检索结果-南通市图书馆

Effects of Wastewater Discharge on Heavy Metals pollution in Fadama soils in Kano City, Nigeria

Biomedical and Environmental Sciences 2007年第1期20卷 70-77页

作者： S.A.MASHI M.M.ALHASSAN Department of Geography University of Abuja PMB 117 Abuja NIGERIA

Objective To present the results of a research project on 6 heavy metals （Cd, Cu, Zn, Pb, Hg, and Cr） at 30 Fadama fields scattered around Kano. Methods Following a reconnaissance conducted, 30 representative Fadama lands being irrigated with wastewater were selected from zones of the city under residential, industrial, commercial, and mixed but largely residential landuses. Five additional Fadama lands not being irrigated with wastewater were selected to serve as control. Using grid sampling procedure, soil samples were selected from 0-15 cm and 20-30 cm depths and analyzed for the above listed heavy metals using atomic absorption spectrophotometry. T-test was used to compare the mean values of the metals for the Fadama lands under different landuse zones with those of the control. Results Analyses of the soil data collected showed that the metals were concentrated in higher amounts in the lower （20-30 cm） than the upper （0-15 cm） depths, which was an indication of downward movement of the metals in profile of the soils. In the two soil depths, Zn was generally the most abundant, followed by Cr, then Pb, Cu, and Cd while Hg was the least. The Fadama soils in areas of mixed landuses with industrial as the dominant ones maintained the highest concentrations of the various metals. Conclusions These results indicate clearly that the Fadama soils are significantly polluted by industrial and household wastewater and that there is a particular threat from Cr and Pb pollution. There is also evidence that the metals are accumulating at lower layers of the soil profile, suggesting that not only plants and soil, but even water bodies could be under the threat of heavy metal pollution in the area.

关键词： Fadama Wastewater Heavy Metals soil pollution Kano City

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variations in cadmium and nitrate co-accumulation among water spinach genotypes and implications for screening safe genotypes for human consumptionVariations in cadmium and nitrate co-accumulation among water spinach genotypes and implications for screenin

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第2期19卷 147-158页

作者： Lin TANG Wei-jun LUO Zhen-li HE Hanumanth Kumar GURAJALA Yasir HAMID Kiran Yasmin KHAN Xiao-e YANG Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health College of Environmental and Resource Sciences Zhejiang University Indian River Research and Education Center Institute of Food and Agricultural SciencesUniversity of Florida

Vegetables are important constituents of the human diet. Heavy metals and nitrate are among the major contaminants of vegetables. Consumption of vegetables and fruits with accumulated heavy metals and nitrate has the potential to damage different body organs leading to unwanted effects. Breeding vegetables with low heavy metal and nitrate contaminants is a cost-effective approach. We investigated 38 water spinach genotypes for low Cd and nitrate co-accumulation. Four genotypes, i.e. JXDY, GZQL, XGDB, and B888, were found to have low co-accumulation of Cd （〈0.71 mg/kg dry weight） and nitrate （〈3100 mg/kg fresh weight） in the edible parts when grown in soils with moderate contamination of both Cd （1.10 mg/kg） and nitrate （235.2 mg/kg）. These genotypes should be appropriate with mini- mized risk to humans who consume them. The Cd levels in the edible parts of water spinach were positively correlated with the concentration of Pb or Zn, but Cd, Pb, or Zn was negatively correlated with P concentration. These results indicate that these three heavy metals may be absorbed into the plant in similar proportions or in combination, mini- mizing the influx to aerial parts. Increasing P fertilizer application rates appears to prevent heavy metal and nitrate translocation to shoot tissues and the edible parts of water spinach on co-contaminated soils.

关键词： Genotypic difference Heavy metal Nitrate soil pollution Water spinach

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The influence of old leather tannery district on chromium contamination of soils,water and plants

引用

Natural Science 2013年第2期5卷 253-258页

作者： Agnieszka Wolińska Zofia Stepniewska Rafal Wlosek Department of Biochemistry and Environmental Chemistry The John Paul II Catholic University of LublinInstitute of BiotechnologyLublinPoland

The paper demonstrates the actual level of chromium contamination at the site of the old tannery waste lagoon in Serniki community (SE Poland). Despite the fact that since 1994 this area is not exploited, the chromium presence is still detected in soil, water and plants. The current study is the 4th phase (after 1989, 2001 and 2004) of checking and controlling the chromium concentration in this territory. The chromium content was assessed after soil and plant mineralization using FAAS method. Total chromium concentrations in soil samples reached values of 2.25 - 18.25 mg·kg-1 dry mass. Levels of chromium in water samples ranged between 0.008 and 0.017 mg·dm-3 for Wieprz River and the trough, situated in the tannery centre, respectively. Absorption of chromium by plants depended from the plant species. The highest Cr content in the stalks of Oenothera biennis, whilst the lowest in Phragmites australis were detected. Finally, it was assumed that soil chromium content noted in 2009 was by 42% - 83% lower in relation to the data from 2004. Consequently, nowadays the tannery waste lagoon site is not so threat to the health of local residents and to the surrounding ecosystem.

关键词： Chromium soil pollution Tannery Wastes Chromium Accumulation

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

Bioavailability of Agricultural Pesticides on the Land Snails in the Commune of Kerou in the North of Benin

引用

Open Journal of soil Science 2019年第7期9卷 103-112页

作者： Fadéby Modeste Gouissi Afouda Esaie Adimi Department of Management of Natural Resources(AGRN) Water and Soil EngineeringFaculty of Agronomy(FA)University of Parakou(UP)ParakouBenin

The present study was conducted in the commune of Kérou in North Benin to measure the bioavailability of agricultural pesticides heavily used in the production of cotton on snails. The test was conducted in peasant environment in two villages of the commune. In each site, there are three cages containing 6 snails each. The snails are exposed to soil and plants without special protection and are therefore exposed to environmental conditions. Firstly it’s to evaluate the presence or absence of agricultural pesticides in the viscera of snails after exposure. Secondly it consists to compare the different doses found in the viscera of snails in the different sites. And finally it’s to evaluate the effect of the toxicity of the pesticides on the reproduction of snails. The tests consisted of placing steel cages in the two experimental sites. In each site, there are three cages containing 6 snails each. Snails are exposed to soil and plants without special protection and are therefore exposed to environmental conditions. The observations were made in order to establish a study of transfer kinetics. After the analysis of the data, it appears generally that the accumulation of mineral elements highlighted is not proportional to the mineralogical composition of the soil in which the snail is exposed. Total nitrogen and nitrate were significantly accumulated in the flesh of site 2 snails compared to site 1 snails. These different measures show the bioavailability of soil minerals for living organisms. Accumulations are not necessarily accompanied by toxic effects in terms of survival for snails after 28 days of exposure. However, the absence of immediate toxic effect on snails does not imply a lack of effect in food chains due to the trophic availability of contaminants. The use of snails as bio-indicator of soil quality has therefore proved relevant in the context of soils polluted by minerals.

关键词： Bioavailability Snail Agricultural Inputs soil pollution

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

Electrokinetics-magnetic/alkali Composite-modified Biochar for Remediation of Cd-contaminated soil

引用

Agricultural Biotechnology 2020年第5期9卷 49-53,72页

作者： Juan ZHAI Anwei WANG Juan LI Chengdong XU Yushan WAN College of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China

[Objectives]This study was conducted to explore the removal performance and mechanism of heavy metal Cd in soil by combining electrokinetic technology and modified biochar.[Methods]The electrokinetics-magnetic/alkali composite-modified biochar method was applied to remediate Cd-contaminated soil.[Results]When remediating the soil for 120 h under electric field strength of 2 V/cm with 0.1 mol/L citric acid as the electrolyte,the current periodically varied with the remediation ***^2+in the soil dissociated and migrated from the soil surface,and the addition of the magnetic/alkali composite-modified biochar in the cathode area affected the hydrolysis balance of heavy metal Cd^2+ions and maintained soil pH in a low *** exchangeable Cd content at the test sampling points near the cathode area was relatively high,and the organic Cd area was evenly *** average removal rate of Cd in the soil was up to 90.31%.The hexagonal anode device configuration enhanced the electromigration performance and made the soil pH and conductivity change within a certain range,which was beneficial to the migration of Cd2+and improved the removal rate of soil heavy metal Cd.[Conclusions]This study provides a theoretical basis for the treatment of soil heavy metal pollution and the resource utilization of composite-modified biochar.

关键词： Cd soil pollution Electrokinetics Biochar

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

Cost-Effective Strategy for the Investigation and Remediation of Polluted soil Using Geostatistics and a Genetic Algorithm Approach

引用

Journal of Environmental Protection 2016年第1期7卷 99-115页

作者： Yong-Qiang Cui Minoru Yoneda Yoko Shimada Yasuto Matsui Department of Environmental Engineering Graduate School of Engineering Kyoto University Kyoto Japan

The geostatistical technique of Kriging has extensively been used for the investigation and delineation of soil heavy metal pollution. Kriging is rarely used in practical circumstances, however, because the parameter values are difficult to decide and relatively optimal locations for further sampling are difficult to find. In this study, we used large numbers of assumed actual polluted fields (AAPFs) randomly generated by unconditional simulation (US) to assess the adjusted total fee (ATF), an assessment standard developed for balancing the correct treatment rate (CTR) and total fee (TF), based on a traditional strategy of systematic (or uniform) grid sampling (SGS) and Kriging. We found that a strategy using both SGS and Kriging was more cost-effective than a strategy using only SGS. Next, we used a genetic algorithm (GA) approach to find optimal locations for the additional sampling. We found that the optimized locations for the additional sampling were at the joint districts of polluted areas and unpolluted areas, where abundant SGS data appeared near the threshold value. This strategy was less helpful, however, when the pollution of polluted fields showed no spatial correlation.

关键词： Cost-Effective soil pollution Heavy Metals Investigation and Remediation Kriging Genetic Algorithm

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

Issue of Managing Waste Computer Equipment in Conakry City (Republic of Guinea)

引用

Journal of Environmental Protection 2024年第10期15卷 949-962页

作者： Fatoumata Sylla Saran Camara Adama Moussa Sakho Mamadou Kabirou Bah Alpha Issiaga Diallo Center for Environmental Studies and Research (CEER) BP 3817 Gamal Abdel Nasser University of Conakry Conakry Republic of Guinea Telecommunications Laboratory of the Polytechnic Institute Gamal Abdel Nasser University of Conakry Conakry Republic of Guinea Laboratory Techniques Department Higher Institute of Technology Mamou Republic of Guinea

The digitization of administrative activities is a technique that not only optimizes resources, but also professionalizes the working methods of public and private services. This dematerialization process involves technologies based on computer equipment, which, after use, becomes cumbersome waste. The aim targeted consisted of taking stock of the management of waste computer equipment imported into the Republic of Guinea, with a view of proposing a mode of environmentally sustainable management methods in a short time. To achieve this, the data was collected through investigation methods (observations, interviews, and questionnaires). This study reveals an excess of imports of electrical and electronic equipment in general, and computer equipment in particular, over the last ten years (2009-2019), With an import rate ranging from 4.03 to 54.45%. This study demonstrated the different ways in which computer and electronic equipment of all kinds are managed, with her failings. This study demonstrated the different ways in which computer and electronic equipment of all kinds are managed, as well as their failings. For this purpose, the different ways in which electronic waste is managed by different users were identified as storage, recycling, or rejection into nature or at waste storage points, often mixed with household waste. Companies specializing in the management of this type of waste and the presence of a certain number of regulatory texts almost do not exist. One company is only for the entire country but unknown to the majority of users.

关键词： Waste Computers Equipment soil pollution Water pollution Chemical Substances Management Methods

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

Phosphorus transport with runoff of simulated rainfall from purple-soil cropland of different surface conditions

引用

Journal of Chongqing University 2008年第2期7卷 85-92页

作者：高扬朱波 Institute of Mountain Hazards and Environment CAS

We investigated the patterns of phosphorus transport from purple-soil cropland of 5° and 10° slopes with bare and vegetated surfaces,*** type of land was tested under a simulated moderate rainfall of 0.33 mm/min,a downfall of 0.90 mm/min,and a rainstorm of 1.86 mm/*** dynamics and changes in the export amount of phosphorus are influenced by the rainfall intensity,the slope and surface conditions of *** vegetation diverts rain water from the surface into soil and helps the formation of a subsurface runoff,but has little influence on runoff process at the same sloping *** soil has a smaller phosphorous loss,particularly much less in the particulate form.A heavier rainfall flushes away more *** percolating soil carries more dissolved phosphorous than particulate *** the patterns of phosphorous transport under various conditions from purple soil in the middle of Sichuan basin is helpful for developing countermeasures against non-point-source pollution resulting in the eutrophication of water bodies in this region that could,if not controlled properly,deteriorate the water quality of the Three Gorges Reservoir.

关键词： phosphorus eutrophication runoff soil pollution rainfall simulation overland flow subsurface runoff phosphorus transport purple soil

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Macroplastics on soil-Plant System: Inhibiting Effects of Macroplastics on the Growth of Green Amaranth (<i>Amaranthus viridis</i>)

引用

American Journal of Plant Sciences 2021年第6期12卷 926-933页

作者： Marzan Ferdous Arifur Rahman Bhuiyan Khadiza Akter Tania Department of Environmental Science Faculty of Science and Technology Bangladesh University of Professionals Mirpur Cantonment Dhaka Bangladesh

In recent time Bangladesh faces a serious problem of soil pollution due to plastic contamination. However, the degree of the extent to which the effects of plastics on plant growth occur is not properly identified. An experiment was conducted to measure the effects of mixed plastic (polyethylene and disposable plastic glass) on the growth of Amaranthus viridis. Different doses of mixed plastics (T0, T1, T2, and T3) were applied with a fixed amount of soil for each of the treatments e.g., T0 (control), T1 (10 gm mixed plastics/3kg soil), T2 (15 gm mixed plastics/3kg soil) and T3 (20 gm mixed plastic/3kg soil), and the growth response of Amaranthus viridis against plastic was observed for six consecutive weeks. The growth was measured in terms of plant height and girth diameter. The results showed that the presence of mixed plastic had a significant effect on the growth of Amaranthus viridis and particularly in treatment T3 (3 kg soil/20gm mixed plastic), the plants showed a slower growth response compared to control and the rest of the treatments applied in case of both plant height as well as girth diameter. The statistical analysis (one-way Analysis of Variance) also proved the significance of the treatments (p-values < 0.05) for six consecutive weeks. The experiment was successfully able to set an index on which plastics had their effects on the growth of green amaranth. In addition, the obtained data will be helpful in future research of the study in determining the possible effects of plastic on plant growth viz. green amaranth.

关键词： Green Amaranth soil pollution Polyethylene Contamination Disposable Plastic Abiotic Stress Slow Growth of Plants

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

Study on the Passivation Effect of Ca-Si soil Conditioner on Heavy Metal Absorption by Rice

引用

Agricultural Biotechnology 2020年第3期9卷 104-106,112页

作者： Yupeng ZHANG Xiaoxiao TAN Xiaoyuan CHEN Jiahui LIANG Chongjian MA Yongjun GUO Jianbing ZHOU Henry Fok College of Biology and Agriculture Shaoguan UniversityShaoguan 512005China soil and Land Engineering Technology Research Center of North Guangdong Shaoguan 512005China Foshan Zhibao Ecological Technology Co.Ltd. Foshan 528000China

[Objectives] In order to solve the problem of heavy metal pollution in paddy fields,field experiments were carried out to study the effect of Ca-Si soil conditioner on heavy metal remediation in paddy fields. [Methods] A conventional planting mode( CK) was used as the control,and a Ca-Si soil conditioner( Ca-Si) treatment was set to analyze the differences in soil pH and heavy metal contents in different treatments. [Results]The content of cadmium in the paddy field exceeded the soil pollution risk control value of agricultural land by 59. 33%. The Ca-Si soil conditioner increased the pH value of paddy field soil by 0. 58 unit. The fixation rates of Ca-Si soil conditioner on chromium,arsenic,cadmium and plumbum reached 75. 96%,14. 09%,18. 93% and 7. 81% compared with the CK,respectively,and the available cadmium and lead contents were reduced by 82. 35% and 80. 00%,respectively. [Conclusions]This study provides ideas and references for the remediation of heavy metal pollution in paddy soil.

关键词： Conditioner Late rice soil pollution Passivation

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

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

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：