Zinc sorption by different soils as affected by selective removal of carbonates and hydrous oxides

The adsorption characteristics of tetracycline by 2 soils including a clay-rich soil (cinnamon soil) and an iron oxide-rich soil (red soil) were investigated as a function of soil organic matter (SOM). SOM is the main adsorbent for tetracycline in the soil environment. The results indicated that the adsorption kinetics of tetracycline by the different soils with or without organic matter was described by the Elovich equation and the exponent equation. The adsorption of tetracycline on red soil was quite rapid and equilibrium could be reached after 5 h. In contrast, the concentration of tetracycline in cinnamon soil reached equilibrium after 11 h. The difference in equilibrium time in cinnamon soil and red soil was caused by their dominant components for adsorption, including clays, organic matter, and Al/Fe hydrous oxides. It took longer for the penetration of tetracycline into the interlayers between clays and organic matter in cinnamon soil, but tetracycline needed less time for adsorption through surface complexation on oxide surfaces of red soil. Removing SOM from soil markedly shortened the equilibrium time (7 h) of adsorption and reduced the equilibrium concentration (Cs) in cinnamon soil, but not in red soil, because of different dominant components for adsorption in the 2 natural soils. In natural and SOM-free soils, >98% of tetracycline in solution could be sorbed. The adsorption of tetracycline on natural and SOM-free soils was well described by Freundlich adsorption isotherms. Batch adsorption experiments showed that the adsorption of tetracycline on natural red soil was stronger than that on natural cinnamon soil. Adsorption capacity (KF) decreased with an increase in SOM removed from soil, which is attributed to the effect of tetracycline sorbed by SOM in different soils. However, SOM affected the adsorption intensity (n) of different soils diversely; there was a decrease for red soil and an increase for cinnamon soil. In particular, red soil with high Al/Fe hydrous oxides had higher adsorption affinities than cinnamon soil.

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Sorption–desorption of Sb(III) in different soils: Kinetics and effects of the selective removal of hydroxides, organic matter, and humic substances

Chemosphere ◽

10.1016/j.chemosphere.2018.04.067 ◽

2018 ◽

Vol 204 ◽

pp. 371-377 ◽

Cited By ~ 11

Author(s):

Jining Li ◽

Hong Hou ◽

Masaaki Hosomi

Keyword(s):

Organic Matter ◽

Humic Substances ◽

Selective Removal ◽

Different Soils

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Improving method reliability through selective removal of glycerolipid and chlorophyll interferences

Planta Medica ◽

10.1055/s-0033-1352079 ◽

2013 ◽

Vol 79 (13) ◽

Author(s):

S Bijttebier ◽

E D'Hondt ◽

S Apers ◽

N Hermans ◽

S Voorspoels

Keyword(s):

Selective Removal

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Hydrous oxides and their cation-exchange properties

Journal of Biochemical Toxicology ◽

10.1002/jbt.2570151001 ◽

1965 ◽

Vol 15 (10) ◽

pp. 445-448 ◽

Cited By ~ 1

Author(s):

C. Heitner-Wirguin ◽

A. Albu-Yaron

Keyword(s):

Cation Exchange ◽

Hydrous Oxides ◽

Exchange Properties

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Water soluble nitrogen forms on two different soils as affected by biofertilization

Cereal Research Communications ◽

10.1556/crc.35.2007.2.108 ◽

2007 ◽

Vol 35 (2) ◽

pp. 597-600

Author(s):

Ida Kincses ◽

Tibor Filep ◽

Péter Nagy ◽

Andrea Kovács

Keyword(s):

Water Soluble ◽

Soluble Nitrogen ◽

Nitrogen Forms ◽

Different Soils

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Energetic comparison of some stump-removing methods

Progress in Agricultural Engineering Sciences ◽

10.1556/progress.10.2014.3 ◽

2014 ◽

Vol 10 (1) ◽

pp. 35-51

Author(s):

I. Czupy

Keyword(s):

Alternative Energy ◽

Fossil Fuel ◽

Alternating Current ◽

Above Ground Biomass ◽

Alternative Energy Sources ◽

Wide Domain ◽

Fuel Substitution ◽

Unused Resource ◽

Root Connection ◽

Different Soils

Concerns about climate change and fossil fuel shortages are encouraging interest in stumps, as alternative energy sources. Stumps are an almost unused resource in the context of bio fuels. Stump harvesting signifies an intensification of forest management compared with conventional stem-only or above-ground biomass-only harvesting. There are many benefits of stump harvesting. These include: the production of wood fuel, fossil fuel substitution, and improved soil preparation.Removing tree trunks in Hungary has been going on according to the principle of stump extraction, which means stumps are removed by grabbing technology. Experiments have been carried out to reduce the extraction force. In the Great Hungarian Lowland, where large areas require the operation implementation, stump extraction is done by special, hydraulic driven baggers equipped with a special bucket. During operation of the equipment, we carried out measurements of the extraction force and the time requirement. The experiments are designed to carry out the measurements with different soils and different tree species. According to our proposal the suitable force and torque required to remove stumps can be significantly reduced if before the lifting the soil — root connection is loosened. One of the possible ways to implement this task is the use of vibration. Since relatively great vibration power and wide domain of frequency are necessary, therefore we prepared the loosening machinery elements of alternating-current hydraulics system. Based on constructions variants we created a tractor-mounted experimental alternating-current hydraulic stump-loosening machine. It was designed with the ability to produce horizontal vibration in order to loosen stumps.

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