scholarly journals The adsorption and mechanism of the nitrification inhibitor nitrapyrin in different types of soils

2020 ◽  
Vol 7 (9) ◽  
pp. 200259 ◽  
Author(s):  
Zhongqing Zhang ◽  
Qiang Gao ◽  
Jingmin Yang ◽  
Yue Li ◽  
Jinhua Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Adsorption Kinetics ◽  
Physical Adsorption ◽  
Nitrification Inhibitor ◽  
Black Soil ◽  
Order Kinetic ◽  
Different Types ◽  
Isotherm Adsorption ◽  
Adsorption Kinetics And Isotherm

The nitrapyrin was easily adsorbed by soil, but most current studies have focused on comparing the effects of nitrapyrin application at different soil organic matter levels and in different soil types. The adsorption kinetics and isotherm adsorption of the nitrification inhibitor nitrapyrin in black soil, chernozem and planosol were studied in this paper. The adsorption kinetics were fitted by quasi-second-order kinetic equation ( R 2 ≥ 0.8907, p < 0.05) with a lower acting energy of adsorption ( E a < 8.0 kJ mol −1 ). The isotherm was fitted by the Langmuir equation ( R 2 ≥ 0.9400 * , p < 0.05). The adsorption mechanism was determined to involve a spontaneous endothermic reaction accompanied mainly by physical adsorption to the surface that belonged to the ‘ L ’ isotherm curve ( n > 1). Temperature promoted the adsorption of nitrapyrin in these three soils, and the maximum adsorption occurring at different temperatures following the order of black soil > planosol > chernozem. The adsorption capacity and rate decreased with decreasing soil organic matter. For the black soil, the nitrapyrin EC adsorption rate was more than seven times higher than that of nitrapyrin CS. The result would determine the dose of nitrapyrin required for availability in different types of soils and to provide a theoretical basis for elucidating the adsorption of nitrapyrin in the soil environment.

Effect of Soil Organic Matter on Adsorption of Nitrification Inhibitor Nitrapyrin in Black Soil

2020 ◽  
Vol 51 (7) ◽  
pp. 883-895
Author(s):  
Zhongqing Zhang ◽  
Qiang Gao ◽  
Jingmin Yang ◽  
Lujun Li ◽  
Yue Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Nitrification Inhibitor ◽  
Black Soil

scholarly journals Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 114-123
Author(s):  
Zhongqing Zhang ◽  
Qiang Gao ◽  
Zhonglei Xie ◽  
Jingmin Yang ◽  
Jinhua Liu
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Soil Organic Matter ◽  
Fulvic Acid ◽  
Nitrification Inhibitor ◽  
Black Soil ◽  
Soil Characteristics ◽  
High Organic Matter

The compound nitrapyrin is easily adsorbed by soil organic matter in high-organic matter soils, and this results in its effectiveness reducing significantly.

Adsorption kinetics and isotherm of vanadium with melamine

2017 ◽  
Vol 75 (10) ◽  
pp. 2316-2321 ◽  
Author(s):  
Hao Peng ◽  
Zuohua Liu ◽  
Changyuan Tao
Keyword(s):  
Adsorption Kinetics ◽  
Impact Factors ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Adsorption Kinetics And Isotherm ◽  
Langmuir And Freundlich Models

Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428.57 mg vanadium/g melamine, and the Freundlich model showed the adsorption is privilege type.

scholarly journals Exploring Appropriate Preprocessing Techniques for Hyperspectral Soil Organic Matter Content Estimation in Black Soil Area

2020 ◽  
Vol 12 (22) ◽  
pp. 3765
Author(s):  
Xitong Xu ◽  
Shengbo Chen ◽  
Zhengyuan Xu ◽  
Yan Yu ◽  
Sen Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Dimensionality Reduction ◽  
Near Infrared ◽  
Organic Matter Content ◽  
Nir Spectroscopy ◽  
Data Transformation ◽  
Black Soil ◽  
Locally Linear Embedding ◽  
Soil Area

Black soil in northeast China is gradually degraded and soil organic matter (SOM) content decreases at a rate of 0.5% per year because of the long-term cultivation. SOM content can be obtained rapidly by visible and near-infrared (Vis–NIR) spectroscopy. It is critical to select appropriate preprocessing techniques for SOM content estimation through Vis–NIR spectroscopy. This study explored three categories of preprocessing techniques to improve the accuracy of SOM content estimation in black soil area, and a total of 496 ground samples were collected from the typical black soil area at 0–15 cm in Hai Lun City, Heilongjiang Province, northeast of China. Three categories of preprocessing include denoising, data transformation and dimensionality reduction. For denoising, Svitzky-Golay filter (SGF), wavelet packet transform (WPT), multiplicative scatter correction (MSC), and none (N) were applied to spectrum of ground samples. For data transformation, fractional derivatives were allowed to vary from 0 to 2 with an increment of 0.2 at each step. For dimensionality reduction, multidimensional scaling (MDS) and locally linear embedding (LLE) were introduced and compared with principal component analysis (PCA), which was commonly used for dimensionality reduction of soil spectrum. After spectral pretreatments, a total of 132 partial least squares regression (PLSR) models were constructed for SOM content estimation. Results showed that SGF performed better than the other three denoising methods. Low-order derivatives can accentuate spectral features of soil for SOM content estimation; as the order increases from 0.8, the spectrum were more susceptible to spectral noise interferences. In most cases, 0.2–0.8 order derivatives exhibited the best estimation performance. Furthermore, PCA yielded the optimal predictability, the mean residual predictive deviation (RPD) and maximum RPD of the models using PCA were 1.79 and 2.60, respectively. The application of appropriate preprocessing techniques could improve the efficiency and accuracy of SOM content estimation, which is important for the protection of ecological and agricultural environment in black soil area.

Adsorption kinetics and thermodynamics of hydrophobic natural organic matter (NOM) removal from aqueous solution by multi-wall carbon nanotubes

2013 ◽  
Vol 13 (2) ◽  
pp. 273-285 ◽  
Author(s):  
A. Naghizadeh ◽  
S. Nasseri ◽  
A. M. Rashidi ◽  
R. Rezaei Kalantary ◽  
R. Nabizadeh ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Adsorption Kinetics ◽  
Chemical Vapor ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Operational Conditions ◽  
Multi Wall Carbon Nanotubes

The objective of this research was to study the efficiency of Multi-Walled Carbon Nanotubes (MWCNTs) for the adsorption of hydrophobic natural organic matter (NOM) from aqueous solution under different operational conditions of contact time, pH, initial concentration of NOM and temperature. MWCNTs were synthesized via chemical vapor deposition (CVD) with average diameter of 10–50 nm. The results illustrated that both as-prepared and functionalized MWCNTs showed high adsorption capacity for the NOM studied. Functionalization of MWCNT affected the surface area and introduced oxygen-containing functional groups to the surface of MWCNT which depressed the adsorption of NOM onto MWCNTs-COOH. The obtained data were studied using Freundlich, Langmuir and BET isotherms; NOM adsorption data had the best conformity to the Freundlich isotherm. Kinetic studies were performed and the adsorption kinetics successfully followed the pseudo-second-order kinetic model. Thermodynamic parameters such as free energy change (ΔG°), enthalpy change (ΔH°) and entropy change (ΔS°) were determined and evaluation of them showed that the adsorption process for NOM is general spontaneous, endothermic and thermodynamically favorable.

scholarly journals Effect of Different Types of Fertilizer Application on the Soil Fertility of Oil Palm Reclamation Soil under Polyculture System

2020 ◽  
Vol 11 (2) ◽  
pp. 1-11
Author(s):  
Nur Amalina Mohd Ropi ◽  
Norfakhrina Mohd Noor ◽  
Ong Pei Ying ◽  
Mohd Helmi Nadri ◽  
Nor Zalina Othman ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Fertility ◽  
Bulk Density ◽  
Soil Ph ◽  
Oil Palm ◽  
Fertilizer Application ◽  
Inorganic Fertilizer ◽  
Combine Application ◽  
Different Types

To evaluate the effect of different fertilizer application on soil fertility under polyculture cropping system (okra, water spinach and yard long bean), a field experiment was conducted in the oil palm reclamation soil at the research farm in ICA UTM-Pagoh. There were five treatments involved which were: (T1) no fertilizer, (T2) organic fertilizer, (T3) inorganic fertilizer, (T4) organic inorganic compound fertilizer and (T5) organic + inorganic fertilizer.  The initial and final soil samples were collected to study the effect of different types of commercial fertilizer application on soil pH, electrical conductivity (EC), moisture content, soil organic carbon (SOC), total nitrogen (TN), C/N ratio, soil organic matter (SOM), bulk density and nutrients (P and K) contents in the soil surface layer (0–15 cm) of the experimented site for 14 weeks. Results showed that the soil pH was the lowest with an average of 6.05 units in T5 and was significantly higher in T1 (8.23 units). The EC value in T5 is the highest with 172.4 ds/m and lowest in T1 with an average of 25.5 ds/m. T5 showed the highest soil moisture and soil organic matter with 15.81% and 4.01% respectively. The combine application of organic and inorganic fertilizers has increased SOC and TN values compared with the T1 (control) specifically, which resulted in 3.7% and 0.33% of SOC and TN concentrations, respectively (). Bulk density showed no significant different among all the treatment with the highest value was in T4 (1.22g/cm3) and lowest in T3(1.05g/cm3). The average amounts of C/N ratio ranged from 11.11 to 13.60 between all treatments with the highest ratio in T4 (13.6). The average P and K contents were highest in T5 (1564.7 mg/kg and 1056.2 mg/kg). Thus, it showed that the application with the mixture of organic and inorganic fertilizer (T5) improved the soil condition.

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