scholarly journals Effect of modified pomace on copper migration via riverbank soil in southwest China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11844
Author(s):  
Lingyuan Chen ◽  
Touqeer Abbas ◽  
Lin Yang ◽  
Yao Xu ◽  
Hongyan Deng ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Copper Content ◽  
Soil Column ◽  
Column Experiment ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Copper Accumulation ◽  
And Migration ◽  
Fruit Pomace ◽  
Iron Manganese

To explore the effects of modified pomace on copper migration via the soil on the banks of the rivers in northern Sichuan and Chongqing, fruit pomace (P) and ethylene diamine tetra-acetic acid (EDTA) modified P (EP) were evenly added (1% mass ratio) to the soil samples of Guanyuan, Nanbu, Jialing, and Hechuan from the Jialing River; Mianyang and Suining from the Fu River; and Guangan and Dazhou from the Qu River. The geochemical characteristics and migration rules of copper in different amended soils were simulated by column experiment. Results showed that the permeation time of copper in each soil column was categorized as EP-amended > P-amended > original soil, and the permeation time of amended soil samples at different locations was Jialing > Suining > Mianyang > Guangan > Dazhou > Nanbu > Guanyuan > Hechuan. Meanwhile, the average flow rate of copper in each soil column showed a reverse trend with the permeation time. Copper in exchangeable, carbonate, and iron–manganese oxide forms decreased with the increase of vertical depth in the soil column, among which the most evident decreases appeared in the carbonate-bonding form. The copper accumulation in different locations presented a trend of Jialing > Suining > Mianyang > Guangan > Dazhou > Nanbu > Guangyuan > Hechuan, and the copper content under the same soil showed EP-amended > P-amended > original soil. The copper proportion of the carbonate form was the highest in each soil sample, followed by the exchangeable form. The proportions of iron-manganese oxide and organic matter forms were relatively small. A significant correlation was observed between the cation exchange capacity and the copper content in exchangeable and carbonate forms. Moreover, total organic carbon and copper contents were negatively correlated.

scholarly journals Features of copper accumulation in the soils of different functional areas of Novokuybyshevsk

2019 ◽  
Vol 8 (2) ◽  
pp. 67-71
Author(s):  
Alexander Igorevich Startsev
Keyword(s):  
Urban Areas ◽  
Copper Content ◽  
Residential Area ◽  
Soil Samples ◽  
Anthropogenic Sources ◽  
Copper Accumulation ◽  
Test Plot ◽  
Oil Refineries ◽  
Functional Zones ◽  
Functional Areas

The vegetation of the Samara Region is characterized by a relatively high content of copper. This biogeochemical feature is typical for natural and technogenic transformed ecosystems of the region. Copper is included in the group of elements of the 2nd hazard class. At certain concentrations it is necessary for the normal functioning of all organisms, but with increasing concentrations in the environment or in food it shows toxicity. The technogenic sources of copper include metalworking and machine-building enterprises, fertilizers, road and rail transport, wastewater, products of incomplete fuel combustion and refining characteristic of the Samara Region. The peculiarities of copper accumulation and distribution in soils of urban areas of the region are insufficiently studied. Previously, such studies were carried out only in certain areas of Samara. The paper analyzes in detail the level of technogenic copper pollution of the soil cover in Novokuybyshevsk. Ecological and geochemical studies in Novokuybyshevsk were carried out for 3 years (2016-2018) on 7 stationary test plots in its different functional areas and on 1 background test plot. The objects of research were soil samples taken from the upper humus horizon (layer 0-10 cm). The quantitative content of copper in soil samples was determined by the method of inversion voltammetry. A comparative analysis revealed territories of Novokuybyshevsk with relatively high, medium and low levels of copper in the soil. The first group included the Park Dubki in its elevated part, the old residential area on Kirov Street, the roadside area at the intersection of Pobeda Avenue and Dzerzhinsky Street (93,3-90,7 mg/kg). The second group with an average copper content (71,0-73,3 mg/kg) included the square Elochki and a new residential area on Ostrovsky Street. The third group with a relatively low copper content (38,3-54,7 mg/kg) included three sample areas: the lowland part of the Park Dubki, the industrial zone and the background area. The concentration of copper in the soils of all studied functional zones in Novokuybyshevsk has not reached the level of approximate permissible concentration (APC), but more than the clark of the world soils and the background indicators. The downward trend in the concentration of copper in the soils of most of the studied functional zones of Novokuybyshevsk in 2018 compared with 2016 and 2017 at the relatively low level of copper content in soils of the industrial area of the city allows to exclude oil refineries from the list of its major anthropogenic sources.

Removal of Arsenic from Water Using a Composite of Iron–Manganese Oxide Incorporated Active Rice Husk Silica

2021 ◽  
Vol 49 (4) ◽  
pp. 2000233
Author(s):  
Trung Huu Bui ◽  
Van Sy Pham ◽  
Nguyen Thanh‐Nho ◽  
Quoc An Trieu
Keyword(s):  
Manganese Oxide ◽  
Rice Husk ◽  
Rice Husk Silica ◽  
Removal Of Arsenic ◽  
Iron Manganese

scholarly journals Author Correction: Hydrochar did not reduce rice paddy NH3 volatilization compared to pyrochar in a soil column experiment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaoyu Liu ◽  
Yueqin Cheng ◽  
Yang Liu ◽  
Danyan Chen ◽  
Yin Chen ◽  
...  
Keyword(s):  
Soil Column ◽  
Column Experiment ◽  
Rice Paddy ◽  
Nh3 Volatilization ◽  
Soil Column Experiment

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

scholarly journals Influence of long-term mineral fertilization on metal contents and properties of soil samples taken from different locations in Hesse, Germany

SOIL ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 23-33 ◽  
Author(s):  
S. Czarnecki ◽  
R.-A. Düring
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Agricultural Soils ◽  
Mineral Fertilizer ◽  
Fertilizer Application ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Residual Effects ◽  
Metal Contents

Abstract. Essential and non-essential metals occur in soils as a result of weathering, industrial processes, fertilization, and atmospheric deposition. Badly adapted cultivation of agricultural soils (declining pH value, application of unsuitable fertilizers) can enhance the mobility of metals and thereby increase their concentrations in agricultural products. As the enrichment of metals in soils occurs over long time periods, monitoring of the long-term impact of fertilization is necessary to assess metal accumulation in agricultural soils. The main objective of this study was to test the effects of different mineral fertilizer variations on soil properties (pH, Corg, and cation exchange capacity (CEC)) and pseudo-total and mobile metal contents of soils after 14 years of fertilizer application and to determine residual effects of the fertilization 8 years after cessation of fertilizer treatment. Soil samples were taken from a field experiment which was carried out at four different locations (210, 260, 360, and 620 m above sea level) in Hesse, Germany. During the study, a significant decrease in soil pH and an evident increase in soil carbon content and cation exchange capacity with fertilization were determined. The CEC of the soils was closely related to their organic C contents. Moreover, pseudo- and mobile metal (Cd, Cu, Mn, Pb, Zn) contents in the soils increased due to application of 14 years of mineral fertilizer treatments (N, P, NP, and NPK) when compared to control plots. Eight years after termination of the fertilization in the soil samples taken from soil profiles of the fertilized plots (NPK) for monitoring the residual effects of the fertilizer application, a decrease of 82.6, 54.2, 48.5, 74.4, and 56.9% in pseudo-total Cd, Cu, Mn, Pb, and Zn contents, respectively, was determined.

scholarly journals Soil chemical fertility in dairy farms of the Guanacaste volcanic mountain range, Costa Rica

2015 ◽  
Vol 7 (2) ◽  
pp. 157-163
Author(s):  
Alejandro Saborío-Montero ◽  
Osvaldo Marín-Taylor ◽  
Randall Arguedas-Sánchez ◽  
Sinaí Ramírez-Fallas
Keyword(s):  
Cation Exchange Capacity ◽  
Dairy Farms ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Mountain Range ◽  
Critical Levels ◽  
Mineral Deficiency ◽  
Charge Capacity ◽  
Soil Nutrition ◽  
Nutritional Needs

The aim of this research was to determine the fertility of soils of dairy farms at four zones of the Guanacaste volcanic mountain range. The study was conducted during a two-year period (2009-2010) in farms of Guayabo (Bagaces) and Nubes, San Ramón and Florida (Quebrada Grande, Tilarán). A total of 40 soil samples were collected, each one was composed by 20 sub- samples. The results revealed that soil pH in Guayabo tended to be lower (p=0.0539) than in Nubes, San Ramón and Florida. Guayabo soils showed higher concentrations (p<0.01) of magnesium (Mg), cupper (Cu), iron (Fe) and manganese (Mn) than the soils of the three zones of Tilarán. The soils of Guayabo and San Ramón showed higher values of effective cation exchange capacity (ECEC) (p<0.01) than Nubes and Florida soils. According to the general critical levels for the extracting solution used, none of the soils of the analyzed zones reach a pH higher than 5.5, the Tilarán and Guayabo soils were deficient in Mg and P respectively and no zone was deficient in Zn, Cu, Fe and Mn. These results revealed that the soils of all the zones had some mineral deficiency and low values of pH, therefore fertilizers and amendments should be applied according to nutritional needs of each farm. Adequate soil nutrition could improve productivity of forage and allowed a higher animal charge capacity per unit of area.

scholarly journals Physicochemical characteristics of cacao (Theobroma cacao L.) soils in Colombia: Are they adequate to improve productivity?

2019 ◽  
Vol 37 (1) ◽  
pp. 28-38
Author(s):  
Clara Esperanza León-Moreno ◽  
Jairo Rojas-Molina ◽  
Carlos E. Castilla-Campos
Keyword(s):  
Soil Compaction ◽  
Theobroma Cacao ◽  
Cation Exchange Capacity ◽  
Physicochemical Characteristics ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Physical Parameters ◽  
Reference Table ◽  
Independent Variables ◽  
Theobroma Cacao L

In Colombia, cacao farms are located mainly in areas with edaphoclimatic limitations. The predominant soil fertility characteristics from small cacao farms in 13 provinces were evaluated. A total of 635 soil samples (0-20 cm) were taken between 2011 and 2013 from the main cacao producer regions in Colombia. The number of samples was assigned based on the regional cacao production. The resulting data were analyzed with a linear regression model using pH as the dependent variable and soil chemical and physical parameters as the independent variables. Soil texture ranged between 14 and 40% clay, and 31 and 65% sand. Bulk density ranged between 1.07 and 1.28 Mg m-3 with a calculated porosity between 48.8 and 55.0%. There was no evidence of soil compaction. The national pH ranged between 3.9 and 7.9 and was negatively correlated with Al+3 content (R2 = 0.68) and Al saturation (R2 = 0.80) and redicts Al saturation in the range of available Al up to pH >5.2- 5.5. In this range, available P (as P2O5) was lower than 12 mg kg-1 and was accepted as a minimum value for a sustainable production. With 4.0 cmolc kg-1 of Ca and 60% saturation of the effective cation exchange capacity (ECEC). A minimum ECEC is proposed at 6.0 cmolc kg-1. A reference table for soils in Colombia is proposed as a guide for the establishment and management of productive and sustainable plantations.

Reduction of iron–manganese oxide particles in a lab-scale packed-bed reactor for thermochemical energy storage

2020 ◽  
Vol 221 ◽  
pp. 115700 ◽  
Author(s):  
Marziyeh Hamidi ◽  
Vincent M. Wheeler ◽  
Xiang Gao ◽  
John Pye ◽  
Kylie Catchpole ◽  
...  
Keyword(s):  
Energy Storage ◽  
Manganese Oxide ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Reduction Of Iron ◽  
Oxide Particles ◽  
Iron Manganese
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