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Spectral characteristic of the waters with different sizes of particles: impact of water quality and land-use type

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Abstract

Natural colloids (NCs) are heterogeneous mixtures of particles in the aquatic environments that are strongly influenced by land use and water quality between terrestrial and aquatic environments. However, the relevant study paid little attention to the difference among the waters with different sizes of particles (e.g., suspended particulate matter (SPM), NCs, and the truly soluble substances). In this study, the spectral properties of these different waters were investigated from different land-use types in the Yuan River basin, China. Results of the UV–visible absorption spectral showed that with the particle size increased, the aromaticity, chromophoric dissolved organic matter, and humification degree of organic matter increased, while the condensation degree decreased. Data analysis from the fluorescence indices indicated that the source and the autochthonous feature of the truly soluble substances differed from that of NCs and SPM, whereas the protein-like component was mainly combined with the relatively larger size of particles (i.e., SPM and NCs), especially the downstream. Although the spectral characteristics of the water samples were strongly influenced by the water quality (> 45%), the land-use type might be the real potential impactor. Furthermore, the influence of land-use type on the spectral properties differed between the large and small scale of the buffer strips and between the mainstream and the tributaries. And this effect was more significant on the fluorescence properties in the mainstream and the spectral properties for NCs than for SPM. The study helps to understand the biogeochemical effects of the waters with different particle sizes.

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The authors declare that all relevant data supporting the findings of this study are included in this article and its supplementary information files.

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Funding

The work was supported by the National Natural Science Foundation of China (No. 42067058 and 42067034). Additional funding was provided by the Natural Science Foundation of Jiangxi Province (No. 20202BAB203015 and 20202BAB203014), the Training Project for Major Academic Disciplines and Technology Leader of Jiangxi Province (20212BCJL23058, S2022RCDT2K0628), and the Open Fund of Key Laboratory of Eco-geochemistry, Ministry of Natural Resources (ZSDHJJ202004).

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ZL: conceptualization, methodology, formal analysis, execution, writing—original draft. PW: methodology, writing—review and editing. CY: conceptualization, methodology, formal analysis, writing—review and editing. MN: conceptualization, validation, writing—review and editing. XX: methodology, validation, writing—review and editing. MD: conceptualization, validation, writing—review and editing.

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Correspondence to Caixia Yan.

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The authors declare no competing interests.

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Responsible Editor: Xianliang Yi

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Lv, Z., Wang, P., Yan, C. et al. Spectral characteristic of the waters with different sizes of particles: impact of water quality and land-use type. Environ Sci Pollut Res 30, 9543–9557 (2023). https://doi.org/10.1007/s11356-022-22757-8

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  • DOI: https://doi.org/10.1007/s11356-022-22757-8

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