Dissolved oxygen drives the environmental behavior of heavy metals in coastal sediments

Liu, Xiaozhu; Sheng, Yanqing; Liu, Qunqun; Jiang, Ming

doi:10.1007/s10661-022-09975-w

Cited by 7 publications

(1 citation statement)

References 47 publications

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“…After Cd enters the aquatic environment, it is mainly sequestered in the sediment through various adsorption and absorption processes (Rajeshkumar et al, 2018;Jaskuła and Sojka, 2022), causing Cd to become enriched in sediments. Changes in aquatic parameters such as dissolved oxygen (Liu et al, 2022), dissolved organic matter (Wang et al, 2010), pesticides (Wang et al, 2016), salinity (Jia et al, 2021), pH, and redox potential can release Cd from sediments, leading to secondary pollution of overlying waters.…”

Section: Introductionmentioning

confidence: 99%

Effects of dinotefuran and humic acid on cadmium migration and transformation in sediments

Wang,

Bian,

Yao

et al. 2024

Preprint

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The heavy application of dinotefuran (DNT) pesticide in agricultural production and the humic acid (HA) ubiquitous in the aqueous systems have burdened the environment as a new pollutant. The chemical fraction and mobility of cadmium (Cd) in sediments of urban river environments in which DNT and HA coexist are poorly understood. In this study, sequential extraction, ultraviolet-visible spectroscopy (UV-vis), fluorescence excitation-emission matrix (EEM), fourier transform infrared spectrometer (FTIR) techniques, and the Stern-Volmer equationwere integrated to identify the effects of DNT, pH, concentration and molecular weight (Mw) fractions of HA on the content and chemical fraction of Cd in sediments. The DNT dosage strongly affected the Fe–Mn oxide-associated Cd chemical fraction in sediments. HA facilitated migration of Cd from sediments to water. Cd release from sediments was also promoted by a lower pH of 5–6 compared to pH 8–9. Increasing concentrations of higher molecular weight HAs of >100 kDa, 30–100 kDa, and 30–10 kDa reduced total Cd, exchangeable/acid soluble fraction, and reducible fraction content in sediments, while 1–10 kDa and <1 kDa HA did not significantly influence Cd chemical fraction or content. The present study provides new insights into the environmental risks and partitioning of Cd in sediments under co-exposure to DNT and HA.

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