scholarly journals Sorption of Sulfonamide Antibiotics to Soil Organic Sorbents: Batch Experiments with Model Compounds and Computational Chemistry

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
J. Schwarz ◽  
S. Thiele-Bruhn ◽  
K.-U. Eckhardt ◽  
H.-R. Schulten
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Diffusion Processes ◽  
Specific Binding ◽  
Complex Structure ◽  
Sorption Behavior ◽  
Batch Experiments ◽  
Sulfonamide Antibiotics ◽  
Model Soil ◽  
Intra Particle Diffusion

Sorption of the sulfonamide antibiotics sulfanilamide, sulfadimethoxine, and sulfapyridine to model soil organic matter was investigated. Therefore, Fluka humic acid and an enzymatically reacted vanillin oligomer were used in batch experiments at pH 4.5, 6.0, and 7.5. Sorption of the amphoteric sulfonamides was nonlinear and pH dependent. At pH 4.5 and 6.0 sorption to both humic acid and oligomer increased in the order sulfanilamide < sulfapyridine < sulfadimethoxine. This was primarily attributed to the sulfonamides' H-bond donor/acceptor properties. Sorption to the oligomer indicated that in addition to π-π interactions with aromatics phenolic, aldehyde and methoxyl moieties of the oligomer are specific binding sites. Stronger sorption to humic acid than to the oligomer was related to the more complex structure and functional group diversity of humic acid. At pH 7.5 sorption sequence was changed to sulfadimethoxine < sulfanilamide < sulfapyridine, indicating a changed sorption behavior due to different sulfonamide speciation. In part sorption non-reversibility was strong. This was attributed to surface complexation, rate-limiting intra-particle diffusion processes and entrapment of sulfonamides in voids of organic matter. Molecular mechanics (MM+) computational modeling using a DOM-trimer model confirmed that H-bonding and dipole-dipole interactions are crucial for entrapment of sulfonamides in voids of organic matter.

Sorption behavior of tylosin and sulfamethazine on humic acid: kinetic and thermodynamic studies

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58865-58872 ◽  
Author(s):  
Xuetao Guo ◽  
Jianhua Ge ◽  
Chen Yang ◽  
Renren Wu ◽  
Zhi Dang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Sorption Behavior ◽  
Thermodynamic Studies ◽  
P Sorption ◽  
Kinetic And Thermodynamic Studies

Sorption and transport of TYL and SMT in soils is complicated and the transportation abilities of TYL and SMT might be weak for the soils rich in organic matter.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Characteristics of fouling due to clay-organic substances in potable water treatment by ultrafiltration

1996 ◽  
Vol 34 (9) ◽  
pp. 157-164 ◽  
Author(s):  
Kim C.-H. ◽  
M. Hosomi ◽  
A. Murakami ◽  
M. Okada
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Humic Acid ◽  
Fulvic Acid ◽  
Size Distribution ◽  
Ultrafiltration Membrane ◽  
Organic Substances ◽  
Decomposition Products ◽  
Microbial Decomposition ◽  
Fouling Materials

Effects of clay on fouling due to organic substances and clay were evaluated by model fouling materials and kaolin. Model fouling materials selected were protein, polysaccharide, fulvic acid, humic acid and algogenic matter (EOM:ectracellular organic matter, microbial decomposition products) and kaolin was selected as the clay material. Polysulfone membrane (MWCO(Molecular Weight Cut-Off) 10,000, 50,000 and 200,000) was used as an ultrafiltration membrane. In particular, the flux measurement of solutions containing algogenic matter used an ultrafiltration membrane of MWCO 50,000. The flux of protein and polysaccharide with coexistence of kaolin increased in the case of the ratio of MW/MWCO being greater than one, but did not increase in the case of the MW/MWCO ratio being below one. In contrast, the flux of fulvic acid and humic acid with coextence of kaolin decreased regardless of the ratio of MW/MWCO. The addition of dispersion agent and coagulant in the organic substances and kaolin mixture solution changed the size distribution of kaolin, and resulted in a change of the flux. EOM and microbial decomposition products decreased with the increase of the fraction of organic matter having molecular weight more than MWCO of membrane. The flux of the algogenic organic matter with coexistence of kaolin decreased with the increase of the amount of kaolin. It was suggested that the decline of the flux with coexistence of kaolin was due to the change of the resistance of the kaolin cake layer corresponding to the change in kaolin size distribution with charge.

Effects of Natural Organic Matter on TCE Removal in Groundwater by Zero-Valent Iron: Batch Study

2013 ◽  
Vol 807-809 ◽  
pp. 486-489
Author(s):  
Tong Zhou Liu ◽  
Pin Hua Rao
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Early Stage ◽  
Organic Contaminant ◽  
Zero Valent Iron ◽  
Contaminant Removal ◽  
Inhibitory Effects ◽  
Batch Study

An investigation on the effects of humic acid (representing NOM) on TCE (a typical organic contaminant) removal by Fe0in batch settings was carried out. Inhibitory effects of humic acid on Fe0towards TCE removal were observed. At early stage of the experiments, humic acid might partition with TCE, and the adsorption or deposition of humic acid onto Fe0surface would further facilitated TCE immobilization. Once the reduction reactive sites on Fe0surfaces were covered by accumulated humic acid and the partition of TCE to humic acid became saturated, TCE removal in Fe0was observed retarded.

scholarly journals Molecular characterization of an end-residue of humeomics applied to a soil humic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23658-23665 ◽  
Author(s):  
A. Nebbioso ◽  
A. Piccolo ◽  
M. Lamshöft ◽  
M. Spiteller
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Molecular Characterization ◽  
Natural Organic Matter ◽  
Molecular Composition ◽  
Chemical Fractionation ◽  
Soil Humic Acid

Humeomics encompasses step-wise chemical fractionation and instrumental determination to fully characterize the heterogeneous molecular composition of natural organic matter.

Isolation and Sorption Behavior of Humic Acid from Zhongdian Peat of Yunnan Province, China

Pedosphere ◽  
2009 ◽  
Vol 19 (5) ◽  
pp. 606-614 ◽  
Author(s):  
Ping NING ◽  
Hong-Bin WANG ◽  
Bo PAN ◽  
H.-J. BART ◽  
Min YANG
Keyword(s):  
Humic Acid ◽  
Yunnan Province ◽  
Sorption Behavior

Soil Augmentation by Humus: Replenishing lost soils and supplementing new ones

2021 ◽  
Author(s):  
Hemlata Bagla ◽  
Asma Khan
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Plant Growth ◽  
Humic Substances ◽  
Soil Degradation ◽  
Lunar Regolith ◽  
Radioactive Waste Disposal ◽  
Saline Stress ◽  
Plant Metabolites ◽  
Growth Phenomenon

&lt;p&gt;Earth&amp;#8217;s regolith consists of a vital component that is lacking on other planets &amp;#173;&amp;#173;&amp;#8211; the pedosphere or soil body &amp;#8211; that is rich in organic matter, soil fauna, minerals, water, gases, that together support life and is thus essential for plant growth. In stark contrast to our blue planet, Martian regolith is devoid of organic matter and contains crushed volcanic rocks, with high mineral content and toxic chemicals like perchlorates. Nevertheless, Martian and Lunar regolith simulants formulated by NASA, have been experimented for crop growth by addition of organic matter suitable to bind xenobiotics and provide ample nutrients, as an essential step towards expanding our horizon in the extensive field of soil sciences.&lt;/p&gt;&lt;p&gt;Soil is an ecosystem as a whole and acts as a modifier of planet Earth&amp;#8217;s atmosphere. The organic matter present in it originates mainly from plant metabolites with the onset of senescence and humification. Humic substances thus formed in the pedosphere exhibit exceptional characteristics for soil conditioning. Besides providing nutrients and aeration to the soil, they interact and bind with toxic heavy metals, radionuclides, pesticides, industrial dyes, and other xenobiotics that may be present as pollutants in the ecosystem, thus acting as natural sieves. As top soils have maximum organic matter, essential for plant growth, phenomenon like soil erosion leave the soils devoid of humic substances. Another major reason for soil degradation is excessive salinity, leading to osmotic and ionic stress in plants, eventually reducing their growth. Addition of humic acid in soils provides protection against high saline stress and minimizes yield losses. In India, one of the leading agrarian countries, it is a common practice to enrich soils with manure, which is an inexpensive form of humus-boost for the crops. Such practices aid the cyclic flow of organic matter in the environment, against the background of widespread soil degradation.&lt;/p&gt;&lt;p&gt;Another global form of soil degradation is radioactive contamination of soils which occurs mainly due to nuclear accidents and improper practices of radioactive waste disposal. In order to explore such interactions with humic acid following Green technique, batch biosorption studies were performed over a range of parameters, with radionuclides Cs and Sr that are found in low level radioactive wastes. Biosorption percentages of 91&amp;#177;2% and 84&amp;#177;1% were obtained for Cs and Sr respectively. The technique is chemical-free and emphasizes the &amp;#8216;nature for nature&amp;#8217; outlook of solving environmental problems. Humic acid and its various forms thus act as traps for radionuclides and work as excellent restorative soil stimulants that supplement depleted soils, boost plant growth, and play a vital role in sustaining life on Earth.&lt;/p&gt;

scholarly journals Simulating microbial degradation of organic matter in a simple porous system using the 3-D diffusion-based model MOSAIC

2014 ◽  
Vol 11 (8) ◽  
pp. 2201-2209 ◽  
Author(s):  
O. Monga ◽  
P. Garnier ◽  
V. Pot ◽  
E. Coucheney ◽  
N. Nunan ◽  
...  
Keyword(s):  
Experimental Data ◽  
Organic Matter ◽  
Water Content ◽  
Microbial Degradation ◽  
Diffusion Processes ◽  
Pore Space ◽  
High Water Content ◽  
Porous System ◽  
Micro Computed Tomography ◽  
Bacterial Strains

Abstract. This paper deals with the simulation of microbial degradation of organic matter in soil within the pore space at a microscopic scale. Pore space was analysed with micro-computed tomography and described using a sphere network coming from a geometrical modelling algorithm. The biological model was improved regarding previous work in order to include the transformation of dissolved organic compounds and diffusion processes. We tested our model using experimental results of a simple substrate decomposition experiment (fructose) within a simple medium (sand) in the presence of different bacterial strains. Separate incubations were carried out in microcosms using five different bacterial communities at two different water potentials of −10 and −100 cm of water. We calibrated the biological parameters by means of experimental data obtained at high water content, and we tested the model without changing any parameters at low water content. Same as for the experimental data, our simulation results showed that the decrease in water content caused a decrease of mineralization rate. The model was able to simulate the decrease of connectivity between substrate and microorganism due the decrease of water content.

scholarly journals Mobilisation of Al, Fe, and DOM from topsoil during simulated early Podzol development and subsequent DOM adsorption on model minerals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Agnes Krettek ◽  
Thilo Rennert
Keyword(s):  
Organic Matter ◽  
Acetic Acid ◽  
Dissolved Organic Matter ◽  
Flow Velocity ◽  
Heavy Rain ◽  
Oxide Phase ◽  
Batch Experiments ◽  
Important Species ◽  
Velocity Characteristic ◽  
Soil Percolation

AbstractPodzols are characterised by mobilisation of metals, particularly Al and Fe, and dissolved organic matter (DOM) in topsoil horizons, and by immobilisation in subsoil horizons. We mimicked element mobilisation during early podzolisation by irrigating the AE horizon of a Dystric Arenosol with acetic acid at different flow velocities and applying flow interruptions to study rate-limited release in experiments with soil cylinders. We used eluates in batch experiments with goethite and Al-saturated montmorillonite to investigate DOM reactivity towards minerals. Both the flow velocity and flow interruptions affected element release, pointing to chemical non-equilibrium of release and to particles, containing Fe and OM mobilised at larger flow velocity, characteristic of heavy rain or snowmelt. Based on chemical extractions, the source of mobilised Al and Fe, the vast majority of which was complexed by DOM, was no oxide phase, but rather organic. Rate limitation also affected the composition of DOM released. Carboxyl and phenolic species were the most important species adsorbed by both minerals. However, DOM composition affected the extent of DOM adsorption on goethite more distinctly than that on montmorillonite. Our findings evidence that the intensity of soil percolation affects quantitative and qualitative element release during early podzolisation and adsorptive DOM retention in subsoil horizons.

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