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Experiments and simulation of adsorption characteristics of typical neonicotinoids in urban stream sediments

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Abstract

Sediment adsorption is one of the main environmental fates of neonicotinoids (NEOs) in aquatic environments. Little information is available on for the adsorption characteristics of NEOs on urban stream sediments. In this study, urban tidal stream sediments were collected to determine the adsorption properties of four selected NEOs. The influence of environmental factors on NEO adsorption was determined by the RSM-CCD method. The NEO adsorption rates on sediments were established by multiple regression equations. As a result, the adsorption of four NEOs onto sediments fitted a linear isotherm model. The adsorption amounts of thiacloprid (THA), clothianidin (CLO), acetamiprid (ACE), and imidacloprid (IMI) were 1.68 to 2.24, 1.71 to 2.89, 1.88 to 3.07, and 2.23 to 3.16 mg/kg, respectively. The adsorption processes of four NEOs on urban sediments were favorable. Moreover, adsorption behaviors of NEOs were typical physical adsorption and readily adsorbed onto urban sediments. The adsorption processes of NEOs were exothermic reactions, and their adsorption rates decreased with increasing pH. Flow rates and organic matter contents could promote the adsorption ratios of typical NEOs. Multiple linear regression was used to assess the relationships between the adsorption rates of NEOs and environmental factors. The p-values of the fitting equations of adsorption rates were all less than 0.05. Within the ranges of concentration of the investigated factors, the multiple regression equations were able to reasonably model and predict the sorption of typical NEOs onto urban stream sediments. Therefore, the adsorption rate equations effectively predicted the NEO adsorption performance of urban streams and were helpful for controlling risk assessment of NEOs.

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All data used in this study are included in this published article and its supplementary information file.

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Funding

This research was funded by the Key Area Research and Development Program of Guangdong Province (2020B1111380003), the National Natural Science Foundation of China (U20A20117), and the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (2021ZT090543). We also much appreciate the editors and the anonymous reviewers for their suggestions and comments that are extremely helpful in improving quality of the manuscript.

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Qunpo Jia: formal analysis and writing (original draft; Bowen Li and Bo Li: sampling and data analysis; Yanpeng Cai: editing and reviewing, data analysis, and funding acquisition. Xiao Yuan: software and modeling development. All authors contributed to the study conception and design.

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Correspondence to Yanpeng Cai.

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Responsible Editor: Ester Heath

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Supplementary file1 (DOCX 63 KB)

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Jia, Q., Li, B., Li, B. et al. Experiments and simulation of adsorption characteristics of typical neonicotinoids in urban stream sediments. Environ Sci Pollut Res 30, 76992–77005 (2023). https://doi.org/10.1007/s11356-023-27025-x

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  • DOI: https://doi.org/10.1007/s11356-023-27025-x

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