Search Results (3,988)

Cicadas are a traditional food in China. In this study, we performed multielement analysis on cicadas using Inductively Coupled Plasma–Mass Spectrometry (ICP-MS). In total, 40 cicada samples were collected in Hebei Province (China). Comparing the results of mushroom and vegetable samples selected as the standard foods among the eight food categories, which had the highest correlation with other food categories, there are 12 elements (Al, Mn, Zn, Cu, Cd, Ba, Se, V, As, Li, Pb and Co) in cicadas both higher than mushroom and vegetable samples, which a total of 25 elements were detected. The Principal Component Analysis (PCA), cluster analysis, and correlation analysis were used in the data analysis. HQ (Hazard quotient) value for Cd, As, Pb, and Al is 0.281 in males and is 0.324 in females. Concentrations of essential trace elements (Zn, Cu, and Se) in cicadas ranged from 1.7 to 101.9 times higher than those in mushrooms or vegetables. We analyzed in detail the two perspectives: one is the risk of potentially toxic elements, and the other is the enrichment of essential trace elements. In this study, we reveal that cicadas show a low risk of potentially toxic elements and high concentrations of essential trace elements, making them an edible insect. Full article

Trakošćan Lake is an artificial lake created in the mid-19th century for aesthetic and economic purposes. The area around the lake has been protected as park forest. Recently, the lake has become the most famous example of eutrophication in Croatia, as by 2022, a significant amount of sediment had accumulated in it. Therefore, the lake was drained that same year, followed by mechanical removal of the sediment. The total amount of sediment removed was 204,000 m³. After the removal work, a particularly important question arose of what to do with such a large amount of sediment. The objective of this research was to gain specific insight into the chemical composition of the sediment with the aim of its possible use in agricultural production for increasing the quality of arable land. A comprehensive qualitative geochemical and agrochemical analysis of the sediment composition was carried out for the first time, including indicators of the pH value, amount of organic matter and carbon, total nitrogen, available phosphorus and potassium, amount of carbonates, and the presence of metals, metalloids, and non-metals, of which As, Cd, Hg, and Pb are toxic. Electrochemical, spectrophotometric, and titration methods were used, along with three atomic absorption spectrometry techniques. The results of the analyses were interpreted in comparison with the natural substrate, as well as with the current regulations for agricultural land in the Republic of Croatia. According to this, sediment is not harmful for the environment. Full article

Rapid urbanization and increased anthropogenic activities have led to the release of an increasing number of pollutants, including metals, into freshwater ecosystems, posing a significant threat to aquatic life. In this study, the bioaccumulation of metals and hepatic enzyme activities in northern pike (Esox lucius) from two contrasting freshwater ecosystems in Serbia, the lotic Tisza River and the lentic Bela Crkva Reservoirs, were investigated. A total of 22 specimens (11 per site) were sampled in autumn 2024. The liver tissue was analyzed for the concentrations of 11 metals (As, Cd, Cr, Co, Cu, Pb, Li, Fe, Zn, Mn, Ni) and the activities of the liver enzymes (ALT, AST, AP, GGT). The results showed ecosystem-specific patterns of metal accumulation, with the northern pike in the rivers showing significantly higher Cu and Fe levels, while the fish in the reservoirs showed increased Zn concentrations. Enzymatic biomarkers showed different responses between ecosystems, with river fish showing increased ALT and AST activities, indicating hepatocellular stress, while reservoir fish showed increased GGT, indicating enhanced detoxification processes. The body condition factor was negatively correlated with liver Mn and Zn concentrations, emphasizing its utility as an integrative bioindicator of metal-induced stress. No significant sex-specific differences in metal or enzyme levels were found. These results suggest the suitability of northern pike as a sentinel species for environmental monitoring in freshwaters and highlight the different physiological adaptations to local metal stress in lentic and lotic habitats. Full article

Modified biochars have emerged as effective adsorbents for remediating heavy metal-contaminated environments, yet variability in modification methods, feedstocks, and pyrolysis conditions has led to inconsistent findings. This study provides a quantitative meta-analysis of 173 peer-reviewed publications to systematically evaluate how modification strategies, feedstock types, and pyrolysis temperatures influence the adsorption of cadmium (Cd), lead (Pb), and copper (Cu). Six modification approaches were assessed (metal oxides, bases, strong acids, weak acids, hydrogen peroxide, and physical treatments), pyrolysis temperatures were grouped into three ranges (<400 °C, 400–550 °C, and >550 °C), and feedstocks were categorized as wood-, straw-, herbaceous-, and manure-based. Effect sizes were calculated to identify the most effective combinations of modification, feedstock, and thermal regime, providing a robust, data-driven framework for predicting biochar performance. Results show that metal oxide-treated biochars consistently exhibited the highest adsorption, while physical modifications were least effective. Moderate pyrolysis temperatures (400–550 °C) and wood-derived biochars also significantly enhanced adsorption across all three metals. These findings provide actionable guidance for designing tailored biochars, resolving inconsistencies in the literature, and supporting future studies aimed at optimizing biochar for heavy metal remediation and sustainable environmental applications. Full article

Soils in alpine mining areas suffer from severe heavy metal contamination and infertility, yet little is known about the effects of different materials on soil improvement in such regions. In this study, a field experiment was conducted in farmlands contaminated by the Lanping lead–zinc mine in Yunnan, China, to compare the effects of four materials (biochar, organic fertilizer, lime, and sepiolite) on soil properties, heavy metal (lead (Pb), cadmium (Cd), copper (Cu), and zinc (Zn) fractions and their availability, and the growth of Phaseolus coccineus L. Results showed that biochar and organic fertilizer significantly enhanced soil nutrient content and enzyme activities. Lime, biochar, and sepiolite effectively reduced heavy metal bioavailability by promoting their transition to residual fractions. Notably, biochar outperformed other materials by substantially increasing grain yield (by 82%), improving nutritional quality (sugars, protein, and starch contents raised by 20–88%), and reducing heavy metal accumulation in grains (by 36–50%). A comprehensive evaluation based on subordinate function values confirmed biochar as the most effective amendment. Structural equation modeling further revealed that biochar promoted plant growth and grain quality primarily by enhancing soil available nutrients and immobilizing heavy metals. These findings demonstrate the strong potential of biochar for remediating heavy metal-contaminated farmlands in alpine lead–zinc mining regions. Full article

While adaptogens are popular in dietary supplements for their health-promoting properties, their safety is compromised by the risk of heavy metal contamination, a threat amplified by inconsistent regulatory standards. This study aimed to assess the extent of heavy metal contamination in adaptogenic supplements on the Polish market and evaluate their compliance with international safety limits. Eleven commercially available supplements (tablets, powders, dried materials) containing Withania somnifera, Rhodiola rosea, Panax ginseng, and Schisandra chinensis were analyzed for lead (Pb), cadmium (Cd), mercury (Hg), nickel (Ni), and other elements using flame atomic absorption spectroscopy (FAAS) and mercury analysis (AMA 254). Results demonstrated widespread contamination, primarily with Pb and Ni. In processed forms (tablets and dried fruits), Pb concentrations exceeded permissible limits by up to 235%, while Ni levels were exceeded by up to 321%. Schisandra chinensis preparations showed the highest contamination levels. Furthermore, raw materials from India contained significantly higher Ni concentrations than those from China (p < 0.01). These findings reveal that a majority of the tested supplements fail to meet toxicological safety criteria, posing a significant health risk to consumers. This underscores a critical regulatory gap and highlights the urgent need for harmonized standards and stringent quality control for dietary supplements. Full article

The release of heavy metals during coal combustion may pose potential hazards to the surrounding environment and human health. In this study, we investigated the migration characteristics and ecological risks of heavy metals during the combustion of two distinct raw coal samples (C1 and C2) sourced from Shanxi Province. The analytical results demonstrate significant differences in volatilization behavior between the samples, with total heavy metal release rate ranging from 30.25% to 98.92% for C1 and from 17.77 to 98.16% for C2. Four elements—Cd, As, Pb, and Hg—exhibited preferential migration to fly ash fractions A1 and A2, displaying higher transfer coefficients compared to other monitored heavy metals. Chemical speciation analysis revealed that elemental release behavior was predominantly governed by residual phases (2.2–81.4%), Fe-Mn oxide-bound forms (3.7–45.6%), and sulfate-associated fractions (1.3–56.8%). Combustion temperature showed nonlinear positive correlations with the volatilization rates of Cd, As, Pb, and Hg. Hg volatilization decreases at a combustion temperature below 600 °C, whereas for Cd, As, and Pb, this temperature is below 800 °C. Ecological risk indices (RI) indicate substantial contamination potential in fly ash matrices: A1 (RI = 285.32) is dominated by Hg (I_geo = 1.9, $E_r^i$ = 224) with a notable contribution from Cd ($E_r^i$ = 51), whereas A2 (RI = 246.67) showed a predominance of Cd (I_geo = 1.6, $E_r^i$ = 138) over Hg ($E_r^i$ = 94.4). These findings underscore the need for optimized combustion parameters and enhanced particulate filtration systems to mitigate environmental impacts associated with coal-fired power generation. Full article

Heavy metal exposure is linked to obesity and systemic inflammation. This study explored the mediating role of body mass index (BMI) in the association of heavy metal exposure with high-sensitivity C-reactive protein (hs-CRP). Blood levels of mercury (Hg), cadmium (Cd), and lead (Pb) were assessed in a nationwide sample of 4521 adults. Linear regressions were employed to examine associations among blood heavy metal levels, BMI, and hs-CRP levels. Mediation analyses were conducted to estimate the indirect effect of exposure to each heavy metal on the elevation of hs-CRP through an increase in BMI. The median (Q1; Q3) values for blood levels of heavy metals were 3.15 (2.10; 4.84) for Hg (μg/L), 0.95 (0.63; 1.38) for Cd (μg/L), and 1.67 (1.28; 2.21) for Pb (μg/dL). Blood Hg level was associated with both BMI (adjusted β: 0.73; 95% CI [confidence interval]: 0.51; 0.96) and a log-transformed hs-CRP level (adjusted β: 0.07; 95% CI: 0.02; 0.13). Blood Cd and Pb levels showed no clear associations with BMI and hs-CRP. The indirect effect of Hg exposure on hs-CRP via BMI was 0.069 (95% CI: 0.037; 0.102), and that of the direct effect was 0.003 (95% CI: −0.001; 0.007), with BMI accounting for 95.7% (95% CI: 88.6%, 102.0%) of the total association between Hg levels and hs-CRP levels. Hg exposure was linked to increased hs-CRP levels, with elevated BMI explaining most of this association. This research offers insights into the mechanisms through which Hg contributes to systemic inflammation, underscoring the potential role of BMI as a key mediator. Full article

Urban and peri-urban farmers in Malawi increasingly use treated and untreated wastewater for vegetable production, but little is known about the extent of heavy metal accumulation in both exotic and indigenous vegetables, particularly with respect to differences between edible tissues (leaves vs. stems). This study addresses this gap by measuring the concentrations of cadmium (Cd), chromium (Cr), lead (Pb), zinc (Zn), and copper (Cu) in wastewater, soils, and six vegetables including three exotic and three indigenous irrigated with effluent from the Soche Wastewater Treatment Plant in Blantyre. Metal concentrations were determined using Atomic Absorption Spectrophotometry. Wastewater contained Zn (0.01 ± 0.001 mg/L) and Cu (0.02 ± 0.018 mg/L), both below World Health Organization (WHO) and Malawi Bureau of Standards (MBS) limits (Zn: 0.2 mg/L; Cu: 2 mg/L), while Cd, Cr, and Pb were below detection limit. In soils, Zn reached 56.4 ± 0.5 mg/kg, exceeding the WHO limit of 36 mg/kg; other metals remained within WHO permissible values. Vegetables showed species- and tissue-specific variation in metal accumulation: Cr reached 4.65 mg/kg in Cucurbita moschata stems, Cd up to 0.31 mg/kg in Amaranthus retro-flexus leaves, and Pb up to 4.09 mg/kg in Brassica rapa stems—all above FAO/WHO permissible limits (2.3, 0.2, and 0.3 mg/kg, respectively). Duncan’s post hoc analysis confirmed significant differences (p < 0.05) across matrices and plant parts, with leaves generally accumulating more Zn and Cu than stems. Principal component analysis (PCA) revealed that Zn, Cu, Cr, and Pb in the wastewater-soil-vegetable system largely share a common source, likely wastewater effluent and historical soil contamination, while Cd showed a more sporadic distribution, highlighting differential accumulation pathways. Health risk assessments revealed high Health Risk Index (HRI) values, with Brassica rapa stems (HRI = 92.3) and Brassica rapa subsp. chinensis leaves (HRI = 82.2) exceeding the safe threshold (HRI > 1), indicating potential chronic risks. This study reveals potential health risks associated with wastewater irrigation due to heavy metal accumulation in edible vegetables, and therefore recommends further research on metal speciation, seasonal variation, and bioaccumulation at different crop growth stages. Full article

Liuyang, the primary fireworks manufacturing base in the world, is demonstrating potential metals pollution risks. In this study, 163 soil samples were collected in Liuyang City, China, for source apportionment, pollution assessment and health risk evaluation using self-organizing map, positive matrix factorization and statistical methods. Geostatistical analysis confirmed high contamination risks from Hg, Cd, Pb, and As. Samples were classified into four groups based on contamination characteristics. Pollution sources included irrigation water, fireworks enterprises, and fireworks packaging material. Cluster 1 exhibited uniformly low metals concentrations, with sampling points widely distributed across the study area. Cluster 2 samples were concentrated in the central and northern regions. The average concentration of Cr was the highest, with irrigation water contributing the most to Cr at 74%. The contribution of fireworks companies and packaging materials was 14% and 12%, respectively. Cluster 3 displayed elevated Hg and Pb levels with distinct spatial banding, where fireworks enterprises contributed 49% (Hg) and 47% (Pb), while packaging materials accounted for 37% (Hg) and 39% (Pb). Cluster 4, gathered in the southeast, showed the highest Cd and As concentrations, with fireworks companies contributing the most with 73% and 82%, respectively. Risk assessment demonstrated that children experienced greater non-carcinogenic risks from oral and dermal exposure to As, Hg, Pb, Cr, and Cd, while adults faced higher inhalation risks for Cr and Cd. Carcinogenic risks exceeded safety thresholds, with children (4.1 × 10⁻⁹–2.0 × 10⁻⁴) more vulnerable than adults (2.9 × 10⁻¹²–1.4 × 10⁻⁴). Asdult carcinogenic risks via ingestion dominated, whereas Cr posed greater risks for children through inhalation. Full article

Stingless bee cerumen is a mixture of wax and plant resins. Foragers of stingless bees are exposed to various chemical contaminants during their plant visits and collection activities. These contaminants have the potential to be transferred into the nest. This study aimed to elucidate the existence of chemical contaminants in Ecuadorian cerumen. To this end, the following aims were established: (i) to determine and quantify glyphosate (GLY), aminomethylphosphonic acid (AMPA), some other pesticides, metals and metalloids in cerumen and (ii) to establish possible risks associated with the presence of these chemical contaminants to the health of stingless bees and humans. The quantification of chemical contaminants was conducted using gas chromatography (GC), liquid chromatography (LC), and ion chromatography (IC) coupled to mass spectrometry (MS). Glyphosate (0.02–0.2 mg/kg) and AMPA (0.028 mg/kg) were detected in four of the pooled samples (n = 14) from the northern and southern highland regions. Other pesticide traces were not detected in any cerumen samples. Metals (Cd, Cr, Pb, Ni, Sn) and metalloids (As, Sb, Se) were found in all samples, including highlands and the lower Amazon. The potential risks of exposure to glyphosate and AMPA for stingless bees and humans appear to be minimal (except for the specific conditions given for Tetragonisca angustula) and safe, respectively. It seems that cerumen may serve as an effective biomonitoring matrix for assessing the environmental health of stingless bee nests. Establishing guidelines and regulations for the safe use and handling of products derived from the stingless bee consumption is therefore imperative. Full article

The remediation of soils contaminated with heavy metals and radionuclides remains a significant environmental challenge. This study evaluated the phytoremediation potential of industrial hemp (Cannabis sativa L.) in soil collected from a historical evaporation dam, characterized by high levels of diverse metals, including Al, Cr, Fe, and radioactive elements (U, Th). Three treatments were applied: a control, a metal-spiked treatment (chelated with citric acid), and an NPK + spike treatment. A separate six-month greenhouse trial compared plants grown with and without NPK nutrients. Results demonstrated that the addition of a chelating agent significantly enhanced the bioavailability and subsequent uptake of key metals, including U, Se, and Pd. NPK fertilization combined with chelation resulted in the greatest plant biomass (≈4.5 g) and height (>18 cm), which correlated with higher total metal accumulation. Bioaccumulation factors (BAF > 1) were highest for B, Sr, Cd, and Bi, with values for Cd and U reaching 1.3 and 2.1, respectively. Foliar analysis revealed that leaves accumulated significantly higher metal concentrations than stems (e.g., Translocation Factor (TF) ~ 2.0 for Cd, Pb, and U), acting as the primary sink. This study concludes that hemp, particularly when assisted with chelating agents and adequate nutrition, is a highly effective candidate for the phytoremediation of multi-metal contaminated soils. The NPK + chelation strategy is the most promising for maximizing both biomass production and metal extraction efficiency. Full article

To investigate the heavy metal contamination status and associated health risks in the groundwater of South Dongting Lake, China, 88 groundwater samples were collected and analyzed for the contents of heavy metals (Fe, Mn, Cu, Zn, As, Cd, Pb). The heavy metal pollution characteristics and human health risks were comprehensively analyzed using a combined approach of the Heavy Metal Pollution Index (HPI), Heavy Metal Evaluation Index (HEI), Water Quality Index (WQI), and by integrating traditional health risk assessment with Monte Carlo simulation. The results indicated that manganese (Mn) and iron (Fe) were the most prominent pollutants in the regional groundwater, with exceedance rates of 35.3% and 25.0%, respectively. Arsenic (As) showed localized exceedances (13.91 μg/L, 1.39 times the standard limit). Spatially, contamination levels were higher in the north and lower in the south, with Fe, Mn, and As enrichment concentrated in the northern region, correlating with geological structures and industrial discharges. Health risk assessment revealed that the total carcinogenic risk (TCR) for children (1.82 × 10⁻⁴) exceeded the safety threshold by 82%, with arsenic being the primary carcinogen (contribution rate: 74.7%). The non-carcinogenic total hazard index (HI) reached 3.59 for adults and 6.54 for children, significantly exceeding the acceptable level of 1.0. Manganese was identified as the core non-carcinogenic risk source (Hazard Quotient (HQ) for children = 3.35). Monte Carlo simulation confirmed that pollutant concentration and exposure time were the most sensitive risk-driving factors. This study provides a scientific basis for prioritizing the control of As and Mn pollution in the northern region and implementing protective measures against children’s exposure. Full article

Background: Cerebral malaria (CM) is a severe and often fatal complication of Plasmodium falciparum infection that causes devastating brain injury largely through immune-mediated mechanisms. Pathogenic brain-infiltrating CD8⁺ T cells are key drivers of CM pathology, yet the intracellular signals enabling their harmful autoimmune-like activity remain poorly defined. Here, we identify protein kinase C θ (PKCθ), a central antigen receptor-signalling mediator, as a critical contributor to experimental cerebral malaria (ECM). Methods/Results: Using a PKCθ null allele mouse strain on a C57BL/6N background, we demonstrate that PKCθ deficiency significantly improves survival in Plasmodium berghei ANKA (PbA)-infected mice without altering parasite burdens in the blood or brain. Mechanistically, loss of PKCθ skews T cell differentiation towards central memory (Tcm) rather than effector memory (Tem) phenotypes, thereby reducing effector differentiation and sequestration of CD8⁺ T cells in the cerebral microvasculature. This prevents extensive neurovascular damage, preserves neural tissue integrity, and alleviates neurological signs and symptoms. Our findings provide genetic evidence that PKCθ drives CD8⁺ T cell-mediated brain injury in ECM. Conclusions: These results underscore the potential for repurposing clinically PKCθ inhibitors as host-targeted interventions to protect against cerebral injury and improve outcomes in patients with CM. Full article

Cooking liquor (CL) from marine species processing has been reported to include a wide range of valuable constituents. In this study, the chemical composition of CL from octopus (Octopus vulgaris) processing, with and without a filtration process, was analysed. Regarding non-filtered CL, values of 15.30, 0.29, 8.85 and 174.53 g·L⁻¹ CL for protein, lipids, ash, and total volatile base-nitrogen (TVB-N), respectively, were detected. The most abundant fatty acids (FAs) (g·100 g⁻¹ total FAs) were C16:0 (37.8), C18:0 (20.8), and C22:6ω3 (13.4). Values of 0.40 and 2.10 were obtained for polyunsaturated FA/saturated FA and ω3 FA/ω6 FA ratios. Macroelement content varied from 0.036 (Ca) to 1.81 (Na) g·L⁻¹ CL. For microelements, values ranged between 0.0015 (Co) and 1.95 (As) mg·L⁻¹ CL. Industrial filtration of CL led to decreased values of protein, lipid, ash, TVB-N, and C22:5ω3; in contrast, an increased presence of C14:0, C18:1ω9, C20:1ω9, and C22:1ω9 was detected. Filtration led to a ca. 50% decrease in macroelement presence. For microelements, this process led to losses of 20–40% (Ba, Pb), 40–60% (As, Fe, Mn), 60–70% (Co, Zn), and 84% (Cd). This study provides a first comprehensive characterisation of octopus cooking liquor as a potential source of bioactive compounds. Full article