检索结果-南通市图书馆

Evaluation of Some Selected Metals in Rice Cultivated in Four Local Government Areas in Enugu State, Nigeria

Journal of Geoscience and Environment Protection 2023年第11期11卷 141-150页

作者： Christopher O. Alisa Samuel C. Nwobodo Edith N. Alisa Peter C. Okeke Ali Bilar jailen doyle Lovell Agwaramgbo Department of Chemistry Federal University of Technology Owerri Nigeria Department of Zoology and Environmental Biology University of Nigeria Nsukka Nigeria Opec Research Consult Awka Nigeria Chemistry Department Dillard University New Orleans Louisiana USA

In this study, we investigated the presence of Zn, Fe, Cu, and Ca in rice cultivated in four local government areas (Nkanu East, Aninri, Uzo Uwani, Isi Uzo) within Enugu state, Nigeria. We employed an Atomic Absorption Spectrometer with an air acetylene flame to analyze these metals after digesting the rice samples. Risk assessment studies were carried out to determine any potential health risk to consumers by evaluating the estimated daily intake (EDI), the target hazard quotient (THQ) and hazard index (HI). The average concentration (mg/kg) of trace metals in the rice samples was within the acceptable limits established by FAO/WHO. Specifically, Zn ranged from 0.265 to 0.632 mg/kg, Fe from 2.73 to 4.131 mg/kg, Cu from 0.205 to 4.131 mg/kg, and Ca from 9.718 to 12.150 mg/kg. There were no statistically significant differences in metal concentrations among the various locations. Consequently, the rice analyzed in this study can be considered safe for consumption. The calculated EDI (mg/kg-day) values were below the maximum tolerable daily intake thresholds. THQ values also fell within safe levels, and the HI values were less than 1, signifying no potential health risks associated with consuming rice from these locations. In conclusion, there is no significant non-carcinogenic health risk associated with exposure to trace metals through the consumption of rice from these areas.

关键词： Trace Metals Rice Risk Assessment Target Hazard Quotient Hazard Index Enugu

来源：

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Comparative Evaluation of Calcium, Magnesium, Copper and Zinc Removal by Wood Ash, Sodium Carbonate and Sodium Hydrogen Phosphate

引用

Journal of Environmental Protection 2021年第7期12卷 454-461页

作者： Lovell Agwaramgbo jailen doyle Corneisja Harrison Honour Williams Chemistry Department Dillard University New Orleans USA

Remediation via adsorption process has been proven to be one of the best water treatment technologies globally. Many adsorbents, including agricultural wastes, have been considered for the removal of a variety of pollutants from water. However, most of the studies reported in the literature used metal concentrations below 1000 ppm. It is also known that initial metal concentrations in polluted aqueous solutions, as well as metal and adsorbent type, are some of the factors that affect metal removal. Therefore, this project examined the remediation of water contaminated by 1000 ppm of lead, zinc, copper, magnesium, and calcium ions using wood ash, sodium hydrogen phosphate (dibasic), and sodium carbonate (dibasic). Comparative analysis of the results showed the order of order of metal removal by the adsorbents as: dibasic phosphate (Ca > Cu > Pb > Zn > Mg);dibasic Carbonate (Pb ~ Ca > Zn > Cu > Mg);Wood ash (Mg > Cu > Zn > Pb > Ca). These results suggest that metal and adsorbent type as well as the inherent chemical properties of these metal cations may contribute to the varying binding affinity of the metals to the adsorbent ligand(s) and thus, affect the extent of metal removal. It is equally worthy to note that wood ash more effectively removed hardness metals (Mg and Ca) from water than the inorganic phosphate and carbonate ions.

关键词： Phytoremediation Metal Adsorption Water Hardness Heavy Metal Contamination

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Examining Adsorbent Charge Effect on Metal Removal from Contaminated Water

引用

Journal of Environmental Science and Engineering(A) 2022年第6期11卷 201-205页

作者： Lovell Agwaramgbo Christopher O.Alisa jailen doyle Department of Chemistry Dillard UniversityNew OrleansLouisiana 70131USA Department of Chemistry Federal University of TechnologyOwerri PMB 1526Imo StateNigeria

Heavy metal contaminated water sources can cause serious health problems for humans,animals,and *** metals can lead to the decrease or loss of liver,kidney,and brain ***:The aim of this research is to examine the effect of charge on adsorbents in the removal of metal *** Design&Methods:Standard solutions of Ca,Cu,Pb,and Zn with concentrations of 1,000 ppm were treated with sodium carbonate and sodium phosphate with various ***,the solutions were placed on a shaker for 24 h,centrifuged,and the supernatant was analyzed using ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrometry).Results:The order of average metal removal by sodium phosphates is:dibasic(99.3%)>monobasic(96.5%)>tribasic(95.4%).The average metal removal by sodium carbonate and bicarbonate is 98.5% and 96.4% ***:The adsorbent removability depends on the relationship between the charge present on the metal and the charge on the ***,metal cations in this study with a+2 charge had a greater affinity for the adsorbent with-2 charged ligands,dibasic sodium phosphate and sodium carbonate.

关键词： Charge effect environmental chemistry ion exchange metals solubility contaminated water

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Edible Plants:The Magic Wand for Inhibition of Oxidation of Organic Compounds,Remediators of TNT and Adsorbents for Heavy Metals

引用

Journal of Environmental Science and Engineering(A) 2023年第2期12卷 68-76页

作者： Lovell Agwaramgbo Protiti Khan jailen doyle Christopher O.Alisa Kendall Wise Chemistry Department Dillard University New OrleansLouisiana 70127USA University of Manitoba WinnipegManitoba R3T 2N2Canada Federal University of Technology OwerriNigeria

Phytoremediation is a viable,effective,and economically attractive technology that uses plants to remove chemical contaminants from soil and groundwater.A major munitions contaminant,TNT(2,4,6-Trinitrotoluene)can be remediated by several plants such as Myriophyllum aquaticum(Parrot Feather),and Catharanthus *** study focuses on screening plants that have natural antioxidant phytochemicals for their ability to remediate TNT,and heavy metals from contaminated water sources,groundwater and *** kinds of bell peppers,Capsicum frutescens(green,red,and yellow),which contain both the antioxidant phytochemicals(carotene and vitamin C)and tomato,which also contains vitamin C,were tested to confirm their antioxidizing and remediation abilities *** for remediation abilities were analyzed by HPLC(High Performance Liquid Chromatography).Results also suggested that plants which had antioxidant properties were also able to remediate TNT and heavy metals effectively,thereby suggesting a possible correlation between antioxidant and phytoremediation abilities of the plants studied.

关键词： Phytoremediation antioxidation heavy metal remediation TNT remediation.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Antioxidant Activity and Phenolic Content of Okoubaka aubrevillei (Anunuebe) Fruit Pychnobotrya nitida (Osu) Leaf Extracts

引用

Journal of Environmental Science and Engineering(B) 2022年第5期11卷 206-212页

作者： Christopher O.Alisa Edith NOkoye Peter C.Okeke Sylvia O.Anyadogh-Nwadike Lovell A.gwaramgbo jailen doyle Department of Chemistry Federal University of TechnologyP.M.B 1526 OwerriNigeria Department of Biotechnology Federal University of TechnologyP.M.B 1526 OwerriNigeria Opec Research Consult AwkaAnambraNigeria Department of Chemistry Dillard UniversityNew OrleansLouisianaUSA

The antioxidant activity and the total phenolic content of Okoubaka aubrevillei(Anunuebe)and Pychnobotrya nitida(Osu)plant extracts were investigated in this study to justify their ethno medicinal *** antioxidant activity of crude extracts of both plants was investigated using the scavenging effect on DPPH(2,2-Diphenyl-1-Picrylhydrazyl Radical)assay,while the total phenolic content was determined by the Folin-Ciocalteu reagent *** compared to standard drug vitamin C at various concentrations,both extracts exhibited potent antioxidant activity that increased with increasing concentration of *** high positive linear correlation between the antioxidant capacity and the total phenolic content suggests that the antioxidant capacity of both plants can be largely attributed to their phenolic *** on these findings,*** fruit and *** leaf could be potential natural antioxidant sources for preventing free radical-induced diseases.

关键词： Medicinal plants Okoubaka aubrevillei Pychnobotrya nitida phenolic content antioxidant capacity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：