Journal of Environmental Chemistry and Ecotoxicology最新文献

{"title":"Mercury pollution in Africa: A review","authors":"Abdoul Kader, Alassane Moussa, Alassane Youssao, Abdou Karim, Alphonse S. Avocefohoun, E. Azokpota, Olivier Donard, D. Mama, D. Sohounhloué","doi":"10.5897/jece2022.0490","DOIUrl":"https://doi.org/10.5897/jece2022.0490","url":null,"abstract":"Since the Minamata conference","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114883871","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":"Evaluation of heavy metals on soil microflora diversity in Robertkiri, Idama and Jokka in Niger Delta Area of Nigeria","authors":"Okoro Duke, P. T. Ikyaahemba","doi":"10.5897/jece2021.0486","DOIUrl":"https://doi.org/10.5897/jece2021.0486","url":null,"abstract":"The increase in the population and industrial growth has led to increased production of industrial and domestic waste, which contains heavy metals in different forms, hence affect the diversity and activities of soil microflora and environmental sustainability. This research was aimed at evaluating the heavy metals on soil microflora diversity in soils of Robertkiri, Idama and Jokka in Akuku-Toru Local Government Area in River State Nigeria. Soil samples were collected randomly from each location at 0-15 and 15-30 cm depth, respectively. The heavy metal contents of soil were determined using standard methods, while the microbial analysis of samples was determined by the enumeration of total heterotrophic bacteria (THB) and fungi and hydrocarbon utilizing bacteria and fungi on plate count Agar at 37°C, and the count recorded after 4 h using standard methods. Results showed that Fe concentration was highest in the contaminated locations at 15-30 cm depth with values 1362.01, 894.01 and 674.11 mg/kg for Robertkiri, Idama and Jokka compared to 0-15 cm depth and the control. Similar trend was observed at 15-30 cm depth for Zn 33.61, 41.20 and 33.98 mg/kg within the study locations. Whereas Cu and Cr had lowest concentration of 0.49 and 0.78 mg/kg in Robertkiri, 0.74 and 1.17 mg/kg in Idama and 0.76 and 1.87 mg/kg in Jokka at 15-30 cm depth. The THB and total heterotrophic fungi (THF) count was relatively low and ranged between 0.59 and 2.85 cfu at 0-15 and 15-30 cm depth in Robertkiri and Idam. While at jokka, THB and THF count ranged between 0.23 and 1.94 cfu at 0-15 and 15-30 cm depth compared to control. Likewise, the hydrocarbon utilizing bacteria (HUB) and hydrocarbon utilizing fungi (HUF) count was found to be low across depth in all the three locations in relative to the control. The study revealed that there is a gradual accumulation of heavy metals and the concentration was high in the contaminated soils than the control. The low count of soil microflora in the study locations may be due to the high levels of heavy metals observed in the contaminated soils from different locations.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116602006","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":"Profiling the surface water around Odeama Community of the Niger Delta area of Nigeria","authors":"Okoro Duke, Chovwe Diejomaoh Lily","doi":"10.5897/jece2021.0485","DOIUrl":"https://doi.org/10.5897/jece2021.0485","url":null,"abstract":"Surface water quality in Niger Delta has been impaired over the years as a result of oil exploration and exploitation carried out in the region. This study investigates the anthropogenic influence on the water quality of Odeama creek. Water samples were collected during the wet and dry season from 20 sampling points and four control points and analyzed following standard methods and procedures. No statistical difference (p> 0.005) at 95% confidence interval was observed between sampling points except for nitrate values in the dry season. Some of the results observed in this study are: pH range of 7.1 - 8.0 and 7.12 - 8.3; dissolved oxygen, 4.8 - 5.4 and 2.12 - 3.69 mg/L; chemical oxygen demand, 4.8 -5.4L and 2.12 - 3.69 mg/L; polynuclear aromatic hydrocarbons, 0.01 - 0.17 and 0.05 - 1.06 mg/L for wet and dry season, respectively. Values observed from dissolved oxygen, chemical oxygen demand, polynuclear aromatic hydrocarbons, and heavy metals except copper indicated human influence on the water quality that may be due to domestic and industrial waste, illegal bunkering activities, and corrosion of abandoned vessels in the water-way. Regular monitoring of the physicochemical parameters and standard measures should be put in place to evaluate and control anthropogenic influence on the water quality.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127544900","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":"Trace metal pollution in the environment: A comparison of the bio-indicator concept in three bivalves","authors":"A. Fred","doi":"10.5897/jece2021.0480","DOIUrl":"https://doi.org/10.5897/jece2021.0480","url":null,"abstract":"Three bivalves from the coast of Ghana: Crassostrea tulipa (n = 275), Anadara (Senilia) senilis (n = 310), from two ‘open’ lagoons (Benya and Ningo) and a ‘closed’ lagoon (Sakumo), and Perna perna (n = 155), from rocky shores adjacent to Benya and Sakumo, were analyzed for their total Cu, Zn, Fe, Mn, Cd and Hg concentrations and total body burden/load. The analyses were based on three-size class from two seasons. Average concentrations for oysters (C. tulipa) were: 40, 1197, 477, 16, 0.57 and 0.15 μg/g dw respectively. Cd and Hg levels in dry season samples were higher than those in wet season. While Zn and Fe dry season levels were lower than wet season with no variation in Cu and Mn, average total body burden were: 16, 451, 178, 6.6, 0.25 and 0.11 μg respectively. Geographical variations observed were mostly due to size distribution rather than the ecological differences between stations. Factors observed to influence metal concentrations and accumulation in these organisms include; size, metal bioavailability, season of sampling, hydrodynamics of the environment and reproductive cycle. Element concentrations in bivalves at the same location differ between different species and individuals due to species-specific ability/capacity to regulate or accumulate trace metals. Log-transformed regression analyses between body burden and size were used to compare the species and stations. In addition, the results were compared within class and among classes.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125918207","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":"Health risk assessment of pesticide residues in bean samples from Wukari, Taraba State, Nigeria","authors":"O. Otitoju, Confidence Chibuikem Lewis","doi":"10.5897/JECE2019.0456","DOIUrl":"https://doi.org/10.5897/JECE2019.0456","url":null,"abstract":"Man depends heavily on pesticides to boost his agricultural productions. This study aimed at carrying out a risk assessment of pesticide residues in samples of beans stored and sold in Wukari Town, Nigeria. Different samples of beans were collected randomly from different market points within Wukari, Rafin kada and Idofi. The pesticide residue analysis was carried out using GC/MS after sample extraction, filtration and Concentration. The mean estimated consumption rate of beans within Wukari was obtained. The concentrations of each pesticide were compared with their Maximum Residue Levels (MRLs) and the Estimated Daily Intake (EDI) along with the Health Risk Index (HRI) of each pesticide. The results showed that all bean samples analyzed contained some organochlorine pesticides, organophosphates and pyrethroids. The mean consumption rate of beans was found to be 0.624±0.052 kg/day. The calculated Health Risk Index (HRI) of some organochlorine pesticides occurred at ranges greater than 1. However, most of the pesticide residues occurred below critical HRI. Aldrin was detected in all samples analyzed and p,p’-DDT occurred the least with calculated HRI above 1. The presence of organochlorine pesticide residues in all samples analyzed is suggestive of the continuous use of obsolete banned pesticides in the cultivation and storage of agricultural products. HRI values above 1 indicates that the life time consumption of beans containing the measured level of pesticide could pose a non-carcinogenic health risk for adult consumers. Therefore strict enforcement of regulatory measures by policy makers on how to manage the use of pesticides is well recommended. \u0000 \u0000 Key words: Risk assessment, beans, pesticides, residues, Wukari, health risk.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125252995","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":"Energy dispersive X-Ray fluorescence determination of minor and major elements in soils of Mambilla Plateau Northeastern Nigeria","authors":"E. Isaac, O. Maitera, R. B. Donatus, Y. Riki, E. Yerima, K. Tadzabia, B. Joseph","doi":"10.5897/JECE2018.0442","DOIUrl":"https://doi.org/10.5897/JECE2018.0442","url":null,"abstract":"This study focuses on energy dispersive X-ray fluorescence determination of minor and major elements in selected soils of Mambilla Plateau. The 12 sampled soil composites analysed were done by energy dispersive X-ray fluorescence technique for minor and major elements. The elemental oxides determined were Al2O3, CaO, K2O, TiO2, SiO2, BaO, Fe2O3, and MnO. The result obtained in the study showed that the general percentage concentration of elemental values were in decreased order of Si>Al>Ti>K>Ca for major elements and Fe>Mn>Ba minor elements accordingly. The major elements category showed silicon as the highest mean concentration at location S 84.09%±6.40 and calcium lower mean concentration with value of 0.32%±0.02. The minor elements concentration percentage revealed Fe with a mean value at location N 23.18%±3.1 being the highest and Ba is the lowest at location S 0.14%±0.1. The soil analysis revealed low concentration of essential major and minor elements, however, high concentration of Al and Fe that may solubilized at low pH and splitting H+ from water molecule showed increased soil acidity. \u0000 \u0000 Key words: Energy dispersive X-ray fluorescence (EDXRF), minor elements, major elements, percentage, Mambilla Plateau.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127996720","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":"Groundwater quality distribution by geostatistical investigation (GIS), Nile Delta, Northern Egypt","authors":"Mohamed ElKashouty","doi":"10.5897/JECE2018.0437","DOIUrl":"https://doi.org/10.5897/JECE2018.0437","url":null,"abstract":"The Nile Delta represents two-thirds of agricultural output with low precipitation and population growth that depletes the groundwater. The Quaternary aquifer is consisted of Holocene (aquitard) underlain by Pleistocene (aquifer), and groundwater flows from south to north, northwest, and northeast directions. The total dissolved solids (TDS) concentration increases toward the western and northeastern part in 1997 by seawater intrusion and irrigation practices. The TDS concentration anomalies were in the north and east, and are attributed to pumping within 2003, 2010, and 2013 periods. There is a good match between hydrogeochemistry (TDS content) and hydrogeology (groundwater flow) with the TDS concentration change found to decline mainly in the southwestern and northeastern part within 1997, 2003, and 2013 periods. The TDS concentration change declines toward the northern part of the eastern Nile Delta by increase in potentiometric surface from the River Nile in 2010. The geostatistical application (GIS) is used to determine the groundwater quality and hydrogeochemical parameters distribution, which is accomplished by ordinary kriging. The first produced map is the default options, while the next map (2nd) incorporated more of the spatial relationships constructed. When the latter is estimated, the exploratory spatial data investigation (ESDA) techniques check parameters extent. Trends were deleted and spatial autocorrelation was modeled. The ESDA and geostatistical techniques were used and the surfaces of the major ions were found more accurate. The third surface showed critical probability that TDS concentration threshold point increase drinking and irrigation purposes in the northeastern part and decrease in the southwestern parts of the Nile Delta. The default kriging is the best for mapping the hydrogeochemical parameters. \u0000 \u0000 Key words: Total dissolved solids (TDS) change, major ions, geostatistical tools, GIS, Nile Delta.","PeriodicalId":254567,"journal":{"name":"Journal of Environmental Chemistry and Ecotoxicology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131541752","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}