Journal of Chemistry最新文献

{"title":"Retracted: Differential Scanning Calorimetry Material Studies: Benzil Melting Point Method for Eliminating the Thermal History of DSC","authors":"Journal of Chemistry","doi":"10.1155/2023/9764037","DOIUrl":"https://doi.org/10.1155/2023/9764037","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"19 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139213760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retracted: Sedimentary Facies Evaluation of Tight Oil Reservoirs of Yanchang Formation in the Ordos Basin","authors":"Journal of Chemistry","doi":"10.1155/2023/9785450","DOIUrl":"https://doi.org/10.1155/2023/9785450","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"45 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139213016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retracted: Characteristics of Sedimentary Microfacies of Late Triassic Yanchang Formation in North-Central Ordos Basin","authors":"Journal of Chemistry","doi":"10.1155/2023/9891764","DOIUrl":"https://doi.org/10.1155/2023/9891764","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"48 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139211351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retracted: Integrated Design Technology of Geological Engineering for Pressure Flooding and Water Injection in Low Permeability Reservoirs: Take the Reservoir of Keshang Formation in Wu2 East Area as an Example","authors":"Journal of Chemistry","doi":"10.1155/2023/9819656","DOIUrl":"https://doi.org/10.1155/2023/9819656","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"24 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139214799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retracted: Bioactivation of Polyaniline for Biomedical Applications and Metal Oxide Composites","authors":"Journal of Chemistry","doi":"10.1155/2023/9831807","DOIUrl":"https://doi.org/10.1155/2023/9831807","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"316 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139214015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retracted: Prediction of Chemical Corrosion Rate and Remaining Life of Buried Oil and Gas Pipelines in Changqing Gas Field","authors":"Journal of Chemistry","doi":"10.1155/2023/9837090","DOIUrl":"https://doi.org/10.1155/2023/9837090","url":null,"abstract":"<jats:p />","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"24 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139215097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of Some Selected Heavy Metals in Effluents from Lubricants Manufacturing and Associated Contamination of Oysters (Crassostrea cucullata) and Soil near Discharge Points in Mombasa, Kenya","authors":"Simiyu Wechuli, Daniel Munga, R. Magwa","doi":"10.47672/jchem.1663","DOIUrl":"https://doi.org/10.47672/jchem.1663","url":null,"abstract":"Purpose: Available reports on heavy metal contamination along the Kenyan coastal zone focused on concentration levels in marine and coastal waters, sediments and biota, with indications of potential sources. However, information on contribution of specific sources to the heavy metal load into the marine and coastal environment is scanty or unavailable. Thus, this study addressed the need to assess specific potential sources and their contribution to heavy metal contamination. The generated data can be applied for monitoring discharge loads of heavy metals from lubricant manufacturing processes into the environment, its level of contamination to the environment and the potential risk to man through food chain. Materials and Methods: Concentrations of selected heavy metals Cd, Cr, Cu, Pb, and Hg in effluents filtrates, residues (SPM), Oysters (Crassostrea cucullata) and soil samples were determined using ICP-OES. The procedures of the analytical methods and instruments used were validated with analysis of a multi-element certified reference material (CRM IAEA-452) for the elements Cd, Cr, Cu, Pb and Hg in the effluent samples and standard reference material (SRM 1566b) from National institute standards and technology for the elements Cd, Cr, Cu, Pb and Hg in the marine bivalve tissues. Physico – chemical parameters Temperature, PH, Conductivity, Dissolved oxygen and Total organic carbon were also determined in the effluent samples.  Sampling was done in the year 2021 and 2022. Effluent samples were collected from OLA energy Kenya limited, VIVO energy Kenya limited and TOTAL energy Kenya limited. Oyster samples and soil sediment samples were collected from Makupa creek. Data analysis was carried out using (SPSS) for Windows (Version 16) and one way analysis of variance (ANOVA) at 95% confidence level. The difference in mean concentrations of heavy metals within and between groups were considered significant at P˂0.05. The interrelationships of heavy metals contamination in the samples were determined using the Pearson correlation coefficient. It was considered significant at P value ˂0.05. Findings: This study showed presence of heavy metals that varied in concentrations in effluents samples, soils samples and Oyster samples. The mean concentrations of heavy metals in the effluents filtrates ranged as follows Pb = 0.0038±0.0004 mg/l – 0.0025 ± 0.003 mg/l, Cu = 0.0054±0.0038 mg/l – 0.0019±0.0002 mg/l, Cr = 0.0071±0.0021mg/l – 0.0045±0.0022 mg/l, Cd = 0.0041±0.0026 mg/l – 0.0013±0.0001 mg/l and Hg = 0.0063±0.0018 mg/l – 0.0026±0.0004 mg/l. The range of values for the mean concentrations of the heavy metals in the Oysters showed that Pb = 0.0227±0.0091mg/kg – 0.019 ± 0.006 mg/kg, Cu = 0.0618±0.0171mg/kg – 0.0601±0.0168 mg/kg, Cr = 0.0265 ± 0.0277 mg/kg – 0.0152 ± 0.0009 mg/kg, Cd = 0.0464±0.0282 mg/kg – 0.0273 ± 0.0117 mg/kg and Hg = 0.0264±0.0158 mg/kg – 0.025±0.0080 mg/kg. The range of values for the mean concentrations of the heavy metals in the s","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"27 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139236541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Silver Nanoparticles Based on Fresh Cocoa Pods (Theobroma Cacao) Extracts as New Potential Electrode Material","authors":"Alex Vincent Somba, Evangéline Njanja, Gullit Deffo, Cyrille Ghislain Fotsop, Kevin Yemele Tajeu, Armel Florian Tchangou Njiemou, François Eya’ane Meva, Theophile Kamgaing","doi":"10.1155/2023/6447994","DOIUrl":"https://doi.org/10.1155/2023/6447994","url":null,"abstract":"This work focuses on the synthesis of silver nanoparticles using fresh cocoa pods from the “<i>Theobroma cacao</i>” extract plant through the reduction of silver ions (Ag⁺) into Ag (0) by a green chemistry process, subsequently used as an electrode material. Reaction factors such as pH, incubation time, and silver ion concentration were optimized during the formation of nanoparticles. The synthesized nanoparticles were characterized by ultraviolet spectrophotometry (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometry (EDX) analysis. Once drop coating was applied on the glassy carbon electrode (GCE), the resulting film was characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that silver nanoparticles have been well synthesized and can find applications as electrode materials for simultaneous determination of ascorbic acid and uric acid in aqueous solution.","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"19 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anthropogenic Sources and Risk Assessment of Heavy Metals in Mine Soils: A Case Study of Bontesso in Amansie West District of Ghana","authors":"Douglas Siaw Baah, Emmanuel Gikunoo, Emmanuel Kwesi Arthur, Frank Ofori Agyemang, Gordon Foli, Bennetta Koomson, Philipa Opoku","doi":"10.1155/2023/6760154","DOIUrl":"https://doi.org/10.1155/2023/6760154","url":null,"abstract":"Contamination of the environmental receptors with heavy metals due to mining is a major topical environmental issue in Ghana. This research investigates the possible ecological and human health risks of heavy metal impacts due to mining in the Amansie West District in Ghana. A total of 18 soil samples were taken from the Bontesso illegal mining site in the district and analyzed for the levels of arsenic (As), cadmium (Cd), copper (Cu), nickel (Ni), and lead (Pb) using atomic absorption spectrometry (AAS). From principal component analysis, cluster analysis, and correlation coefficient analysis, the metals are derived from multiple sources, with substantial levels of correlations. Using geo-accumulation index (<i>I</i>_geo), contamination factor (CF), degree of contamination (<i>C</i>_<i>d</i>), pollution load index (PLI), ecological risk index (Er), and noncarcinogenic and carcinogenic risks, respectively, the impacts of As (12.2 mg/kg) and Cd (1.3 mg/kg) are above the WHO stipulated limit. Findings for pollution indices indicate moderate contamination, while HQ &lt; 1 for inhalation and dermal exposure route, except for ingestion which is HQ &gt; 1. Based on the USEPA standard, the carcinogenic risk of the pollutants for humans is higher than the range of 1 × 10⁻⁶ to 1 × 10⁻⁴. Furthermore, the ingestion route represents the highest contributor to cancer risk with arsenic posing the greatest risk. The results so far suggest that chemical components gradually accumulate and thus emphasize the importance of implementing the necessary mitigation methods to minimize the impacts of illegal mining activities in the study area.","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"27 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extraction and Optimization of Tanning Material from Osyris lanceolata Barks: Cleaner Leather Tanning Processing","authors":"Zerihun Teshome, Tesfaye Agazhi, Tale Gashew, Biniyam Solomon, Tsion Belay, Belete Baye, Efrem Temach","doi":"10.1155/2023/6610247","DOIUrl":"https://doi.org/10.1155/2023/6610247","url":null,"abstract":"Tanning is a processing mechanism that prevents the collagen fibers from putrefaction to maximize the hydrothermal stability of leather. Tannin agents extracted from plants were used in leather production in a process called vegetable tanning. Vegetable tanning is an eco-friendly tanning method when compared to chrome tanning. Chrome tanning is the most common method of tanning hides. Currently, chrome tanning, which is extracted from chrome ores, is used in more than 80–90% of the leather tanning industry, but the most serious environmental issue associated with tanneries is chromium. This implies that the presence of chromium both in wastewater and in leather waste has a significant environmental impact and a high cost for landfills. However, currently, vegetable tanning and other tanning materials take up a 10–20% share of the leather tanning industry. Even today, most commercial vegetable tanning is a mimosa. In this study, a new alternative material and chrome-free tanning process using the barks of the Osyris lanceolata plant barks which reduces the environmental pollution load in terms of wastewater and solid wastes would be introduced. The study also aimed to improve the extraction and optimization mechanisms of tannin material from the bark of the Osyris lanceolata plant, which grows in Dera Hamusit Woreda in Ethiopia’s south Gonder Amhara region. In addition to these, the chemical and physical properties of experimentally treated leather were analyzed. This study’s results show that the bark of Osyris lanceolata contains (18.72%) tannin with 96% tanning strength (96%), and 49 percent purity. Also, leather treated with this tannin showed good shrinkage temperature (84.5°C), and organoleptic properties results such as tensile strength, tear strength, and elongation were 7.1 N/mm2, 19 N, and 45%, respectively. Besides that, the FTIR analysis shows that the bark of the Osyris lanceolata plant has a phenolic compound that is used for tanning purposes. This study clearly shows that extracted tannin from Osyris lanceolata has the potential to be used as an alternative tannin material in the leather tanning industry.","PeriodicalId":15348,"journal":{"name":"Journal of Chemistry","volume":"116 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}