The Effect of Sequential Removal of Organic Matter on the Surface Morphology of Humin

Malekani, Kalumbu; Rice, James A.; Lin, J. S.

doi:10.1097/00010694-199705000-00003

Cited by 49 publications

(29 citation statements)

References 34 publications

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“…Fründ & Lündemann (1991) had already pointed out the insolubility of organic matter in alkaline solution due to binding or complexation with minerals in the soil. The occurrence of carboxylic groups and of humic acid-like structure in humin has also been reported earlier by other authors (Preston & Ripmeester, 1982;Rice & McCarthy, 1989;Stevenson, 1994;Malekani et al, 1997 not discard the possibility that this organomineral complex could be an artifact from the previous HF treatment.…”

Section: Transmission Ftir Spectroscopysupporting

confidence: 84%

Chemical characterization and infrared spectroscopy of soil organic matter from two southern brazilian soils

Dick

Santos

Ferranti

2003

Rev. Bras. Ciênc. Solo

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SUMMARY Soil organic matter from the surface horizon of two Brazilian soils (a Latosol and a Chernosol), in bulk samples (in situ SOM) and in HF-treated samples (SOM), was characterized by elemental analyses, diffuse reflectance (DRIFT) and transmission Fourier transform infrared spectroscopy (T-FTIR). Humic acids (HA), fulvic acids (FA) and humin (HU) isolated from the SOM were characterized additionally by ultraviolet-visible spectroscopy (UV-VIS). After sample oxidation and alkaline treatment, the DRIFT technique proved to be more informative for the detection of "in situ SOM" and of residual organic matter than T-FTIR. The higher hydrophobicity index (HI) and H/C ratio obtained in the Chernosol samples indicate a stronger aliphatic character of the organic matter in this soil than the Latosol. In the latter, a pronounced HI decrease was observed after the removal of humic substances (HS). The weaker aliphatic character, the higher O/C ratio, and the T-FTIR spectrum obtained for the HU fraction in the Latosol suggest the occurrence of surface coordination of carboxylate ions. The Chernosol HU fraction was also oxygenated to a relatively high extent, but presented a stronger hydrophobic character in comparison with the Latosol HU. These differences in the chemical and functional group composition suggest a higher organic matter protection in the Latosol. After the HF treatment, decreases in the FA proportion and the A 350 /A 550 ratio were observed. A possible loss of FA and condensation of organic molecules due to the highly acid medium should not be neglected.Index terms: hydrophobicity, organo-mineral interactions, HF-treatment, humic substances.(

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Section: Transmission Ftir Spectroscopysupporting

confidence: 84%

Chemical characterization and infrared spectroscopy of soil organic matter from two southern brazilian soils

Dick

Santos

Ferranti

2003

Rev. Bras. Ciênc. Solo

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“…PAHs with higher hydrophobicity have higher affinity to soil organic matter, resulting in their strong sequestration in soil and resistance to desorption, and therefore a smaller available fraction in the soil solution. Furthermore, nano-pores or voids are abundant in the organic fraction of soils (Malekani et al, 1997). PAHs with higher hydrophobicity usually have larger molecular volumes.…”

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confidence: 99%

Predicting bioavailability of PAHs in field-contaminated soils by passive sampling with triolein embedded cellulose acetate membranes

Tao

Zhang

Wang

et al. 2009

Environmental Pollution

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“…Natural organic matter in soils interacts with surfaces of inorganic materials, primarily aluminosilicates or clay minerals, to form a strongly associated organo-mineral composite known as humin. Upon removal of the organic matter from the soils, surface area increased and surface pore size decreased (33). This may account for the slight change in the sorption properties of the Passaic sediments after the organic matter was removed.…”

Section: Discussionmentioning

confidence: 99%

Role of organic matter, clay, and iron contents in the sorption of oxytetracycline on river sediments

Barbooti

2017

Environ Health Eng Manag

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Background: Oxytetracycline (OTC) is a widely-used antibiotic; metabolism studies indicate only partial assimilation of it inside the body. Traditional wastewater treatment plants cannot remove OTC, and this results in the release of considerable amounts of the drug into aquatic environments. There is much concern over the role of residual antibiotics in the development of new generations of bacteria with modified resistance to the antibiotics. The present work investigated the possibility of OTC sorption on river sediments. Methods: Seven sediment samples were collected from various locations and depths of the Passaic River in New Jersey. The texture, clay, extractable iron, and organic matter contents of the sediments were determined. Pyrolysis-gas chromatography-mass spectrometric (Py GC-MS) analysis indicated the presence of 3 categories of organic materials: petroleum hydrocarbons, anthropogenic, and plant residual materials. The sediment samples were equilibrated with OTC solutions for 24 hours followed by centrifugation and syringe filtration. The residual OTC contents were determined by high performance liquid chromatography. Results: It appeared that 35%-60% fractions of OTC were retained by the sediments. The sorption capacity values of the sediments were correlated with clay content, organic matter content, and available iron. A poor correlation was found between adsorption capacity and clay content in the presence of organic matter and iron. Meanwhile, a relatively strong correlation was found between adsorption capacity with the iron, R 2 = 0.7499, and organic matter contents of the sediments, R 2 = 0.7899. Thus, the sorption of OTC on sediments is governed by all constituents. Conclusion: It was concluded that the antibiotic-sediment interaction is controlled mainly by the organic matter and iron contents. Keywords: Oxytetracycline, sorption, Passaic River sediment, Organic matter, Pyrolysis gas chromatographymass spectrometry, Py GC-MS Citation: Barbooti MM. Role of organic matter, clay, and iron contents in the sorption of oxytetracycline on river sediments.

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The Effect of Sequential Removal of Organic Matter on the Surface Morphology of Humin

Cited by 49 publications

References 34 publications

Chemical characterization and infrared spectroscopy of soil organic matter from two southern brazilian soils

Chemical characterization and infrared spectroscopy of soil organic matter from two southern brazilian soils

Predicting bioavailability of PAHs in field-contaminated soils by passive sampling with triolein embedded cellulose acetate membranes

Role of organic matter, clay, and iron contents in the sorption of oxytetracycline on river sediments

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