Influence of removal of organic matter and iron and manganese oxides on cadmium adsorption by red paddy soil aggregates

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90588-90595 ◽  
Author(s):  
Zhongwu Li ◽  
Bin Huang ◽  
Jinquan Huang ◽  
Guiqiu Chen ◽  
Chang Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Paddy Soil ◽  
Manganese Oxides ◽  
Soil Aggregates ◽  
Cadmium Adsorption ◽  
Soil Components ◽  
Cd Adsorption ◽  
Iron And Manganese ◽  
Red Paddy Soil

Different soil components in various aggregates were selectively removed for evaluating their influence on Cd adsorption.

scholarly journals Fractionation of Selected Heavy Metals in Agricultural Soils / Frakcjonowanie Wybranych Metali Ciężkich W Glebach Uprawnych

2013 ◽  
Vol 20 (1) ◽  
pp. 117-125 ◽  
Author(s):  
Szymon Różański
Keyword(s):  
Organic Matter ◽  
Significant Role ◽  
Manganese Oxides ◽  
Solid Phase ◽  
Extraction Procedure ◽  
Total Content ◽  
Residual Fraction ◽  
Geochemical Background ◽  
Fraction Bound ◽  
Iron And Manganese

Abstract The content of trace elements in soils varies widely and their mobility and availability depends not only on the total content but also on the form of in which these elements occur. The aim of this study was to determine the total content of nickel, lead, zinc and copper in soils used for agriculture, and assess the mobility and phytoavailability of these metals against a background of physical and chemical properties of these soils. In samples taken from three soil profiles (Phaeozem and 2 Fluvisols) the contents of Ni, Pb, Zn and Cu were determined using atomic absorption spectroscopy in the solutions obtained according to the protocol of modified BCR sequential extraction procedure supplemented with aqua regia digestion. The total content of the analyzed metals in most cases corresponded to the natural values, often not exceeding the geochemical background level. It was only in the one profile of the Fluvisols (Endogleyic Fluvisol) that a higher concentration of zinc and lead was noticed (especially in the surface horizon), slightly exceeding the legal limit. Among the studied metals the lowest phytoavailability was characterized by copper (exchangeable forms on average 4.73% of the total), and the highest by zinc (11.49%). Nickel was the most permanently bound with soil solid phase, and its content in the residual fraction reached 84.46% of the total. Approximately a half of the total lead content was determined as a fraction bound with iron and manganese oxides, while in the case of this metal a significant role in binding of this metal was playing organic matter (fraction bound with organic matter and sulphides - an average of 27.5%). Significant role in the binding of all investigated metals was credited to iron and manganese compounds.

scholarly journals Effects of soil components, solution chemical properties, and temperature on Cu(II) adsorption by alluvial acid soil: A case study in Southwest China

2021 ◽  
Author(s):  
Bangzheng Ren ◽  
Yong Wu ◽  
Hongtao Li ◽  
Zailin Chen ◽  
Junlong Xu
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Manganese Oxides ◽  
Acid Soil ◽  
Clay Fraction ◽  
Bulk Soil ◽  
Chemical Extraction ◽  
Experimental Conditions ◽  
Selective Chemical ◽  
Soil Components

Abstract The specific soil components such as soil organic matter, Fe and Mn oxides exert a significant influence on Cu(II) adsorption in soil. In the present study, clay fraction was separated from an alluvial acid soil, Then the selective chemical extraction method was used to remove the specific components in the bulk soil and clay fraction. Adsorption experiments showed that the adsorption capacity of the clay fraction of Cu(II) is greater than that of the bulk soil, regardless of whether it is treated by selective chemical extraction or not. Compared with untreated soil samples, after the removal of organic matter by H2O2, Kd decreased by a maximum of 82.8% for the bulk soil and 73.5% for the clay fraction. After the removal of manganese oxides by NH2OH·HCl, Kd decreased by a maximum of 68.1% for the bulk soil and 73.2% for the clay fraction. However, after the removal of free iron oxides by dithionite-citrate-bicarbonate, Kd increased by a maximum of 422% for the bulk soil and 195.5% for the clay fraction. Kd increased by 4263.3% when the initial pH increased from 2 to 3.5 and, then, increased to 6. The amount of Cu(II) adsorbed did not change significantly. Within a range greater than 6, the increased Cu(II) adsorption may be due to the precipitation of Cu(II). When the concentration of NaNO3 changes from 0.01 to 0.1 M, the adsorption capacity decreased by a maximum of 36%, Kd decreased by a maximum of 84.3%. The presence of foreign ions decreased Cu(II) adsorption; their order of effect on Cu(II) adsorption is Na+ < K+ < Mg2+ < Ca2+ for cations and NO3− < SO42− ≈ Cl− for anions. The adsorption of Cu(II) was an endothermic and spontaneous process under the experimental conditions.

Adsorption of cadmium by an aquent New Zealand soil and Its components

Soil Research ◽  
1992 ◽  
Vol 30 (2) ◽  
pp. 159 ◽  
Author(s):  
ND Kim ◽  
JE Fergusson
Keyword(s):  
Particle Size ◽  
New Zealand ◽  
Manganese Oxides ◽  
Equilibrium Constants ◽  
Size Fraction ◽  
Silica Sand ◽  
Particle Size Fraction ◽  
Adsorption Sites ◽  
Cadmium Adsorption ◽  
Iron And Manganese

Cadmium adsorption by a New Zealand soil, three of its particle size fractions, the soil with organic matter removed, and the soil with iron and manganese oxides removed, was studied at the soil's natural pH (5.70) and at cadmium concentrations (0.01 to 0.23 �g mL-1) typical of those found in the environment. Under these conditions, the whole soil had a strong affinity for trace amounts of cadmium, adsorbing about nine-tenths of that added. Relative conditional equilibrium constants for cadmium adsorption by the soil's components decrease in the following order: clay (1.59) > [whole soil (1.00)] > soil without iron and manganese oxides (0.55) > silt (0.54) > sand (0.52) > soil without organic material (0.08) > silica sand (0.001). It is estimated that the <3.9 �m particle size fraction (22% of the soil) and the 3-9-563 pm particle size fraction (78% of the soil), contributed about 45% and 55%, respectively, to the overall capacity of the soil to adsorb cadmium. Most data obtained gives good fits to both linear and Freundlich adsorption isotherms, but is not consistent with the Langmuir adsorption model. Thus it is likely that, under the conditions studied, the soil and its components supply a range of cadmium adsorption sites with varying adsorption energies.

scholarly journals Effects of long-term green manure application on the content and structure of dissolved organic matter in red paddy soil

2018 ◽  
Vol 17 (8) ◽  
pp. 1852-1860 ◽  
Author(s):  
Song-juan GAO ◽  
Ju-sheng GAO ◽  
Wei-dong CAO ◽  
Chun-qin ZOU ◽  
Jing HUANG ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Paddy Soil ◽  
Green Manure ◽  
Manure Application ◽  
Red Paddy Soil

scholarly journals Effect of Digestate and Straw Combined Application on Maintaining Rice Production and Paddy Environment

2021 ◽  
Vol 18 (11) ◽  
pp. 5714
Author(s):  
Xue Hu ◽  
Hongyi Liu ◽  
Chengyu Xu ◽  
Xiaomin Huang ◽  
Min Jiang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Water ◽  
Soil Organic Matter ◽  
Paddy Soil ◽  
Rice Yield ◽  
Soil Surface ◽  
Rice Production ◽  
Straw Decomposition ◽  
Rice Grains ◽  
Combined Application

Few studies have focused on the combined application of digestate and straw and its feasibility in rice production. Therefore, we conducted a two-year field experiment, including six treatments: without nutrients and straw (Control), digestate (D), digestate + fertilizer (DF), digestate + straw (DS), digestate + fertilizer + straw (DFS) and conventional fertilizer + straw (CS), to clarify the responses of rice growth and paddy soil nutrients to different straw and fertilizer combinations. Our results showed that digestate and straw combined application (i.e., treatment DFS) increased rice yield by 2.71 t ha−1 compared with the Control, and digestate combined with straw addition could distribute more nitrogen (N) to rice grains. Our results also showed that the straw decomposition rate at 0 cm depth under DS was 5% to 102% higher than that under CS. Activities of catalase, urease, sucrase and phosphatase at maturity under DS were all higher than that under both Control and CS. In addition, soil organic matter (SOM) and total nitrogen (TN) under DS and DFS were 20~26% and 11~12% higher than that under B and DF respectively, suggesting straw addition could benefit paddy soil quality. Moreover, coupling straw and digestate would contribute to decrease the N content in soil surface water. Overall, our results demonstrated that digestate and straw combined application could maintain rice production and have potential positive paddy environmental effects.

scholarly journals Nutrient and Stoichiometric Characteristics of Aggregates in a Sloping Farmland Area under Different Tillage Practices

2021 ◽  
Vol 13 (2) ◽  
pp. 890
Author(s):  
Jie Zhang ◽  
Yaojun Liu ◽  
Taihui Zheng ◽  
Xiaomin Zhao ◽  
Hongguang Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Size Distribution ◽  
Soil Aggregates ◽  
Soil Aggregate ◽  
Elemental Content ◽  
Stoichiometric Ratio ◽  
Longitudinal Ridge ◽  
Stoichiometric Ratios ◽  
Sloping Farmland ◽  
Ridge Tillage

Sloping farmland is prevalent in hilly red soil areas of South China. Improper tillage patterns induce decreased soil organic matter, soil aggregate breakdown, and nutrient imbalance, thereby restricting crop production. However, the stoichiometric characteristics could reflect the nutrient availability which was mostly studied on bulk soil. The stoichiometric characteristics of soil aggregates with multiple functions in farmlands has rarely been studied. The study was to reveal the impact of tillage patterns on the size distribution, nutrient levels, and stoichiometric ratios of soil aggregates after 20 years’ cultivation. Soil samples of 0–20 cm and 20–40 cm from five tillage patterns, bare-land control (BL), longitudinal-ridge tillage (LR), conventional tillage + straw mulching (CS), cross-ridge tillage (CR), and longitudinal-ridge tillage + hedgerows (LH) were collected. The elemental content (C, N and P) and soil aggregate size distribution were determined, and the stoichiometric ratios were subsequently calculated. Through our analysis and study, it was found that the nutrient content of >2 mm soil aggregates in all plots was the highest. In the hedgerow plots, >2 mm water-stable soil aggregate content was increased. Therefore, LH plots have the highest content of organic matter and nutrients. After 20 years of cultivation, stoichiometric ratio of each plot showed different changes on soil aggregates at different levels. the C:N, C:P, and N:P ratios are lower than the national average of cultivated land. Among of them, the stoichiometric ratio in the LH plot is closer to the mean and showed better water-stable aggregate enhancement. Therefore, longitudinal-ridge tillage + hedgerows can be recommended as a cultivation measure. This study provides a reference for determining appropriate tillage measures, balancing nutrient ratios, and implementing rational fertilization.

Sign in / Sign up

Export Citation Format

Share Document