Sterilisation of soil without affecting the humic components
TL;DR: In this article, the Arnold method was used to sterilize soil without affecting the nature and quantity of humic components in it, and the results revealed that this method of sterilisation does not affect the humic component present in the soil.
Abstract: In order to overcome the difficulty in sterilising soils without affecting the nature and quantity of humic components in it, the Arnold method of sterilisation has been tried. Humic substances from the sterilised soil samples were compared with their corresponding counterparts from the non-sterilised samples. The data reveal that this method of sterilisation does not affect the humic components present in the soil.
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TL;DR: In this paper, a Freundlich model for chlorophenols at infinite dilution was proposed, which is valid for all investigated soils, including the synthetic "soils", and the increase of non-extractable fractions chlorophenol was described with a square root of time relation.
Abstract: Sorption experiments with 5 chlorophenols were set up with 6 natural soils and 3 synthetic “soils”. A sorption model is described for sorption at infinite dilution, which is valid for all investigated soils, including the synthetic “soils”. A Freundlich sorption model is derived for concentrations in the ppm-range. The Freundlich equations are valid for all investigated soils. The increase of the non-extractable fractions chlorophenol is described with a square root of time relation.
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TL;DR: In this article, it has been observed that smaller and more flexible humic molecules are less susceptible to the said decomposition as compared to larger and more rigid structures, and that such decomposition decreases at higher clay concentrations.
Abstract: Decomposition studies with humic acids (HAs) present in HA-clay complexes revealed that such decomposition decreases at higher clay concentrations. At high clay concentration, moreover, it has also been observed that smaller and more flexible humic molecules are less susceptible to the said decomposition as compared to larger and more rigid structures.
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TL;DR: In this article, it was shown that the ratio of optical densities or absorbances of dilute, aqueous humic and fulvic acid solutions at 465 and 665 nm is mainly governed by the particle size (or particle or molecular weight).
Abstract: The ratio of optical densities or absorbances of dilute, aqueous humic and fulvic acid solutions at 465 and 665 nm (E₄/E₆) is widely used by soil scientists for the characterization of these materials. While it has been suggested that the E₄/E₆ ratio is related to the degree of condensation of the aromatic carbon network, carbon content, and molecular weight of humic substances, little rigorous experimental evidence is available in the literature to confirm these hypotheses. The results of this investigation show that the E₄/E₆ ratio of humic and fulvic acid is: (i) mainly governed by the particle size (or particle or molecular weight); (ii) affected by pH; (iii) correlated with the free radical concentration, contents of O, C, CO₂H and total acidity in as far as these parameters are also functions of the particle size or particle or molecular weight; (iv) apparently not directly related to the relative concentration of condensed aromatic rings; (v) independent of humic acid and fulvic acid concentrations, at least in the 100–500 ppm range. Our data show, in agreement with M. M. Kononova (1966), that E₄/E₆ ratios for humic and fulvic acids should be determined between pH 7 and 8. This can best be done by dissolving the humic material in 0.05N NaHCO₃ solution at concentrations of 200–400 ppm.
994 citations
Book•
01 Jan 1973
TL;DR: The fundamental principles of bacteriology are studied in detail in the context of drug discovery and their applications in medicine and bacteriology.
Abstract: Fundamental principles of bacteriology , Fundamental principles of bacteriology , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
128 citations
82 citations
TL;DR: In this paper, the polyelectrolyte character of four natural and ten synthetic hymatomelanic acids, synthesized from possible monomers both in the presence and absence of catalysts, was established by means of viscosity measurements.
Abstract: The polyelectrolyte character of four natural and ten synthetic hymatomelanic acids, synthesized from possible monomers both in the presence and absence of catalysts, was established by means of viscosity measurements. Intrinsic viscosities were evaluated for the purpose of comparison. The number-average molecular weights of some typical natural and synthetic hymatomelanic acids were determined from osmotic pressure measurements. Using the Flory-Fox relationship in an approximate manner, the root-mean-square average end-to-end separations were also evaluated.
9 citations
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