{"title":"Environmental behavior of iodine povidone in aquaculture: stability and sediment adsorption kinetics.","authors":"Zhongen Tang, Jingtong Li, Lei Duan, Zifeng Luo, Jinrong Qiu, Jianli Zhou, Weida Yu","doi":"10.1007/s10653-025-02781-6","DOIUrl":null,"url":null,"abstract":"<p><p>The overuse of iodine-based disinfectants poses a potential threat to both biological health and the ecological environment. However, their stability and the adsorption kinetics of active iodine by pond sediment in aquaculture settings remain poorly understood, with mechanisms unclear. This study investigates the environmental factors influencing the stability and adsorption characteristics of povidone-iodine (PVP-I) in pond sediment. Results show that under low-temperature, light-avoiding, and acidic conditions, high concentrations of PVP-I exhibit slow depolymerization, with efficacy duration significantly affected by initial concentration, temperature, and pH. Adsorption kinetics conform to the Elovich equation, indicating temperature's significant impact on adsorption rate and non-homogeneous diffusion behavior. Sediment's maximum adsorption capacity for active iodine is 4.05 mg/g, consistent with the Freundlich isotherm model. Exceeding sediment adsorption capacity may lead to active iodine infiltration into groundwater. Additionally, temperature fluctuations can disrupt adsorption-desorption equilibrium, posing seasonal risks of iodine concentration fluctuations. This study suggests controlling PVP-I dosage and blocking pollution pathways via temperature regulation and sediment improvement in aquaculture, providing a scientific basis for ecological risk assessment and safe application.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"47 11","pages":"479"},"PeriodicalIF":3.8000,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Geochemistry and Health","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10653-025-02781-6","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
The overuse of iodine-based disinfectants poses a potential threat to both biological health and the ecological environment. However, their stability and the adsorption kinetics of active iodine by pond sediment in aquaculture settings remain poorly understood, with mechanisms unclear. This study investigates the environmental factors influencing the stability and adsorption characteristics of povidone-iodine (PVP-I) in pond sediment. Results show that under low-temperature, light-avoiding, and acidic conditions, high concentrations of PVP-I exhibit slow depolymerization, with efficacy duration significantly affected by initial concentration, temperature, and pH. Adsorption kinetics conform to the Elovich equation, indicating temperature's significant impact on adsorption rate and non-homogeneous diffusion behavior. Sediment's maximum adsorption capacity for active iodine is 4.05 mg/g, consistent with the Freundlich isotherm model. Exceeding sediment adsorption capacity may lead to active iodine infiltration into groundwater. Additionally, temperature fluctuations can disrupt adsorption-desorption equilibrium, posing seasonal risks of iodine concentration fluctuations. This study suggests controlling PVP-I dosage and blocking pollution pathways via temperature regulation and sediment improvement in aquaculture, providing a scientific basis for ecological risk assessment and safe application.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
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