Science Journal of Chemistry最新文献_第3页

Determination of Toxic and Trace Heavy Metals in the Soil of Two Different Dumpsites: A Case Study of Ojota and Oko Filling Dumpsites, Lagos State 两种不同垃圾场土壤中有毒和微量重金属的测定:以拉各斯州Ojota和Oko填埋垃圾场为例

Science Journal of Chemistry Pub Date : 2023-04-13 DOI: 10.11648/j.sjc.20231102.12

Moronkola Bridget Adekeni, Alegbe Monday John, Okpala-Chunonso Angela, Adewusi Anuoluwapo

{"title":"Determination of Toxic and Trace Heavy Metals in the Soil of Two Different Dumpsites: A Case Study of Ojota and Oko Filling Dumpsites, Lagos State","authors":"Moronkola Bridget Adekeni, Alegbe Monday John, Okpala-Chunonso Angela, Adewusi Anuoluwapo","doi":"10.11648/j.sjc.20231102.12","DOIUrl":"https://doi.org/10.11648/j.sjc.20231102.12","url":null,"abstract":": Heavy metals are metallic elements with a relatively high density that are dangerous or hazardous at low concentrations and pose a serious threat to people and the environment. The purpose of this research is to ascertain the concentrations of heavy and trace metals in the Lagos State communities of Ojota and Oko Filling. The soil samples taken from the dumpsites were treated using the digestion process. After being placed into a sampling vial, the mixed solution from the digestion process was then taken for measurement using inductively coupled plasma optical emission spectroscopy (ICP-OES). Samples taken from the dumpsites at Ojota and Igando contained 12.52% and 4.44% of moisture, respectively. The analysis's findings showed that the average concentrations of Fe (42.429 mg/L), Zn (2.070 mg/L), Ca (7.140 mg/L), P (9.06 mg/L), Cd (0.022 mg/L), Cr (0.042 mg/L), Cu (0.135 mg/L), Pb (1.280 mg/L), and Ni (0.123 mg/L) at the Ojota dumpsite were all within the WHO/FAO standards' tolerable limits and did not pose any risk. While, Fe (94.784 mg/L), Zn (11.564 mg/L), Ca (45.243 mg/L), Cd (2.838 mg/L), Cr (0.046 mg/L), Cu (0.215 mg/L), and Ni (0.22 mg/L) are the mean concentrations, respectively. In conclusion, the results from the Oko – filling dumpsites shows that the heavy metals from the soil is highly toxic and are such harmful to the environment and detrimental to human life than Ojota dumpsites.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88110286","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}

引用次数: 0

Kinetics and Thermodynamic Study of the Acetylation of Cucumeropsis mannii Seed Shell 黄瓜籽壳乙酰化反应的动力学和热力学研究

Science Journal of Chemistry Pub Date : 2023-03-31 DOI: 10.11648/j.sjc.20231102.11

Amalachukwu Ifeyinwa Obi, Vincent Ismael Egbulefu Ajiwe, Ozioma Juliana Anekwe, Emeka Christian Ezeudu, Cecilia Nkemjika Aduaka

{"title":"Kinetics and Thermodynamic Study of the Acetylation of <i>Cucumeropsis mannii </i>Seed Shell","authors":"Amalachukwu Ifeyinwa Obi, Vincent Ismael Egbulefu Ajiwe, Ozioma Juliana Anekwe, Emeka Christian Ezeudu, Cecilia Nkemjika Aduaka","doi":"10.11648/j.sjc.20231102.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20231102.11","url":null,"abstract":": The use of lignocellulosic materials for oil sorption from aqueous medium has directed attention to acetylation as a means of increasing the hydrophobicity of these materials. In this paper, acetylation of Cucumeropsis mannii seed shell, a readily available agricultural waste, was studied. Effects of different acetylation conditions on the extent of acetylation of the seed shell was investigated. The kinetics of the acetylation process was studied using pseudo first order, pseudo second order, and intraparticle diffusion models. The thermodynamics of the acetylation process was also studied. FTIR analysis provided evidence of successful acetylation of the seed shell. The extent of acetylation increased with increase in acetylation duration, temperature and catalyst concentration. Pseudo second order kinetics best described the acetylation process, with minimum extent of acetylation and rate constant values of 0.317 and -0.0148 min -1 , respectively. Thermodynamic studies revealed that the acetylation process was endothermic in nature. The critical extent of acetylation, heat capacity at constant pressure, and change in entropy values were 1.002, 0.162 kJ.mol -1 .K -1 , and 0.020 kJ.mol -1 .K -1 , respectively. The acetylation process was spontaneous at temperatures of 328 K ‒ 348 K, but non-spontaneous at lower temperatures (308 K and 318 K). The critical temperature of acetylation was 419 K, which shows that acetylation of CMSS can easily take place at mild conditions.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78815600","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}

引用次数: 0

Comparison of the Chemical Composition of L. schlechteri with Other Selected Green Leafy Vegetables 石氏乳酸菌与其他选定绿叶蔬菜的化学成分比较

Science Journal of Chemistry Pub Date : 2023-02-28 DOI: 10.11648/j.sjc.20231101.14

Arnaud Wenceslas Geoffroy Tamba Sompila, Nadia Pamela Gladys Pambou-Tobi, Roniche Nguie, Michel Elenga

引用次数: 0

Chemical Stability of Imidazole-Thiosemicarbazides in Solvents: NBO Studies and Theoretical Absorption Spectrum 咪唑-硫代氨基脲类化合物在溶剂中的化学稳定性:NBO研究和理论吸收光谱

Science Journal of Chemistry Pub Date : 2023-02-28 DOI: 10.11648/j.sjc.20231101.15

Mamadou Guy-Richard Koné, Adama Niaré, B. Ouattara, Georges Stéphane Dembélé, P. Karamanis, N. Ziao

引用次数: 0

Synthesis, Spectroscopic Characterization, and X-ray Structure of the Co-crystal Copper(II) Complex of the Dissymmetrical 1-(2 hydroxy-3-methoxybenzylidene)-5-(pyridin-2 ylmethylene) Carbnohydrazide Ligand 非对称1-(2羟基-3-甲氧基苄基)-5-(吡啶-2基亚甲基)羰基肼配体共晶铜配合物的合成、光谱表征和x射线结构

Science Journal of Chemistry Pub Date : 2023-02-14 DOI: 10.11648/j.sjc.20231101.13

Ndiouga Fall, B. Traoré, Mbossé Ndiaye-Guèye, O. Diouf, Ibrahima Elhadji Thiam, Simon C. Coles, J. Orton, M. Gaye

引用次数: 1

Study of the Chemical Reactivity of a Series of Dihydrothiophenone Derivatives by the Density Functional Theory (DFT) Method 用密度泛函(DFT)方法研究一系列二氢噻吩酮衍生物的化学反应性

Science Journal of Chemistry Pub Date : 2023-02-14 DOI: 10.11648/j.sjc.20231101.12

Fandia Konate, Kadjo François Kassi, Georges Stéphane Dembélé, Chiepi Nadege Dominique Dou, B. Konaté, Doh Soro, Guy-Richard Mamadou Kone, N. Ziao

引用次数: 0

Assessment of Heavy Metals (As, Cd, Hg, Pb) in Sources of Water for Human Consumption in Sub-Saharan Africa: A Literature Review 撒哈拉以南非洲地区人类饮用水源中重金属(As, Cd, Hg, Pb)的评估:文献综述

Science Journal of Chemistry Pub Date : 2023-01-30 DOI: 10.11648/j.sjc.20231101.11

Alassane Youssao Abdou Karim, E. Azokpota, Léonce Firmin Dovonon, Abdoul Kader Alassane Moussa, Alphonse Sako Avocefohoun, D. Mama, Dominique Codjo Koko Sohounhloue

引用次数: 0

A Review of Synthesis Methods of Chalcones, Flavonoids, and Coumarins 查尔酮类、黄酮类和香豆素类化合物的合成方法综述

Science Journal of Chemistry Pub Date : 2022-08-01 DOI: 10.11648/j.sjc.20221002.12

D. Mulugeta

引用次数: 4

Synergistic Antimicrobial Activities of Limonene with Mineral Carriers in LDPE Films for Active Packaging Application 活性包装用LDPE薄膜中柠檬烯与矿物载体的协同抗菌性能研究

Science Journal of Chemistry Pub Date : 2022-01-01 DOI: 10.11648/j.sjc.20221002.11

M. Darvish, A. Ajji

引用次数: 4

Effect of Polypropylene Microplastics Concentration on Wastewater Denitrification 聚丙烯微塑料浓度对废水脱氮的影响

Science Journal of Chemistry Pub Date : 2022-01-01 DOI: 10.11648/j.sjc.20221003.11

Xiongshuang Su, Cheng Chen, Jia Li, Shunxing Lu, Guihua Xu

{"title":"Effect of Polypropylene Microplastics Concentration on Wastewater Denitrification","authors":"Xiongshuang Su, Cheng Chen, Jia Li, Shunxing Lu, Guihua Xu","doi":"10.11648/j.sjc.20221003.11","DOIUrl":"https://doi.org/10.11648/j.sjc.20221003.11","url":null,"abstract":": Microplastics have been ubiquitously in the environment, and a large number of microplastics have entered wastewater treatment plants, and their effects on activated sludge denitrification are rarely reported. Polypropylene (PP) microplastics were selected as the research object for denitrification research. Herein, we set different concentrations of PP microplastics to study their effect on sewage denitrification. Several indicators including NO 3- -N, NO 2- -N, Total-N (TN), extracellular polymer substances, Zeta potential, and N 2 O production, etc., were employed to evaluate the denitrification effect. Results demonstrated that the denitrification process was affected by the concentration of PP microplastics. Its concentration may damage the denitrification of sludge, especially in low concentrations, due to its slowing down the NO 2- -N reduction process. Meanwhile, it will release an amount of greenhouse gas N 2 O as the concentration is positively correlated. However, the removal of NO 3- -N is almost unaffected in different concentrations of PP microplastics during the denitrification process. When the concentration of PP microplastics reached 60 mg L -1 , the accumulation of NO 2- -N in the effluent increased significantly. Accordingly, the extracellular polymer and potential indicators also showed that PP microplastics will reduce the flocculation capacity of the sludge, resulting in a decrease in the denitrification efficiency of the sludge overall. When the concentration of PP microplastics exceeded 100 mg L -1 , the impact of microplastics on denitrification water quality indicators was relatively small, but it will increase the N 2 O emission with a negative impact. In addition, the activated sludge denitrification pathway can be affected by the addition of different microplastics and requires further investigations in the future.","PeriodicalId":21607,"journal":{"name":"Science Journal of Chemistry","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90789684","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}

引用次数: 3