52.98% with UV-A, UV-C irradiation, and dark condition, respectively. The degradation reaction of C1 and C2 fitted with the first-order kinetic equation with a half-life of 21.59–83.51 h. The SUVA254 value decreased under UV irradiation and increased under dark condition, which is in accordance with the change of molecular weight results. The A-DOM photochemical reaction was driven by UV light irradiation, and the humification rate and molecular weight decreased.

scholarly journals Characteristics of Dissolved Organic Matter and Its Role in Lake Eutrophication at the Early Stage of Algal Blooms—A Case Study of Lake Taihu, China

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2278
Author(s):  
Shuhang Wang ◽  
Wenwen Wang ◽  
Junyi Chen ◽  
Bo Zhang ◽  
Li Zhao ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Fluorescence Intensity ◽  
Algal Blooms ◽  
Lake Taihu ◽  
Parallel Factor Analysis ◽  
Eutrophic Lakes ◽  
Overlying Water ◽  
Parallel Factor

Decaying algal blooms in eutrophic lakes can introduce organic matter into the water and change nutrient concentrations in the water column. The spatial distribution and composition characteristics, sources, and contribution to eutrophication of dissolved organic matter (DOM) in the overlying water of Lake Taihu, a typical eutrophic lake in China, were analyzed by ultraviolet–visible spectra and three-dimensional fluorescence excitation–emission matrix spectra combined with the statistical decomposition technique, parallel factor analysis. The concentration of DOM was represented by dissolved organic carbon (DOC), and DOC in overlying water of Lake Taihu was 2.86–11.83 mg/L. The colored DOM (CDOM) was characterized by an absorption coefficient at 280 nm (a280) and 350 nm (a350), which were 6.63–29.87 and 1.84–10.41 m−1, respectively. These values showed an increasing trend from southeast to northwest, and the high values were concentrated in the northwest and northern lake areas. The parallel factor analysis (PARAFAC) identified two protein-like (C1: tyrosine-like and C2: tryptophan-like) and one humic-like (C3: humic acid and fulvic acid) fluorescence components for fluorescent DOM (FDOM). The most dominant components were protein-like components (C1 + C2), whose fluorescence intensity contributed 87.55% ± 3.39% to the total fluorescence intensity (Ft) of FDOM (3.38 R.U.). The mean value of the fluorescence index (FI) and index of recent autochthonous contribution (BIX) of DOM was 1.77 and 0.92, and DOC, a280 and fluorescence intensities of FDOM components were all significantly and positively correlated with chl. a, indicating that DOM, CDOM, and FDOM were all mainly derived from algal activities and metabolites. The average humification index of the DOM was 0.66, which indicated a low humification degree. The protein-like DOM was correlated with DON and DOP, and might make great contributions to the continuous occurrence of algal blooms.

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