Emerging Contaminants最新文献

{"title":"Human urinary occurrence of dithiocarbamate vulcanization accelerators and their exposure estimation","authors":"Zhenling Fu ,&nbsp;Hangbiao Jin ,&nbsp;Ruyue Guo ,&nbsp;Weili Mao","doi":"10.1016/j.emcon.2025.100499","DOIUrl":"10.1016/j.emcon.2025.100499","url":null,"abstract":"<div><div>Dithiocarbamate vulcanization accelerators (DVAs) are widely used in rubber manufacturing, yet their potential human exposure and associated health risks remain poorly understood. Previous studies have identified DVAs in various environmental matrices, such as dust and sediments, but their occurrence in human biological samples has not been investigated. This study aims to fill this critical research gap by conducting the first comprehensive biomonitoring assessment of DVAs in human urine, providing direct evidence of human exposure. A total of 263 urine samples were collected from Chinese adults and analyzed for eight DVAs. Seven out of eight target compounds were detected, with detection frequencies ranging from 14 % to 94 %. Zinc diethyldithiocarbamate (ZDEC) was the predominant compound, with a mean concentration of 1.6 ng/mL (range: &lt;LOD–12 ng/mL). Notably, males exhibited significantly higher urinary levels of ZDEC (1.7 ± 0.28 ng/mL vs. 1.3 ± 0.33 ng/mL; <em>p</em> = 0.021) and zinc dibutyldithiocarbamate (ZDBC; 0.78 ± 0.18 ng/mL vs. 0.50 ± 0.10 ng/mL; <em>p</em> = 0.017) compared to females, while urinary concentrations of ZDEC and zinc dibenzyldithiocarbamate (ZBEC) were inversely correlated with age. Daily exposure (DE) estimation revealed that ZDEC had the highest mean DE value at 48 ng/kg bw/day, followed by ZEPC (29 ng/kg bw/day) and ZDBC (21 ng/kg bw/day). These findings provide essential insights into human exposure patterns to DVAs, offering a scientific basis for future risk assessment and regulatory considerations. Given the widespread detection of these compounds and their potential toxicity, further research is warranted to elucidate their health implications and major exposure pathways.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100499"},"PeriodicalIF":5.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"N-nitrosamines in karst groundwaters in southwestern China: Risks and implications for drinking water safety","authors":"Xiongwei Gu ,&nbsp;Liwei Xu ,&nbsp;Xin Huang ,&nbsp;Yingjie Chen ,&nbsp;Yan Li ,&nbsp;Yuanyu Shan ,&nbsp;Xiaoyu Yan ,&nbsp;Zhaojue Liu ,&nbsp;Honghu Zeng ,&nbsp;Wenwen Chen ,&nbsp;Huanfang Huang","doi":"10.1016/j.emcon.2025.100497","DOIUrl":"10.1016/j.emcon.2025.100497","url":null,"abstract":"<div><div>Groundwater is a vital drinking water source for populations in remote karst regions. However, the highly developed karst tube systems facilitate the infiltration of surface wastewater containing <em>N</em>-nitrosamines, raising concerns about groundwater safety. To assess the safety of groundwater and identify which types are safer for consumption, this study investigated <em>N</em>-nitrosamines in various groundwater types, including ground river, karst cavern, well, and mountain spring waters, in Guangxi, a typical karst region in southwestern China. The total concentrations of eight <em>N</em>-nitrosamines in groundwater ranged from 5.1 to 70.3 ng/L, with <em>N</em>-nitrosodiethylamine (NDEA), <em>N</em>-nitrosodimethylamine (NDMA), and <em>N</em>-nitrosopyrrolidine (NPYR) being the dominant species. Ground river water exhibited significantly higher <em>N</em>-nitrosamine concentrations than karst cavern, well, and mountain spring waters. Significant correlations between <em>N</em>-nitrosamines and dissolved inorganic nitrogen suggested their co-emissions from domestic wastewater and the secondary formation potential of <em>N</em>-nitrosamines in groundwater. Redundancy analysis further identified domestic and swine wastewater as the primary sources. Ground river and mountain spring waters posed the highest risks among the four groundwater types, with 30 % and 20 % of sites, respectively, exceeding acceptable cancer risk thresholds. These findings underscore the importance of thorough water treatment before groundwater is used for drinking. Strict livestock farming and domestic wastewater discharge regulations are essential to mitigate contamination risks, particularly in karst areas.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100497"},"PeriodicalIF":5.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence and risk assessment of per- and polyfluoroalkyl substances (PFASs) in water, sediment, soil, and moss: An environmental media study in Caohai, China","authors":"Luolin Bao ,&nbsp;Chan Xu ,&nbsp;Chan Zhang ,&nbsp;Fenglian Zeng ,&nbsp;Bangnian Xu ,&nbsp;Chaoxuan Liao ,&nbsp;Hongbo Yang","doi":"10.1016/j.emcon.2025.100489","DOIUrl":"10.1016/j.emcon.2025.100489","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl compounds, also known as \"forever chemicals\", are ubiquitous in the environment and harm human health. Developing safer, eco-friendly alternatives is vital, but new compounds may cause new issues. Enhanced monitoring and risk assessment are essential. In this study, the detection of PFASs in environmental media, including lake surface water, bottom sediment, soil, and bryophytes, was accomplished by instrumentation in the Caohai region. Subsequently, their distribution characteristics and ecological risks were scientifically analyzed and evaluated. The results showed that new and traditional PFASs were widely found in Caohai, a non-industrial area, and showed obvious short-chain and new PFAS substitution effects. The total concentrations of PFASs (ΣPFASs) in surface water and sediment were measured at 39.55–67.64 ng/L and 2.36–11.55 ng/g dry weight (dw), respectively. The concentrations of ΣPFASs in soil and moss ranged from 0.39 to 1.31 ng/g dw and from 8.90 to 18.07 ng/g dw, respectively. Notably, PFBA and F-53B emerged as the most prevalent PFAS compounds in this region. The calculated risk quotients (RQs) for PFASs are less than 0.01, indicating no significant environmental risk. However, the long-term cumulative risk cannot be ignored, and the ecological protection of Caohai still needs to be paid attention to. The results of this study can help understand the pollution level of PFASs in the wetland water system in plateau areas and provide data references for environmental control such as PFASs pollution protection and ecological management in Caohai.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100489"},"PeriodicalIF":5.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pharmaceuticals and personal care products in soil: Sources, impacts and myco-remediation strategies","authors":"Moharana Choudhury ,&nbsp;Manab Deb Adhikari ,&nbsp;Sangita Agarwal ,&nbsp;Palas Samanta ,&nbsp;Anu Sharma ,&nbsp;Debajyoti Kundu ,&nbsp;Sunil Kumar","doi":"10.1016/j.emcon.2025.100488","DOIUrl":"10.1016/j.emcon.2025.100488","url":null,"abstract":"<div><div>Bioremediation is an effective and sustainable method for removing xenobiotic pollutants from the environment, utilizing microorganisms and plants to metabolize harmful chemicals into harmless compounds like CO₂ and water. Among various bioremediation strategies, mycoremediation stands out due to the unique enzymatic capabilities and metabolic diversity of fungi, enabling them to degrade persistent and toxic pollutants under harsh environmental conditions. This review specifically addresses the application of mycoremediation to emerging contaminants pharmaceuticals and personal care products (PPCPs) which pose significant environmental challenges due to their persistence, bioaccumulation potential, and ecotoxicity.</div><div>This article provides a comprehensive overview of fungal-based strategies for PPCP remediation, documenting the fate, distribution, and impacts of these contaminants in soil. It highlights the enzymatic mechanisms and fungal species involved in PPCP degradation, with an emphasis on their ecological resilience and pollutant-specific adaptability. Additionally, the review explores under-discussed factors influencing fungal efficacy, such as pH, temperature, and contaminant concentration, alongside innovative advancements like myco-nanotechnology and enzyme engineering that enhance remediation efficiency.</div><div>By integrating these aspects with policy perspectives and sustainable development goals, this review contributes novel insights into the potential of mycoremediation as a cutting-edge approach for mitigating PPCP contamination. It underscores the role of fungi in advancing circular economy principles and offers a foundation for future research and practical applications in environmental management.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100488"},"PeriodicalIF":5.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organophosphate ester contamination in long-term plasticulture soils: Co-occurrence of tri/di-OPEs, influence factors, source Attribution, and environmental risks","authors":"Yangyang Liu ,&nbsp;Yuting Ren ,&nbsp;Huijie Dang ,&nbsp;Mengfei Liu ,&nbsp;Ke Hu ,&nbsp;Ang Zhao ,&nbsp;Wei Liu ,&nbsp;Yuxia Yang ,&nbsp;Chao Wei ,&nbsp;Jianzhong Xu ,&nbsp;Mei Wang","doi":"10.1016/j.emcon.2025.100487","DOIUrl":"10.1016/j.emcon.2025.100487","url":null,"abstract":"<div><div>This study focused on the pollution characteristics, influencing factors, and source apportionment of organophosphate triesters (tri-OPEs) and diesters (di-OPEs) in the plastic greenhouses soils with cultivation periods ranging from 6 to 32 years. The concentrations of Σ₁₃tri-OPEs and Σ₅di-OPEs in soil samples ranged from 39.60 to 730.52 ng/g dw and 2.25–6.94 ng/g dw, respectively. Tris (chloroethyl) phosphate was the predominant tri-OPE, while dibutyl phosphate was the most abundant di-OPE. The levels of OPEs pollution increased with the age of mulch film, highlighting the impact of the duration of mulch film usage on OPE accumulation. The type of fertilizer significantly impacted OPE levels. Soil samples treated with compound fertilizers showed the highest concentration of tri-OPEs, reaching up to 205.32 ng/g dry weight. In contrast, the highest concentration of di-OPEs was found in soil samples treated with water-soluble fertilizers, with a peak of 3.89 ng/g dry weight. Total organic carbon, pH, total nitrogen, and total phosphorus had minimal effect on OPEs levels. According to the Positive Matrix Factorization Model, the primary sources of OPEs included the use of pesticides, food packaging materials, and small-scale machinery (48.39 %), water and reclaimed water irrigation (17.68 %), the utilization of agricultural films (17.39 %), and atmospheric deposition and degradation processes (16.54 %). Compared to the moderate risks associated with compounds such as tri-2-ethyl phosphate, 2-ethylhexyl diphenyl phosphate, and tris(1-chloro-2-propyl) phosphate, tris(chloroethyl) phosphate exhibited a higher risk level in soil samples. This study offers insights into the potential risks linked to OPE contamination in agricultural soils.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100487"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review on the combined toxicological effects of microplastics and their attached pollutants","authors":"Mengzhen Li ,&nbsp;Wenhao Ma ,&nbsp;James Kar Hei Fang ,&nbsp;Jiezhang Mo ,&nbsp;Lei Li ,&nbsp;Min Pan ,&nbsp;Rong Li ,&nbsp;Xiaoyun Zeng ,&nbsp;Keng Po Lai","doi":"10.1016/j.emcon.2025.100486","DOIUrl":"10.1016/j.emcon.2025.100486","url":null,"abstract":"<div><div>As an emerging environmental pollutant, microplastics (MPs) can adsorb various contaminants, including heavy metals and persistent organic pollutants (POPs). This ability stems from their small size and high specific surface area. Once adsorbed, the adherents can act in combination with MPs to produce synergistic toxic effects when they enter organisms through MPs, exacerbating their toxicity when introduced into organisms. This review examines the toxicological effects of the combination of different MPs and environmental pollutants on terrestrial and marine invertebrates, vertebrates, and microorganisms. In conclusion, the combined toxicological effects of MPs and their attachment to organisms are complex and multilayered. Existing studies have identified certain underlying mechanisms, underscoring the need for societies and governments to account for the combined toxic effects of MPs and their associated pollutants.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100486"},"PeriodicalIF":5.3,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epidemiological perspectives on emerging contaminants and gout or hyperuricemia","authors":"Weiwen Fu ,&nbsp;Yangyi Guang ,&nbsp;Zixing Zhang ,&nbsp;Cheng Zhou ,&nbsp;Xinyu Fang","doi":"10.1016/j.emcon.2025.100485","DOIUrl":"10.1016/j.emcon.2025.100485","url":null,"abstract":"<div><div>Recently, there has been a global rise in the burden of hyperuricemia and gout, attributed to socio-economic development and rapid urbanization. Emerging contaminants (ECs), associated with industrialization, including endocrine-disrupting chemicals (EDCs), persistent organic pollutants (POPs), pesticides, heavy metals, and microplastics (MPs). These contaminants may potentially exacerbate the prevalence and incidence of hyperuricemia and gout through various pathways. In this review, we outline the recent epidemiologic studies between ECs and hyperuricemia and gout and discuss the common exposure pathways of ECs, aiming to inform strategies for reducing exposure and mitigating future health impacts.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100485"},"PeriodicalIF":5.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Targeted and non-targeted LC-MS analysis of microcystins in Clarias gariepinus from fishponds","authors":"Odo J. Bassey ,&nbsp;Munyaradzi Mujuru ,&nbsp;Mulalo I. Mutoti ,&nbsp;Adeeyo Adeyemi ,&nbsp;Farai Dondofema ,&nbsp;Jabulani Ray Gumbo","doi":"10.1016/j.emcon.2025.100484","DOIUrl":"10.1016/j.emcon.2025.100484","url":null,"abstract":"<div><div>Cyanotoxins produced by cyanobacteria are formidable threats to aquatic ecosystems and public health worldwide. The potential health risks associated with cyanotoxins from contaminated fishponds are becoming a growing concern, as cyanotoxin production has steadily increased over time in these aquatic environments. Therefore, this study aims to utilize targeted and non-targeted Liquid Chromatography Mass Spectrometer (LC-MS) analytical methods to detect cyanotoxins in catfish (<em>Clarias gariepinus</em>) tissue harvested from fishponds. For detecting cyanotoxins in fish tissue utilizing the non-targeted approach, high-resolution MS/MS spectra data obtained from the analysis were converted to mzML format, analyzed with the Global Natural Product Social (GNPS) Library and CANOPUS annotations for LEVEL 3 metabolite identification, and visualized as a molecular network in Cytoscape. Regarding the targeted method, the toxin identification and quantification were achieved by comparing samples spiked with known concentrations of MC-RR and YR to an authentic toxin standard. The results of the target analysis showed that microcystin variant MC-RR was not detected in the fish tissue. The MC-YR variant was detected in the intestines and gills of <em>Clarias gariepinus</em> at concentrations of 13.2–10.6 μg/g and 1.5–13.9 μg/g, respectively. The muscle tissues across all fish ponds showed MC-YR concentrations between 10.5 and 16.06 μg/g. The highest concentration of MC-YR was found in the liver tissue in pond 6 (20.9 μg/g). The untargeted LC-MS method led to the identification of a larger number of cyanometabolites in the fish tissue, such as aeruginosins, anabaenopeptins, microginins. Non-toxic secondary metabolites like octadecadienoic acid, while phosphocholine (PC), ethanesulfonic acid, pheophorbide A, microcolins, cholic acid, phenylalanine, amyl amine and phosphocholine (PC), triglyceride (TG), phosphocholine (PC) and sulfonic acid derieved from cyanobacteria, fish and anthropogenic sources were also detected in the fish tissues. The non-targeted analysis facilitates the identification of both unexpected and unknown compounds.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100484"},"PeriodicalIF":5.3,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exposure assessment of 113 exogenous chemicals simultaneously in serum samples from children in north Shandong, China, and their association with sex, age, and body mass index","authors":"Fenghong Zhang ,&nbsp;Danyang Wang ,&nbsp;Mengxue Zhi,&nbsp;Jianshe Wang","doi":"10.1016/j.emcon.2025.100483","DOIUrl":"10.1016/j.emcon.2025.100483","url":null,"abstract":"<div><div>Children are particularly vulnerable to adverse effects from exposure to environmental chemicals, necessitating comprehensive assessment to mitigate health risks. In this study, we analyzed 477 serum samples from children aged 2–6 years in North Shandong, China, using liquid chromatography-mass spectrometry (LC-MS) to create an exposure profile of 184 exogenous chemicals. These chemicals encompass pesticides, pharmaceuticals, industrial and consumer chemicals, and food additives. Of these, 113 exogenous chemicals were identified above the limit of detection in the serum of at least one child participant, and 37 were detected in more than 30 % of the children. Notably, 17 of the 24 selected perfluoroalkyl and polyfluoroalkyl substances (PFAS) were detected. PFOA, PFBA, and PFHxS exhibited the highest concentrations, with geometric means of 38.11 ng/mL, 17.39 ng/mL, and 7.35 ng/mL, respectively. The elevated levels of short-chain PFBA suggests increased production and environmental release in recent years. Analysis of sex-based differences revealed significant differences in the serum levels of 11 chemicals, with nine compounds displaying higher concentrations in girls than in boys. Notably, long-chain PFAS, including PFUnDA, PFDA, and PFTrDA, were present at higher concentrations in girls, while short-chain PFHpA and PFBS were higher in boys. Additionally, serum levels of diphenyl phosphate and fipronil sulfone declined slightly with age, indicating heightened exposure risk during early childhood. Positive associations between monoethyl phthalate and fipronil sulfone concentrations with BMI categories were observed, suggesting a potential obesogenic effect of these compounds. This study provides critical insights into the profiles of exogenous chemicals in young children and highlights the need for targeted risk assessment of environmental pollutants impacting pediatric health.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100483"},"PeriodicalIF":5.3,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional assessment of heavy metal contamination in soil affected by urbanization at the urban-rural interface of Chengdu","authors":"Rong Liao ,&nbsp;Zeming Shi ,&nbsp;Ke Cheng ,&nbsp;Na Zhang ,&nbsp;Ge Jin ,&nbsp;Dewei Wang ,&nbsp;Kun Lin ,&nbsp;Lvhang Yang ,&nbsp;Kailiang Zhang ,&nbsp;Junji Zhang","doi":"10.1016/j.emcon.2025.100482","DOIUrl":"10.1016/j.emcon.2025.100482","url":null,"abstract":"<div><div>Urbanization, particularly the transformation of agricultural land into urban areas, significantly impacts soil quality, especially concerning the concentration and distribution of heavy metals. This study investigates the spatial distribution of six heavy metals (As, Cd, Cr, Pb, Ni, and Zn) in soils at the urban-rural interface of Chengdu, focusing on areas transitioning from agricultural land to urbanized land and back to agricultural land. The study analyzes the three-dimensional spatial distribution of heavy metals and assesses the impact of urbanization on soil contamination. It was found that the top 1-m soil layer exhibited higher concentrations of heavy metals compared to the bedrock and deeper soil layers. A combination of geochemical assessments, including the Ratio of Secondary Phase to Primary Phase (RSP) and the Risk Assessment Code (RAC), was used to evaluate the ecological risks posed by these metals. The findings indicate that Cd is the most hazardous contaminant, with contamination levels being particularly high in older urban areas (N2, Shuangliu) and at river confluences (N6, Huayang). Soils in the old urban area not only had a higher total amount of heavy metals but also had a higher proportion of its heavy metal exchangeable form. These areas face significant ecological risks, and the study suggests that targeted soil remediation strategies should be developed, with a focus on urban soil reclamation and risk mitigation.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 2","pages":"Article 100482"},"PeriodicalIF":5.3,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}