Applied Geochemistry最新文献

{"title":"Stream sediment geochemical anomaly identification and mapping in the Xinbo area, northern China: Using a catchment basin approach and the Apriori algorithm","authors":"Ming Liang ,&nbsp;Panfeng Liu ,&nbsp;Rui Tang ,&nbsp;Xiaodong Wang ,&nbsp;Chao Li ,&nbsp;Feng Zhu","doi":"10.1016/j.apgeochem.2025.106566","DOIUrl":"10.1016/j.apgeochem.2025.106566","url":null,"abstract":"<div><div>Stream sediment geochemical data are widely used for regional anomaly identification and mineral exploration mapping. However, conventional anomaly detection methods primarily rely on single-element anomaly extraction of ore-forming elements, an approach that often results in incomplete prospecting information and make it difficult to detect prospecting signals. This study reanalyzes and reinterprets 1:50000 geochemical reconnaissance survey data from the Xinbao area of North China (primarily stream sediment data, with supplementary soil geochemical data). By integrating the Catchment Basin Approach (CBA) and the Apriori algorithm, we (1) constructed a catchment basin model, (2) identified high-order correlations among elements and their concentration levels, and (3) established an association rule dataset of mineral exploration significance. Next, we extracted petrogenetically and metallogenically significant association rules for geochemical mapping and mineral exploration. We further compared these association rules with Principal Component Analysis (PCA) to validate the efficacy of the Apriori algorithm in delineating stream sediment anomalies. Within the target areas delineated based on mineralization element association rules, all known Pb, Zn, Ag and Au deposits previously identified through 1:10000 soil geochemical surveys were accurately detected. Our findings demonstrate that the combined CBA-Apriori approach significantly enhances the detection of geochemical anomalies, thereby improving the applicability of stream sediment data in mineral exploration. Also of note is that our approach served to identify two new target areas - CAVZ-1 (Pb–Zn–Au dominant) and CAVZ-2 (Ag–Au dominant) within the survey area.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106566"},"PeriodicalIF":3.4,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strontium isotope and multi-tracer insights into groundwater mixing and fluoride mobilization in the Luanhe River Delta, Northern China","authors":"Zhuo Zhang ,&nbsp;Futian Liu ,&nbsp;Sheming Chen ,&nbsp;Jing Zhang ,&nbsp;Wanjun Jiang ,&nbsp;Hang Ning ,&nbsp;Wengang Liu ,&nbsp;Zhipeng Gao ,&nbsp;Wengeng Cao ,&nbsp;Huaming Guo","doi":"10.1016/j.apgeochem.2025.106567","DOIUrl":"10.1016/j.apgeochem.2025.106567","url":null,"abstract":"<div><div>Understanding groundwater mixing processes and geochemical behavior is an urgent priority for elucidating the mechanisms responsible for fluoride (F⁻) enrichment in groundwater. This study collected 54 groundwater samples and 8 surface water samples from the coastal Luanhe Delta and analyzed their chemical compositions, ⁸⁷Sr/⁸⁶Sr ratio, ¹⁴C, as well as ¹⁸O and D isotopes. The results revealed substantial mixing between surface water and groundwater, as well as among groundwater from different aquifers, primarily induced by intensive groundwater extraction. Using the IsoSource mixing model, which incorporated ⁸⁷Sr/⁸⁶Sr ratios and δ¹⁸O values, vertical leakage was quantitatively identified as the primary recharge mechanism for shallow and deep groundwaters. This process of vertical mixing also enhanced the potential of high F⁻ groundwater dispersing across different aquifers. Furthermore, ternary mixing models using ⁸⁷Sr/⁸⁶Sr ratios, Ca/Sr and Mg/Ca molar ratios indicated that the chemistry of shallow groundwater was predominantly controlled by evaporite dissolution, while that of deep groundwater was mainly influenced by calcite dissolution. The observed relationship between ⁸⁷Sr/⁸⁶Sr ratios and Na/Sr molar ratios indicated that cation exchange occurred in deep groundwater, whereby this process promoted the dissolution of F-bearing minerals through the consumption of dissolved Ca²⁺. Additionally, under high pH conditions, the competitive adsorption between OH⁻ and F⁻ further enhanced the mobilization of F⁻. This study demonstrated that ⁸⁷Sr/⁸⁶Sr ratio served as a reliable tracer for unraveling groundwater evolution and F⁻ enrichment processes in complex coastal aquifer systems.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106567"},"PeriodicalIF":3.4,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lead concentration derives phase alteration of hydroxylapatite","authors":"Lingchang Kong ,&nbsp;Xin Liu ,&nbsp;Tianming Liu ,&nbsp;Baogang Zhang ,&nbsp;Hao Liu ,&nbsp;Zhaohui Li ,&nbsp;Guocheng Lv ,&nbsp;Libing Liao","doi":"10.1016/j.apgeochem.2025.106560","DOIUrl":"10.1016/j.apgeochem.2025.106560","url":null,"abstract":"<div><div>Hydroxylapatite is an important precipitant used in removing heavy metal contaminants through phosphate-induced metal stabilization (PIMS), where phase alteration plays a critical role. For lead pollution, the uptake mechanism is also affected by lead concentration. However, the mechanism in conjunction with lead concentration remains unclear, and the lead uptake mechanism remains different opinions. In this study, pathways of lead uptake and the influence of the initial lead concentration were systematically investigated using biogenic hydroxylapatite through the in-situ and ex-situ transmission electron microscope, XPS and Rietveld Refinement. The lead removal process was dominated by dissolution-precipitation and surface adsorption, without significant cation exchange. The findings indicate that concentration has a crucial effect on the lead uptake behavior of hydroxylapatite, especially for the precipitation of hydroxylpyromorphite. The heterogeneous growth of hydroxylpyromorphite gradually transformed into homogeneous growth with increasing lead concentration. Meanwhile, the total proportion of the dissolution-precipitation mechanism decreased with an increase in lead concentration, whereas the effect of the adsorption mechanism was likely enhanced by re-adsorption of lead by newly formed precipitates. The findings in this work provide a comprehensive insight into the mechanism of lead removal by hydroxylapatite, and infer that biogenic hydroxylapatite can play an important role in the environmental remediation of lead.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106560"},"PeriodicalIF":3.4,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methane seepage dynamics and ground heating phenomena in the southern Po Valley: the case study of Santa Maria Nuova (Italy)","authors":"G. Capelli Ghioldi ,&nbsp;G. Tamburello ,&nbsp;A. Sciarra ,&nbsp;D. Rouwet ,&nbsp;T. Ricci ,&nbsp;R. Civico ,&nbsp;F. Tassi ,&nbsp;P. Severi ,&nbsp;M. Liuzzo ,&nbsp;M. Coltorti ,&nbsp;A.L. Rizzo","doi":"10.1016/j.apgeochem.2025.106565","DOIUrl":"10.1016/j.apgeochem.2025.106565","url":null,"abstract":"<div><div>Natural reservoirs that release CH₄ can substantially increase atmospheric greenhouse gas levels, posing environmental and safety risks. Degassing phenomena in the Emilia-Romagna region (Italy) have been documented across a variety of fluids and reservoir types, with a focus on their origin and evolution. This study combines ground measurements and satellite data analysis to explore the relationships between CH₄ seepage, thermal anomalies, and vegetation stress at the Santa Maria Nuova (SMN) site in southern Po Valley. The explosion of a CH₄-saturated water well in July 2021 prompted a two-year investigation in the adjacent cultivated field (1.5 ha), revealing significant spatial and temporal variations in diffuse CH₄ fluxes (ranging from 0 to 917 g m⁻² d⁻¹) and corresponding CO₂ fluxes (1.9–466 g m⁻² d⁻¹). Soil temperature measurements and thermal imaging identified localised ground heating, attributed to methanotrophic exothermic oxidation of CH₄ to CO₂. These hotspots correspond to areas of visibly stressed vegetation, marked by reduced vitality and barren areas. Satellite-derived Ratio Vegetation Index (RVI) data confirmed persistent vegetation stress over the anomaly site from 2017 to 2024. Geochemical analysis of soil gases indicated a primarily biogenic origin of CH₄, supported by isotopic signatures (δ¹³C–CH₄ values &lt; −60 ‰ V-PDB) and the presence of shallow Pleistocene carbonate deposits beneath the site, which can generate CH₄ seepage. These findings demonstrate the utility of integrating ground-based and remote sensing techniques for monitoring CH₄ seepage and its environmental impacts.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106565"},"PeriodicalIF":3.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145059936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soil gas geochemical prospecting for deep mineral exploration: A case study of covered deposits on the southern Tibet Plateau","authors":"Gao-Xin Li ,&nbsp;You-ye Zheng ,&nbsp;Khan Junaid ,&nbsp;Xin Chen ,&nbsp;Jian-Hui Wu ,&nbsp;Feng Gao ,&nbsp;De-Cai Lin ,&nbsp;Yong Zhang","doi":"10.1016/j.apgeochem.2025.106542","DOIUrl":"10.1016/j.apgeochem.2025.106542","url":null,"abstract":"<div><div>The Tibet Plateau is rich in mineral resources, but its high altitude and harsh conditions make exploration costly and challenging, with a decreasing discovery rate utilizing orebody outcrops. To address this, a novel, efficient, and economical soil gas measurement method was tested using a Portable Multi-component Gas Rapid Analyzer (PMGRA) on typical deposits, including the Mengya'a skarn Pb–Zn, the Qulong porphyry Cu–Mo, and the Zhaxikang hydrothermal Pb–Zn–Sb deposits. The results showed elevated levels of CO₂, H₂S, and SO₂ gases above concealed orebodies, while concentrations were generally lower in non-mineralized areas. Sulfurous gases (H₂S, SO₂) were the most reliable indicators of mineralization, while CO₂ could indicate fault and fracture zones. Soil gas concentrations vary across different mining areas and above different ore bodies within the same mining area, especially sulfrous gases. The concentration of sulfurous gases is positively correlated with both the thickness of the orebody and the grade of mineralization. Additionally, the distribution patterns of these gases effectively indicate the scale and orientation of the concealed orebody. The varying primary sources of these gases lead to differences in their concentrations across different deposits. In conclusion, Soil gas measurement using PMGRA is an effective method for locating deep-buried sulfide orebodies. Its economic, portable, and rapid characteristics make it highly suitable for metal sulfide mineral exploration in high-altitude regions like the Tibet Plateau.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106542"},"PeriodicalIF":3.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145099519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution of trace elements in the tailings of the B1 dam, in the Córrego do Feijão mine, and in soils affected after the dam breach","authors":"Luciano Rodrigo Gomes Santos ,&nbsp;Giovanna Moura Calazans ,&nbsp;Lucas Pereira Leão ,&nbsp;Renan Barrach Guerra ,&nbsp;Mariangela Garcia Praça Leite","doi":"10.1016/j.apgeochem.2025.106561","DOIUrl":"10.1016/j.apgeochem.2025.106561","url":null,"abstract":"<div><div>The chemical, physical, and mineralogical characteristics of tailings from the B1 dam at the Córrego do Feijão Mine were evaluated to understand the distribution and potential mobility of trace elements, especially in tailings with original characteristics without incorporation of other materials or debris, information little referenced in the literature. Twenty samples of dam tailings (RJ) were collected directly from the B1 original reservoir. Seven samples of substrates potentially affected (SPA) were obtained from the Ferro-Carvão stream basin in areas affected by the dam breach (tailings potentially mixed with soil or other debris).</div><div>Unaffected soil samples (SNA, without any contribution of tailings) were also collected in the vicinity of the affected areas. The soils were collected to help understand how the original characteristics of the tailings were modified by their incorporation throughout the affected area in the Ferro e Cargo stream basin. Mineralogical assessments using techniques such as X-ray diffraction, SEM-EDS and Advanced Mineral Identification and Characterization System (AMICS) revealed predominant iron oxide minerals (hematite, goethite, and magnetite) in the tailings, with varying proportions of quartz, kaolinite, and feldspar. Sequential extraction protocols indicated that basically iron and manganese were primarily associated with crystalline oxides and hydroxides, suggesting stability related to trace metals. The results obtained in this study show that the substrates potentially affected by the collapse of the B1 tailings dam along the Ferro-Carvão stream basin exhibit physical, chemical, and mineralogical characteristics with a transitional profile between those of the remaining tailings in the B1 dam and the unaffected soils. The findings underscore the importance of comprehensive geochemical characterization to assess the environmental risks posed by mine tailings and to evaluate trace element mobility in complex tailings environments.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106561"},"PeriodicalIF":3.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning of lithium and gallium accumulation based on the major element contents in coal gangue from Shanxi province coalfields","authors":"Kezhou Yan,&nbsp;Longyi Zhao,&nbsp;Kaizhi Yang,&nbsp;Yu Che,&nbsp;Yanxia Guo,&nbsp;Fangqin Cheng","doi":"10.1016/j.apgeochem.2025.106562","DOIUrl":"10.1016/j.apgeochem.2025.106562","url":null,"abstract":"<div><div>Coal gangue, a byproduct of coal mining and processing, contains valuable elements like aluminum, silicon, iron, calcium and titanium, along with a certain amount of lithium (Li) and gallium (Ga). Shanxi, a major coal-producing province in China, produces a substantial amount of coal gangue with Li and Ga accumulation, indicating potential for resource recycling. Nevertheless, the low concentration and dispersed distribution characteristics of Li and Ga in coal gangue pose challenges for their direct determination. This study employed machine learning to assess eight models for analyzing Li and Ga accumulation in coal gangue based on its major components. The results indicated that Li and Ga contents in coal gangue from Shanxi Province coalfields vary widely, with Li and Ga content ranging between 50-300 ppm and 20–40 ppm, respectively. The XGB model showed superior performance in analyzing Li and Ga contents in coal gangue, revealing that Al₂O₃, TiO₂ and loss on ignition (LOI) in coal gangue are positively correlated with Li and Ga contents; while K₂O and Na₂O are negatively correlated with Li content, and K₂O, Na₂O and Fe₂O₃ are negatively correlated with Ga content. The diverse correlations between the major components and the Li and Ga contents in coal gangue may be attributed to the charge imbalance structures of aluminosilicate minerals, isomorphic ion substitution in aluminosilicates, and the physical and chemical adsorption properties of organic matter. This study provides theoretical guidance for exploring the occurrence forms and high-value utilization of trace elements such as Li and Ga in coal gangue.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106562"},"PeriodicalIF":3.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The distribution of uranium and thorium in groundwaters of the West Siberian artesian basin","authors":"D.A. Novikov ,&nbsp;L.G. Vakulenko ,&nbsp;P.A. Yan ,&nbsp;F.F. Dultsev ,&nbsp;A.V. Chernykh","doi":"10.1016/j.apgeochem.2025.106563","DOIUrl":"10.1016/j.apgeochem.2025.106563","url":null,"abstract":"<div><div>The data on the distribution of uranium and thorium in groundwaters and fluid-impermeable layers of the Mesozoic sediments in the northern regions of the West Siberian basin are presented. The studied waters are diverse in major-ion chemistry and total salinity (from 2 to 5 up to 63,3 g/L). The concentrations of natural radionuclides vary within broad ranges (mg/L): U (4,90∙10-7 – 5,14∙10–3), Th (1,90∙10-6 – 8,93∙10–3). The Th/U ratio varies from 0,07 to 93,1, and its maximal value is characteristic of the waters from the Valanginian aquifers. The Th/U ratio detected for fluid-impermeable rocks is within rather narrow range, 1,82–5,24, 3,56 on average. Against this background, the lowest values Th/U = 0,07–1,71 are characteristic of the rocks of Bazhenov formation, known for its natural radioactivity to be related to uranium. The radionuclide composition of groundwaters of the oil and gas bearing sediments with high Th/U ratios was formed under strongly reductive conditions, when thorium is more mobile than uranium. The evolution of the sedimentary basin led to widespread water expulsion processes and redistribution of U and Th in the water – rock system. Under the oxidative geochemical settings of the upper hydrodynamic zone, U is much better soluble than Th, though it also can be adsorbed on the surface of minerals and get bound into secondary mineral phases. No increase in U and Th concentrations with an increase in the age of water-bearing sediments was detected in the reductive geochemical settings. The results obtained provide for the first time the confirmation of thorium-based nature of radioactivity of the groundwaters in one of the world's largest West Siberian artesian basin.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106563"},"PeriodicalIF":3.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gaseous elemental mercury emissions in the Yangbajing geothermal field, Tibetan Plateau","authors":"Yutao Sun ,&nbsp;Peizhan Li ,&nbsp;Yue Zhang ,&nbsp;Xiaoyong Zhao ,&nbsp;Yaru Li ,&nbsp;Zhengfu Guo ,&nbsp;Wenbin Zhao ,&nbsp;Xiangang Xie","doi":"10.1016/j.apgeochem.2025.106540","DOIUrl":"10.1016/j.apgeochem.2025.106540","url":null,"abstract":"<div><div>Mercury (Hg) is a volatile, toxic trace metal. Gaseous elemental mercury (Hg⁰) is a prevalent form of Hg in the atmosphere and is considered a dangerous pollutant with various adverse effects on both humans and the environment. The continental subduction zone, where volcanism is particularly active, is an important and unique area where the mercurriferous belt is found. In this work, a quantitative estimation of the Hg⁰ emissions in the Yangbajing (YBJ) geothermal field, which is located in the Indian–Asian continental subduction zone, was performed. According to our analysis, soil diffuse emission and fumarole degassing were the main forms of Hg⁰ emissions in the YBJ geothermal field. Significant differences in Hg⁰ emissions were observed between the northern and southern areas of the YBJ geothermal field. The Hg⁰ emission fluxes from soil diffuse emissions in the northern and southern areas, as well as fumarole degassing in the southern area, were 107.5–31,954.2 ng m⁻² d⁻¹, 2.8–11,039.3 ng m⁻² d⁻¹, and 28.7–73,229.4 ng m⁻² d⁻¹, respectively. Furthermore, the Hg⁰ emissions in both the northern and southern areas were spatially distributed along the NE-trending fault. This finding demonstrated the influence of geological tectonic setting on the Hg⁰ emissions in the geothermal field. In addition to the Hg⁰ flux, the gas compositions, carbon isotopes, microbial community abundance, and diversity of bacteria and archaea in the northern and southern areas exhibited significant differences. These differences indicated that Hg⁰ emissions in the northern and southern areas originated from magmatic and hydrothermal systems, respectively. The Hg⁰ emissions in the YBJ geothermal field are attributable to magmatic and hydrothermal degassing, thermal release, and microbial activities. Our work indicated that continental subduction zones are important areas of Hg⁰ degassing. Future research should focus on Hg⁰ emissions in continental subduction zones.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106540"},"PeriodicalIF":3.4,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highway runoff and wastewater effluents as drivers of platinum dynamics in an urban river: Insights from a comprehensive monitoring study","authors":"Maxime Chastanet ,&nbsp;Antoine Lerat-Hardy ,&nbsp;Jörg Schäfer ,&nbsp;Melina Abdou ,&nbsp;Thomas Gardes ,&nbsp;Antoine Marache ,&nbsp;Maxime Debret ,&nbsp;Alexandra Coynel","doi":"10.1016/j.apgeochem.2025.106550","DOIUrl":"10.1016/j.apgeochem.2025.106550","url":null,"abstract":"<div><div>The contribution of a single rain event to daily and annual platinum (Pt) transport in an urban river (Jalle River, South-West of France), assessed from high resolution and annual monitoring, is discussed in terms of dissolved (Pt_d) and particulate (Pt_p) partitioning, sources and fluxes. In normal discharge conditions, the Jalle River Pt_d and Pt_p concentrations are respectively 1.90 ± 1.62 ng L⁻¹ and 19.8 ± 6.9 μg kg⁻¹ and Pt is mostly transported in the dissolved form (∼96 %, 110 ± 123 mgPt_d d⁻¹), due to low sediment yield and urban discharges from a wastewater treatment plant (WWTP). The Pt_d flux in sewage (36–340 mgPt_d d⁻¹) was mainly attributed to excretions from patient undergoing chemotherapy with Pt-drugs (up to 480,000 mgPt_d yr⁻¹ at the watershed scale). After a 2-months dry period, an intense rainstorm discharged ≥112 mg of Pt_p in 4 h from the urban highway, resulting in additional 295 mgPt_p d⁻¹ exceptionally transported by the Jalle River. In contrast to normal conditions, during the rainstorm up to ∼95 % of Pt was transported in particulate form during the <em>first flush</em>, and 80 % of the highway Pt_p flux during the first 40 min contributing to ∼one third of the annual Pt_p flux. Short, intense discharge events must be monitored at a high resolution to accurately estimate annual Pt fluxes in urban rivers.</div></div>","PeriodicalId":8064,"journal":{"name":"Applied Geochemistry","volume":"193 ","pages":"Article 106550"},"PeriodicalIF":3.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145046800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}