Mechanochemical modification of the structure of brown coal humic acids for preparing a sorbent for heavy metals

The influence of fertilization with brown coal (used as preparation called Rekulter) on properties of humic acids extracted from haplic luvisol was studied. Characteristics of humic acids were identified by their elemental composition, thermal decomposition, and infrared and UV-VIS spectra. It was found that humic acids formed during decomposition process of Rekulter in soil were characterised by a higher content of carbon (38.6% versus 35.4%), a lower content of nitrogen (1.50% versus 2.73%) and a higher resistance to thermal decomposition, when compared with humic acids extracted from soils without Rekulter application. Due to special properties of Rekulter, additional liming did not affect the properties of humic acids.

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Electron paramagnetic resonance (EPR) studies on stable and transient radicals in humic acids from compost, soil, peat and brown coal

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/s1386-1425(99)00249-8 ◽

2000 ◽

Vol 56 (2) ◽

pp. 379-385 ◽

Cited By ~ 60

Author(s):

Adam Jezierski ◽

Franciszek Czechowski ◽

Maria Jerzykiewicz ◽

Yona Chen ◽

Jerzy Drozd

Keyword(s):

Electron Paramagnetic Resonance ◽

Humic Acids ◽

Brown Coal ◽

Paramagnetic Resonance ◽

Electron Paramagnetic ◽

Compost Soil

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Interactive toxic effects of heavy metals and humic acids on Vibrio fischeri

Ecotoxicology and Environmental Safety ◽

10.1016/j.ecoenv.2005.04.005 ◽

2006 ◽

Vol 63 (1) ◽

pp. 158-167 ◽

Cited By ~ 87

Author(s):

V. Tsiridis ◽

M. Petala ◽

P. Samaras ◽

S. Hadjispyrou ◽

G. Sakellaropoulos ◽

...

Keyword(s):

Heavy Metals ◽

Humic Acids ◽

Vibrio Fischeri ◽

Toxic Effects

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X-ray Fluorescence Determination of Heavy Metals in Humic Acids

Journal of Analytical Chemistry ◽

10.1023/b:janc.0000047009.01907.14 ◽

2004 ◽

Vol 59 (11) ◽

pp. 1066-1072 ◽

Cited By ~ 1

Author(s):

A. N. Smagunova ◽

U. V. Ondar ◽

E. I. Molchanova ◽

H. V. Vashukevich ◽

V. A. Kozlov ◽

...

Keyword(s):

Heavy Metals ◽

Humic Acids ◽

X Ray ◽

Fluorescence Determination

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Especiación de metales pesados en la fracción disuelta de las aguas superficiales de la cuenca baja y la pluma del Río Manzanares, Estado Sucre, Venezuela

10.31219/osf.io/b3gjx ◽

2016 ◽

Author(s):

Gregorio Martínez ◽

William James Senior ◽

Arístide Márquez

Keyword(s):

Heavy Metals ◽

Surface Water ◽

Humic Acids ◽

Water Mass ◽

The State ◽

Metal Concentrations ◽

Hydrated Form ◽

Anthropogenic Contributions ◽

Del Rio ◽

Dissolved Phase

This paper reports on the speciation of heavy metals (Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn) in the surface water dissolvedfraction of the low basin and plume of the Manzanares River, in the state of Sucre, Venezuela, based on data taken at 22 stationsfrom July 1996 to June 1997. The total metal concentrations in the dissolved phase ranged from below detection levels to 0.01,0.02, 0.02, 0.10, 0.10, 1.03, 2.56, and 5.13 μmol L–1 for Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn, respectively. Overall, the metalsstudied revealed a nonconservative behavior with removal at low salinities, likely due to anthropogenic contributions and toflocculation on account of Fe- and Mn-oxyhydroxide formation resulting from the shifts in pH and ion forces that ensue whenthe fresh waters of the river meet the marine water mass of the Gulf of Cariaco. The heavy metals in the dissolved fraction, inboth free and hydrated form, had a composition in which the largest proportions were associated with humic acids, thus beingmore readily available to organisms.

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