Environmental Chemistry and Ecotoxicology最新文献

{"title":"Zinc oxide nanoparticles from leaf extract of Eclipta prostrata: Biosynthesis and characterization towards potential agent against film forming bacteria in metal working fluids","authors":"Gnanasekaran R. ,&nbsp;D. Yuvaraj ,&nbsp;G. Koteswara Reddy ,&nbsp;S. Naveen Shangar ,&nbsp;V. Vijayakumar ,&nbsp;J. Iyyappan","doi":"10.1016/j.enceco.2024.06.001","DOIUrl":"10.1016/j.enceco.2024.06.001","url":null,"abstract":"<div><p>Industrially important metal working fluids are reported to be vulnerable to microbial growth, leading to loss of its working efficiency. The present study is dedicated towards the green synthesis of Zinc Oxide (ZnO) nanoparticles using <em>Eclipta prostrata</em> leaf extract and investigated for antimicrobial activity. Characterization studies using Scanning Electron Microscopy (SEM) and Fourier Transform Infrared spectroscopy (FT-IR) displayed the presence of agglomerated rod shaped ZnO nanoparticles with characteristic peak between 700 and 500 cm⁻¹, respectively. Antimicrobial testing against gram-positive and gram-negative bacteria, as well as fungi, showed the ZnO nanoparticles' effectiveness. Against gram-positive bacteria, inhibition ranged from 0.48 to 1.51 at concentrations of 25 μl to 100 μl. Against gram-negative bacteria, inhibition ranged from 0.82 to 2.02, and against fungi, inhibition ranged from 1.20 to 2.34, all at the highest concentration tested. The results of the study indicate that the ZnO nanoparticles were effective against both fungi and bacteria, more effectively against gram negative bacteria. The results suggest that the green synthesized ZnO nanoparticles from <em>Eclipta prostrata</em> can be exploited to reduce the load of microbial contamination in metal working fluids.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 206-215"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000183/pdfft?md5=89435df3630a1604ba7b8dab8d3f60c3&pid=1-s2.0-S2590182624000183-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141413405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of organosulfur compound degradation property of a noble bacterial strain of Proteus mirabilis","authors":"Pritam Gyanaranjan Rout ,&nbsp;Sunil Kumar Behera","doi":"10.1016/j.enceco.2024.06.004","DOIUrl":"https://doi.org/10.1016/j.enceco.2024.06.004","url":null,"abstract":"<div><p>Organosulfur compounds asssociated with coal are the major contributors to environmental pollution. An organosulfur compound dibenzothiophene (DBT) occupies about 70% of all the organosulfur compounds detected in coal. Microbial desulfurization processes are evolving as a tool for the remediation of organosulfur compounds. The present work deals with a microbial processing technique developed for the degradation of an organosulfur compound DBT by a noble bacterial strain <em>Proteus mirabilis</em> isolated from petroleum-contaminated soil. The study revealed that the bacterium has a high tolerance towards higher concentrations of DBT and performed a normal rate of bacterial growth in a culture medium supplemented with 50 mM of DBT. The <em>Proteus mirabilis</em> bacterium catalyzed the microbial desulfurization of DBT present in the culture medium. It was estimated that the bacterium desulfurized about 99% of the DBT incubated in 500 mL of culture medium at 37 °C ± 2 with the <em>Proteus mirabilis for</em> 5 days<em>.</em> The high-performance liquid chromatography (HPLC) analysis showed the presence of 2-hydroxybiphenyl in the bacterial culture medium indicating that the bacterium has followed a sulfur-specific 4S microbial pathway for the degradation of DBT through the production of 2-hydroxybiphenyl.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 223-228"},"PeriodicalIF":9.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000201/pdfft?md5=610d6f6ec9233f3fbd6989dbd8c027b5&pid=1-s2.0-S2590182624000201-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of biochar on the remediation of cadmium-contaminated soil in an Eisenia fetida–Solanum nigrum system","authors":"QingRui Luo ,&nbsp;Chang’e Liu ,&nbsp;YiQiao Zhao ,&nbsp;WeiLan Zhang ,&nbsp;JinQuan Chen ,&nbsp;Ying Pan ,&nbsp;ChangQun Duan","doi":"10.1016/j.enceco.2024.04.003","DOIUrl":"10.1016/j.enceco.2024.04.003","url":null,"abstract":"<div><p>Biochar, plants, and earthworms have good remediation effects on cadmium (Cd)-contaminated soils. However, few studies have combined all three technologies to explore the treatment of Cd-contaminated soils. This study investigated the effect of corn straw biochar addition (1% and 5% mass ratios) on soil Cd treatment in an <em>Eisenia fetida</em>–<em>Solanum nigrum</em> system. The addition of corn straw biochar increased soil pH, total nitrogen (TN), total phosphorus (TP), and soil organic carbon (SOC); adding 5% (<em>w</em>/w) biochar under Cd stress resulted in significant increases (<em>P</em> &lt; 0.05) of soil pH, TN, TP, and SOC. Adding 5% (w/w) biochar under Cd stress increased Cd enrichment by <em>E. fetida</em> and <em>S. nigrum</em> and significantly reduced the soil total and available Cd contents (<em>P</em> &lt; 0.05). The addition of biochar increased the metallothionein content of <em>E. fetida</em>, which functions to resist Cd stress in high-Cd environments (<em>P</em> &lt; 0.05); with the addition of 5% (<em>w</em>/w) biochar, the metallothionein content was 1.55 times higher than in the 1% (<em>w</em>/w) biochar treatment, at 23.78 ng L⁻¹. Adding 5% (w/w) biochar significantly increased the Cd enrichment coefficient and transfer coefficient values of <em>S. nigrum</em> under high-Cd stress (<em>P</em> &lt; 0.05), reaching 7.37 and 1.89, respectively. Adding 5% (<em>w</em>/w) biochar significantly reduced the exchangeable and acid-soluble fraction of Cd, increased the oxidizable fraction, reduced Cd bioavailability, and mitigated physiological damage (<em>P</em> &lt; 0.05). The present study demonstrated that adding biochar to the <em>E. fetida</em>–<em>S. nigrum</em> system could effectively reduce the soil Cd pollution level, providing a new method and scientific guidance for the remediation of heavy metal-polluted soil.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 132-143"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000080/pdfft?md5=2abfecb0b969b8f6b61e9e0337f53d8b&pid=1-s2.0-S2590182624000080-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140768804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-vitro biodegradation of discarded marine microplastics across the eastern coast of the Bay of Bengal, India using Exiguobacterium sp.","authors":"Banismita Tripathy,&nbsp;Pallabi Punyatoya Sahoo,&nbsp;Harapreeti Sundaray,&nbsp;Alok Prasad Das","doi":"10.1016/j.enceco.2024.07.003","DOIUrl":"10.1016/j.enceco.2024.07.003","url":null,"abstract":"<div><p>Discarded marine plastics (DMPs) are emerging pollutants currently attracting significant attention. This present investigation focuses on the collection, characterization, and distribution analysis of DMPs collected from marine sediments followed by isolation and molecular characterization of microplastic-degrading native bacteria sequestered from Chandipur coast sediments, Bay of Bengal India. The study identified two potential microplastic-degrading strains, <em>Exiguobacterium</em> sp. (ON627837) and <em>Bacillus amyloliquefacin</em> (ON653029). The biodegradation investigation of 0.5 g of microplastic incubated under optimized conditions resulted in 4% weight loss after 30 days subject to 200 rpm constant shaking. SEM and FT-IR spectroscopy analysis of the microbial-degraded plastics' surface morphology and composition revealed uneven surfaces with residues compared with the control samples and suggested an abundance of PET (37%) which was further used for bioremediation analysis. This investigation emphasizes the significance of the biodegradation properties of the native bacterial isolates assessing the conditions and degradability of the microorganisms.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 236-247"},"PeriodicalIF":9.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000249/pdfft?md5=24765533142c9b7d4afd954b722ece97&pid=1-s2.0-S2590182624000249-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141623570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The growing threats and mitigation of environmental microplastics","authors":"Oyedolapo Bamigboye ,&nbsp;Moses O. Alfred ,&nbsp;Ajibola A. Bayode ,&nbsp;Emmanuel I. Unuabonah ,&nbsp;Martins O. Omorogie","doi":"10.1016/j.enceco.2024.07.001","DOIUrl":"10.1016/j.enceco.2024.07.001","url":null,"abstract":"<div><p>Microplastics (MPs) are emerging pollutants that constitutes a very serious environmental nuisance and menace to the globe in the last decade. The environmental damages from MPs include ecological imbalance of the marine environment, flora, and fauna and these are yet to be understood in the African environment. The sustainable development goals 14 and 15 (SDGs #14 and #15) seek to address the challenges in combating the sustainability of marine and terrestrial lives respectively. Understanding the pollution dynamics of MPs in the environment is crucial to the sustainability of lives globally and in particular Africa soon. Hence, it is imperative to arrest this environmental challenge as swiftly as possible before the collapse of the entire biomes. MPs have been detected in several matrices; soil, air, aquatic environments, plants, fishes, animals, and humans. Their different source routes: ingestion, inhalation, and dermal contact contribute an adverse effect (toxicity) to all spheres of life. To aquatic animals, terrestrial animals, and humans, it limits their movement, leads to the shedding of scales, inhibits growth, suppresses the immune system, and causes inflammation, coagulation, also blood cell toxicity among others, and on the long-run mortality was noted in this review. There is physical, chemical and biological transformation as microplastics age, leading to toxicity, mobility, and great environmental interaction. This has contributed to high MP intake by fish and other aquatic animals. For this reason, researchers should delve into simpler and cheaper ways of analyzing its presence in the environment and develop remediation strategies to curb its presence in the aquatic environment.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 259-268"},"PeriodicalIF":9.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000225/pdfft?md5=eba5830f2acd94c3dea60bfb45282f7b&pid=1-s2.0-S2590182624000225-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141707253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fungal bioremediation: An overview of the mechanisms, applications and future perspectives","authors":"Yuvaraj Dinakarkumar ,&nbsp;Gnanasekaran Ramakrishnan ,&nbsp;Koteswara Reddy Gujjula ,&nbsp;Vishali Vasu ,&nbsp;Priyadharishini Balamurugan ,&nbsp;Gayathri Murali","doi":"10.1016/j.enceco.2024.07.002","DOIUrl":"10.1016/j.enceco.2024.07.002","url":null,"abstract":"<div><p>Fungal bioremediation represents a promising and sustainable approach to addressing environmental pollution by exploiting the natural metabolic capabilities of fungi to degrade and detoxify a wide array of pollutants. This review provides a comprehensive overview of the mechanisms, applications, and future perspectives of fungal bioremediation. Fungi are uniquely equipped with an extensive arsenal of enzymes, including laccases, peroxidases, and hydrolases, which facilitate the breakdown of complex organic compounds, heavy metals, and xenobiotics into less harmful substances. The versatility of fungi enables their application across various environmental contexts, including soil, water, and air remediation. The efficacy of fungal bioremediation is demonstrated in its ability to degrade persistent organic pollutants such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and petroleum hydrocarbons, as well as to immobilize and transform heavy metals through biosorption and bioaccumulation. This review also discusses the challenges and limitations associated with fungal bioremediation, such as the need for optimized environmental conditions and potential ecological impacts. Future research directions are highlighted, including the integration of omics technologies for the elucidation of fungal metabolic pathways and the development of biotechnological innovations to scale up fungal bioremediation processes. This review underscores the critical role of fungi in environmental remediation and emphasizes the need for continued research and technological advancements to harness their full potential in addressing global environmental challenges.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 293-302"},"PeriodicalIF":9.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182624000237/pdfft?md5=a9c9ecaf1798e48b6ff8fda5f7de35f5&pid=1-s2.0-S2590182624000237-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141716261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Groundwater contamination and its potential health risk in Oba community, Anambra State, southeastern Nigeria: an index analysis approach","authors":"Emeka Christian Ezeudu ,&nbsp;Chideraa Courage Offor ,&nbsp;Christian Chukwuemeka Oli ,&nbsp;Adaobi Susan Nzelu","doi":"10.1016/j.enceco.2023.11.004","DOIUrl":"10.1016/j.enceco.2023.11.004","url":null,"abstract":"<div><p>The health risk associated with groundwater contamination of Oba community were studied. Water samples were collected from twelve boreholes, consumed by the inhabitants of the study area. Each sample was analyzed for 15 water quality parameters and the results indicated that all the groundwater samples were polluted with heavy metals (Pb, Co, As, Cr, and Cd). However, other physicochemical parameters of the samples (Cu, Cl⁻, NO₃⁻, PO₄³⁻, SO₄²⁻, TSS, TDS, EC, TH, and Salinity) were within the Nigerian Standard for Drinking Water Quality (NSDWQ) and WHO. All locations' weight arithmetic water quality index, heavy metal pollution index, heavy metal evaluation index, and degree of contamination exceeded their critical pollution index values of 100, 100, 6, and 3 respectively. Cobalt in Ama-Enumah, Okpuno-Etiti, and Rando sample locations had <span><math><msub><mi>HQ</mi><mi>der</mi></msub></math></span> &gt; 1 in both adults and children. Also, the study revealed that children had <span><math><msub><mi>HI</mi><mi>ing</mi></msub></math></span> &gt; 1 in all sample locations when compared to their adult counterparts, suggesting non-carcinogenic health risks for children through oral intake. Hence, water from these boreholes should be treated before use for drinking and other domestic and irrigation purposes.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 1-14"},"PeriodicalIF":0.0,"publicationDate":"2023-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182623000218/pdfft?md5=50159d6f4b70bc35d958ee6aaedd0c57&pid=1-s2.0-S2590182623000218-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138611688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Cattle Egret Bubulcus ibis as a near-global indicator of terrestrial pollution","authors":"Velesia Lesch ,&nbsp;Henrik Kylin ,&nbsp;Hindrik Bouwman","doi":"10.1016/j.enceco.2023.11.003","DOIUrl":"10.1016/j.enceco.2023.11.003","url":null,"abstract":"<div><p>Persistent organic pollutants (POPs) are omnipresent in the environment. Due to their physical and chemical properties, POPs bioaccumulate in higher trophic-level species. Birds inhabit many niches and trophic levels and share physiological characteristics with humans. Wild bird eggs reflect the pollution of the environment and exposure experienced by the female prior to egg formation. Bird eggs are relatively easy to collect, easy to handle and store, and decompose slowly. In addition, bird eggs can also be used as biomarkers by examining the eggshell pigmentation and thickness. Aquatic bird eggs have been used most often with less published on terrestrial birds that also suffer consequences of pollution. Here, we review candidate species whose eggs can be used as near-global indicators. We found the Cattle Egret (<em>Bubulcus ibis</em>) as a suitable near-global indicator of terrestrial pollution. It is the most widespread Ardeid with extensive natural expansion, not threatened, occurs in high numbers, breeds in colonies with other Ardeids, has a high trophic status, and eggs are relatively large and easy to collect. Eggs of Cattle Egrets from eight countries and four continents have been analysed for pollutants such as PCBs, DDTs, HCH, HCB, dicofol, aldrin, dieldrin, endrin, heptachlor, mirex, and endosulfan. Multi-country and trans-continental studies using Cattle Egret eggs would therefore be possible, tracking the effectiveness of interventions such as the Stockholm Convention.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"6 ","pages":"Pages 15-25"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590182623000206/pdfft?md5=35e7f7d24266e5aac25a55a37367be77&pid=1-s2.0-S2590182623000206-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138624534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occurrence, effects, and ecological risks of chemicals in sanitizers and disinfectants: A review","authors":"Ndeke Musee ,&nbsp;Phephile Ngwenya ,&nbsp;Lenah Kagiso Motaung ,&nbsp;Kgalifi Moshuhla ,&nbsp;Philiswa Nomngongo","doi":"10.1016/j.enceco.2023.01.003","DOIUrl":"https://doi.org/10.1016/j.enceco.2023.01.003","url":null,"abstract":"<div><p>In response to the novel coronavirus referred to as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) – a virus that causes COVID-19 disease has led to wide use of sanitizers and disinfectants. This, in turn, triggered concerns on their potential deleterious effects to human health and the environment due to numerous chemicals incorporated in both product categories. Here, the current state of science regarding the occurrence and ecological effects of different classes of chemicals in these products (e.g., ultraviolent filters, fragrances, etc.) are summarized in different natural (e.g., rivers) and engineered (e.g., wastewater treatment plants) systems. Data collected in the literature suggests chemicals incorporated in sanitizers and disinfectants are present in the environment, and a large portion are toxic to fish, algae, and daphnia. Using the risk quotient approach based on occurrence data, we found eight chemicals that posed the highest risk to aquatic organisms in freshwater systems were benzalkonium chloride, 4-chloro-m-cresol, sodium ortho phenyl phenate, hydrogen peroxide, 1, 2-propanediol, 4-Methyl-benzilidine-camphor, ethylhexyl methoxy cinnamate, and octocrylene. Considering limited occurrence and effects information for most chemicals, further studies on environmental monitoring and potential consequences of long-term exposure in aquatic ecosystems are recommended.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"5 ","pages":"Pages 62-78"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49891326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elevated blood mercury and haematological response in free ranging chicken (Gallus Gallus domesticus) from gold mining areas in Zamfara State Nigeria","authors":"Zainab Abdulmalik ,&nbsp;Muftau Shittu ,&nbsp;Sani Adamu ,&nbsp;Suleiman Folorunsho Ambali ,&nbsp;Bolaji Fatai Oyeyemi","doi":"10.1016/j.enceco.2022.12.003","DOIUrl":"https://doi.org/10.1016/j.enceco.2022.12.003","url":null,"abstract":"<div><p>Gold mining and other anthropometric activities in mining areas result in pollution. Mercury toxicosis is thus a common occurrence in chickens from gold mining areas (GMAs). The study was designed to evaluate and compare haematological response in chickens (<em>Gallus Gallus domesticus</em>) from Anka GMAs and Gusau Non‑gold mining areas (NGMAs) of Zamfara State, Nigeria. A total of sixty adult chickens were randomly selected in six locations (thirty each in GMAs and NGMAs). Blood mercury concentration was measured with atomic absorption spectrophotometer (AAS) with thermal decomposition. Haematological parameters which include packed cell volume (PCV), Red blood cell count (RBC), haemoglobin, heterophils, lymphocytes, total white blood cell count (TWBC), monocytes and heterophil/lymphocyte (H/L) ratio were measured using standard procedure. Both multivariate and univariate analysis were used to measure differences while correlation and regression were also used to analyse relationship between mercury and haematological parameters. Mean PCV 23.26%, RBC 2.661 × 10⁶/L, Haemoglobin 13.70 g/dL, TWBC 5.07 × 10 ⁹/L, Heterophils 2.00 × 10⁹/L and Lymphocytes 2.65 × 10⁹/L were significantly lower (<em>p</em> &lt; 0.05) in chickens from GMAs when compared with 33.39%, 3.77 × 10 ⁶/L, 19.79 g/dL, 10.13 × 10⁹/L, 2.82 × 10⁹/L and 4.91 × 10⁹/L respectively from NGMAs. However, monocytes 0.44 × 10⁹/L and H/L Ratio 0.788 were significantly higher in chicken from GMAs when compared with 0.24 × 10⁹/L and 0.54 from NMGAs. Hameatological parameters are direct correlates of mercury concentration. A unit increase in monocytes significantly (<em>p</em> &lt; 0.05) correspond to an increase in blood Hg level by 0.262 μg/mL. In conclusion, this research suggested that mining activities in GMAs exerts deleterious impacts on chicken haematological parameters. Result of this study will be of diagnostic significance in local chicken mercury toxicosis.</p></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"5 ","pages":"Pages 39-44"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49906663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}